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Analyses of pollen and foraminifera from surface sediments in Pocomoke Sound suggest that neither the upstream forested wetlands nor coastal marshes bordering the sound have contributed appreciably to particulate matter in the 10- to 1000-micron size range that is currently being deposited in the sound. \r\n\r\nSediment processes derived from short-lived isotope. Analyses of beryllium-7, cesium-137 and lead-210 and redox sensitive elements from Pocomoke sediments showed that there has been a significant increase in anthropogenic elements since the late 1940's when the Delmarva Peninsula became more accessible from the Baltimore-Washington region. Cesium-137 was found to be a useful tool to determine changes in sedimentation within the system. Three major stages of sedimentation occurred. Before 1950, the system was equilibrium with the agriculture activity in the watershed, whereas urbanization and agricultural activity changes during and immediately preceding World War II resulted in increased sediment flux. Around 1970, the sediment flux diminished and there was an apparent increase in bank erosion sediment to the deeper parts of the system. \r\n\r\nRates of sediment deposition. Radiocarbon, lead-210, and pollen dating of sediment cores from Pocomoke Sound indicate relatively continuous deposition of fine-grained sediments in the main Pocomoke channel at > ~7 m water depths. Mean sediment accumulation rates during the past few centuries were relatively high (>1 cm yr -1 ). The ages of coarser-grained sediments (sands) blanketing the shallow (< ~ 7 m water depth) flanks of Pocomoke Sound are not well constrained but were probably deposited discontinuously. \r\n\r\nImpacts of land-use on benthic biota. The Pocomoke Sound paleoecological record shows that in the 1940-50s and again in the 1970-80s, the sound experienced unprecedented changes in the benthic assemblages of both ostracodes and foraminifera that can be attributed to degradation in water quality. These changes represent perturbations to the natural variability in faunal assemblages, which are normally driven by climatically influenced changes in salinity regimes. Changes in 20th century benthic communities were characterized by the rise to dominance of facultative anaerobic taxa tolerant of hypoxia and detrital-feeding species, reflecting increased influx of organic matter, and perhaps greater turbidity. Results support the hypothesis of Orth et al. (2002) and Orth and Moore (1983) that unprecedented changes to the bay ecosystem affected submerged aquatic vegetation in the Tangiers-Pocomoke region prior to large-scale monitoring began in the 1970s and 80s. Comparison of Pocomoke paleoecological record with those from the mainstem bay indicate that environmental degradation during the 20th century was nearly synchronous bay-wide within the limits of sediment core chronology (10-20 years). \r\n\r\nStable isotopic evidence for decadal water quality changes. Stable isotopic records from benthic foraminifera in Pocomoke Sound sediment cores, especially oxygen isotopes, document regional decadal and centennial climate processes which influence salinity and water quality over the past few centuries. These results provide indirect evidence for discharge-driven changes in freshwater and presumably river-borne sediment from the watershed to the sound. They are consistent with studies in the mainstem indicating the important influence of climatic and hydrological processes on water quality. \r\n\r\nPollen evidence for high sedimentation and vegetation change during colonial land clearance. Pollen assemblages from sediment cores in Pocomoke Sound document high sedimentation rates (0.7->4.0 cm yr -1 ) at most sites throughout the Sound in post-Colonial time. These results confirm those from other regions of the bay that land-clearance increased the flux of river-borne sediment to certain r","language":"ENGLISH","publisher":"Geological Survey (U.S.)","doi":"10.3133/ofr20041350","usgsCitation":"Cronin, T.M., 2004, Pocomoke Sound Sedimentary and Ecosystem History  (Online only): U.S. Geological Survey Open-File Report 2004-1350, 141 p., https://doi.org/10.3133/ofr20041350.","productDescription":"141 p.","onlineOnly":"Y","costCenters":[{"id":595,"text":"U.S. Geological Survey","active":false,"usgs":true}],"links":[{"id":192810,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/usgs_thumb.jpg"},{"id":7565,"rank":100,"type":{"id":15,"text":"Index Page"},"url":"https://pubs.usgs.gov/of/2004/1350/","linkFileType":{"id":5,"text":"html"}}],"edition":"Online only","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4ad8e4b07f02db684ab0","contributors":{"authors":[{"text":"Cronin, Thomas M. 0000-0002-2643-0979 tcronin@usgs.gov","orcid":"https://orcid.org/0000-0002-2643-0979","contributorId":2579,"corporation":false,"usgs":true,"family":"Cronin","given":"Thomas","email":"tcronin@usgs.gov","middleInitial":"M.","affiliations":[{"id":40020,"text":"Florence Bascom Geoscience Center","active":true,"usgs":true},{"id":243,"text":"Eastern Geology and Paleoclimate Science Center","active":true,"usgs":true}],"preferred":true,"id":286591,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}}
,{"id":57981,"text":"ofr20041306 - 2004 - Quality assurance report - Loch Vale watershed, 1999-2002","interactions":[],"lastModifiedDate":"2022-09-16T20:26:56.802384","indexId":"ofr20041306","displayToPublicDate":"2004-01-01T00:00:00","publicationYear":"2004","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":330,"text":"Open-File Report","code":"OFR","onlineIssn":"2331-1258","printIssn":"0196-1497","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"2004-1306","title":"Quality assurance report - Loch Vale watershed, 1999-2002","docAbstract":"<p>The National Park Service initiated the Loch Vale Watershed (LVWS) project in 1980 with funding from the Aquatic Effects Research Program of the National Acid Precipitation Assessment Program. Long-term ecological research and monitoring address watershed-scale ecosystem processes, particularly as they respond to atmospheric deposition and climate variability. Monitoring of meteorological, hydrologic, precipitation chemistry, and surface water quality parameters enable us to use long-term trends to distinguish natural from human-caused disturbances. Research into snow distribution, hydrologic flowpaths, vegetation responses to N deposition, isotopic transformations of N by forest and soil processes, trace metals, and aquatic ecological responses to disturbance enable us to understand processes that influence high elevation ecosystems.</p>","language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Reston, VA","doi":"10.3133/ofr20041306","collaboration":"In collaboration with Natural Resource Ecology Laboratory","usgsCitation":"Botte, J.A., and Baron, J., 2004, Quality assurance report - Loch Vale watershed, 1999-2002: U.S. Geological Survey Open-File Report 2004-1306, iii, 17 p., https://doi.org/10.3133/ofr20041306.","productDescription":"iii, 17 p.","numberOfPages":"20","onlineOnly":"N","additionalOnlineFiles":"N","temporalStart":"1999-01-01","costCenters":[{"id":291,"text":"Fort Collins Science Center","active":true,"usgs":true}],"links":[{"id":185199,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/ofr20041306.PNG"},{"id":406883,"rank":3,"type":{"id":36,"text":"NGMDB Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_69659.htm","linkFileType":{"id":5,"text":"html"}},{"id":320292,"rank":2,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/of/2004/1306/report.pdf","linkFileType":{"id":1,"text":"pdf"}}],"country":"United States","state":"Colorado","otherGeospatial":"Loch Vale watershed","geographicExtents":"{\n  \"type\": \"FeatureCollection\",\n  \"features\": [\n    {\n      \"type\": \"Feature\",\n      \"properties\": {},\n      \"geometry\": {\n        \"type\": \"Polygon\",\n        \"coordinates\": [\n          [\n            [\n              -105.6378,\n              40.2828\n            ],\n            [\n              -105.8464,\n              40.2828\n            ],\n            [\n              -105.8464,\n              40.3089\n            ],\n            [\n              -105.6378,\n              40.3089\n            ],\n            [\n              -105.6378,\n              40.2828\n            ]\n          ]\n        ]\n      }\n    }\n  ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4a73e4b07f02db643d2c","contributors":{"authors":[{"text":"Botte, Jorin A.","contributorId":106571,"corporation":false,"usgs":true,"family":"Botte","given":"Jorin","email":"","middleInitial":"A.","affiliations":[],"preferred":false,"id":258090,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Baron, Jill 0000-0002-5902-6251 jill_baron@usgs.gov","orcid":"https://orcid.org/0000-0002-5902-6251","contributorId":194124,"corporation":false,"usgs":true,"family":"Baron","given":"Jill","email":"jill_baron@usgs.gov","affiliations":[{"id":291,"text":"Fort Collins Science Center","active":true,"usgs":true}],"preferred":true,"id":258089,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}}
,{"id":57982,"text":"ofr20041291 - 2004 - Stratton Sagebrush Hydrology Study Area: An annotated bibliography of research conducted 1968-1990","interactions":[],"lastModifiedDate":"2016-05-23T11:41:48","indexId":"ofr20041291","displayToPublicDate":"2004-01-01T00:00:00","publicationYear":"2004","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":330,"text":"Open-File Report","code":"OFR","onlineIssn":"2331-1258","printIssn":"0196-1497","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"2004-1291","title":"Stratton Sagebrush Hydrology Study Area: An annotated bibliography of research conducted 1968-1990","docAbstract":"<p>This annotated bibliography provides an overview of research projects conducted on the Stratton Sagebrush Hydrology Study Area (Stratton) since its designation as such in 1967. Sources include the Rocky Mountain Forest and Range Experiment Station records storage room, Laramie, Wyoming, the USGS and USFS online reference libraries, and scientific journal databases at the University of Wyoming and Colorado State University. This annotated bibliography summarizes publications from research conducted at Stratton during the prime of its tenure as a research lab from 1968 to 1990. In addition, an appendix is included that catalogues all data on file at the Rocky Mountain Forest and Range Experiment Station in Laramie, Wyoming. Each file folder was searched and its contents recorded here for the researcher seeking original data sets, charts, photographs and records.</p>","language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Reston, VA","doi":"10.3133/ofr20041291","usgsCitation":"Burgess, L.M., and Schoenecker, K.A., 2004, Stratton Sagebrush Hydrology Study Area: An annotated bibliography of research conducted 1968-1990: U.S. Geological Survey Open-File Report 2004-1291, iii, 40 p., https://doi.org/10.3133/ofr20041291.","productDescription":"iii, 40 p.","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[{"id":291,"text":"Fort Collins Science Center","active":true,"usgs":true}],"links":[{"id":185200,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/ofr20041291.PNG"},{"id":320291,"rank":2,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/of/2004/1291/report.pdf","linkFileType":{"id":1,"text":"pdf"}}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4b16e4b07f02db6a52b4","contributors":{"authors":[{"text":"Burgess, Leah M.","contributorId":58713,"corporation":false,"usgs":true,"family":"Burgess","given":"Leah","email":"","middleInitial":"M.","affiliations":[],"preferred":false,"id":258092,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Schoenecker, Kathryn A. 0000-0001-9906-911X schoeneckerk@usgs.gov","orcid":"https://orcid.org/0000-0001-9906-911X","contributorId":2001,"corporation":false,"usgs":true,"family":"Schoenecker","given":"Kathryn","email":"schoeneckerk@usgs.gov","middleInitial":"A.","affiliations":[{"id":291,"text":"Fort Collins Science Center","active":true,"usgs":true}],"preferred":true,"id":258091,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}}
,{"id":1015143,"text":"1015143 - 2004 - Patterns of nitrogen accumulation and cycling in riparian floodplain ecosystems along the Green and Yampa rivers","interactions":[],"lastModifiedDate":"2017-04-19T09:43:09","indexId":"1015143","displayToPublicDate":"2004-01-01T00:00:00","publicationYear":"2004","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2932,"text":"Oecologia","active":true,"publicationSubtype":{"id":10}},"title":"Patterns of nitrogen accumulation and cycling in riparian floodplain ecosystems along the Green and Yampa rivers","docAbstract":"<p><span>Patterns of nitrogen (N) accumulation and turnover in riparian systems in semi-arid regions are poorly understood, particularly in those ecosystems that lack substantial inputs from nitrogen fixing vegetation. We investigated sources and fluxes of N in chronosequences of riparian forests along the regulated Green River and the free-flowing Yampa River in semi-arid northwestern Colorado. Both rivers lack significant inputs from N-fixing vegetation. Total soil nitrogen increased through time along both rivers, at a rate of about 7.8&nbsp;g N m</span><sup>−2</sup><span> year</span><sup>−1</sup><span> for years 10–70, and 2.7&nbsp;g N m</span><sup>−2</sup><span>year</span><sup>−1</sup><span> from years 70–170. We found that the concentration of N in freshly deposited sediments could account for most of the soil N that accumulated in these floodplain soils. Available N (measured by ion exchange resin bags) increased with age along both rivers, more than doubling in 150&nbsp;years. In contrast to the similar levels of total soil N along these rivers, N turnover rates, annual N mineralization, net nitrification rates, resin-N, and foliar N were all 2–4 times higher along the Green River than the Yampa River. N mineralization and net nitrification rates generally increased through time to steady or slightly declining rates along the Yampa River. Along the Green River, rates of mineralization and nitrification were highest in the youngest age class. The high levels of available N and N turnover in young sites are not characteristic of riparian chronosequences and could be related to changes in hydrology or plant community composition associated with the regulation of the Green River.</span></p>","language":"English","publisher":"Springer","doi":"10.1007/s00442-004-1486-6","usgsCitation":"Carol E., A., Binkley, D., and Andersen, D., 2004, Patterns of nitrogen accumulation and cycling in riparian floodplain ecosystems along the Green and Yampa rivers: Oecologia, v. 139, no. 1, p. 108-116, https://doi.org/10.1007/s00442-004-1486-6.","productDescription":"9 p.","startPage":"108","endPage":"116","costCenters":[{"id":291,"text":"Fort Collins Science Center","active":true,"usgs":true}],"links":[{"id":131791,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Colorado","otherGeospatial":"Green river, Yampa river","volume":"139","issue":"1","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4ae1e4b07f02db688ad1","contributors":{"authors":[{"text":"Carol E., Adair","contributorId":126967,"corporation":false,"usgs":false,"family":"Carol E.","given":"Adair","email":"","affiliations":[{"id":6735,"text":"University of Vermont, Rubenstein School of Environment and Natural Resources","active":true,"usgs":false}],"preferred":false,"id":322317,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Binkley, Dan","contributorId":102419,"corporation":false,"usgs":true,"family":"Binkley","given":"Dan","affiliations":[],"preferred":false,"id":322319,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Andersen, Douglas C. doug_andersen@usgs.gov","contributorId":2216,"corporation":false,"usgs":true,"family":"Andersen","given":"Douglas C.","email":"doug_andersen@usgs.gov","affiliations":[{"id":291,"text":"Fort Collins Science Center","active":true,"usgs":true}],"preferred":false,"id":322318,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}}
,{"id":1001748,"text":"1001748 - 2004 - The flora of the Cottonwood Lake Study Area, Stutsman County, North Dakota","interactions":[],"lastModifiedDate":"2018-01-04T12:16:27","indexId":"1001748","displayToPublicDate":"2004-01-01T00:00:00","publicationYear":"2004","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3111,"text":"Prairie Naturalist","active":true,"publicationSubtype":{"id":10}},"title":"The flora of the Cottonwood Lake Study Area, Stutsman County, North Dakota","docAbstract":"The 92 ha Cottonwood Lake Study Area is located in south-central North Dakota along the eastern edge of a glacial stagnation moraine known as the Missouri Coteau. The study area has been the focus of biologic and hydrologic research since the U.S. Fish and Wildlife Service purchased the site in 1963. We studied the plant communities of the Cottonwood Lake Study Area from 1992 to 2001. During this time period, the vascular flora of the study area consisted of 220 species representing 51 families. Over half of the species were perennial forbs (117 species). Perennial grasses (26 species) and annual forbs (22 species) made up the next two largest physiognomic groupings. The flora, having a mean Coefficient of Conservatism of 4.6 and a Floristic Quality Index of 62, consisted of 187 native species. Thirty-three species were non-natives. Our annotated list should provide information useful to researchers, graduate students, and others as they design and implement future studies in wetlands and uplands both in and around the Cottonwood Lake Study Area.","language":"English","publisher":"Prairie Naturalist","usgsCitation":"Mushet, D., Euliss, N., Lane, S., and Goldade, C., 2004, The flora of the Cottonwood Lake Study Area, Stutsman County, North Dakota: Prairie Naturalist, v. 36, p. 43-62.","productDescription":"20 p.","startPage":"43","endPage":"62","costCenters":[{"id":480,"text":"Northern Prairie Wildlife Research Center","active":true,"usgs":true}],"links":[{"id":134032,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"36","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4a9ae4b07f02db65daf2","contributors":{"authors":[{"text":"Mushet, D.M. 0000-0002-5910-2744","orcid":"https://orcid.org/0000-0002-5910-2744","contributorId":59377,"corporation":false,"usgs":true,"family":"Mushet","given":"D.M.","affiliations":[],"preferred":false,"id":311661,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Euliss, N.H. Jr.","contributorId":54917,"corporation":false,"usgs":true,"family":"Euliss","given":"N.H.","suffix":"Jr.","email":"","affiliations":[],"preferred":false,"id":311660,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Lane, S.P.","contributorId":75495,"corporation":false,"usgs":true,"family":"Lane","given":"S.P.","email":"","affiliations":[],"preferred":false,"id":311662,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Goldade, C.M.","contributorId":83471,"corporation":false,"usgs":true,"family":"Goldade","given":"C.M.","email":"","affiliations":[],"preferred":false,"id":311663,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}}
,{"id":1000913,"text":"1000913 - 2004 - Great Lakes clams find refuge from zebra mussels in restored, lake-connected marsh (Ohio)","interactions":[],"lastModifiedDate":"2012-02-02T00:04:41","indexId":"1000913","displayToPublicDate":"2004-01-01T00:00:00","publicationYear":"2004","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1462,"text":"Ecological Restoration","active":true,"publicationSubtype":{"id":10}},"title":"Great Lakes clams find refuge from zebra mussels in restored, lake-connected marsh (Ohio)","docAbstract":"Since the early 1990s, more than 95 percent of the freshwater clams once found in Lake Erie have died due to the exotic zebara mussel (Dreissena polymorpha). Zebra mussels attach themselves to native clams in large numbers, impeding the ability of the clams to eat and burrow.  However, in 1996, we discovered a population of native clams in Metzger Marsh in western Lake Erie (about 50 miles [80 km] east of Toledo) that were thriving despite the longtime presence of zebra mussel in surrounding waters.  At that time, Metzger Marsh was undergoing extensive restoration, including construction of a dike to replace the eroded barrier beach and of a water-control structure to maintain hydrologic connections with the lake (Wilcox and Whillans 1999).  The restoration plan called for a drawdown of water levels to promote plant growth from the seedbank -- a process that would also destroy most of the clam population.  State and federal resource managers recommended removing as many clams as possible to a site that was isolated from zebra mussels, and then returning them to the marsh after it was restored.  We removed about 7,000 native clams in 1996 and moved them back to Metzger Marsh in 1999.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Ecological Restoration","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","usgsCitation":"Nichols, S.J., and Wilcox, D.A., 2004, Great Lakes clams find refuge from zebra mussels in restored, lake-connected marsh (Ohio): Ecological Restoration, v. 22, no. 1, p. 51-52.","productDescription":"p. 51-52","startPage":"51","endPage":"52","numberOfPages":"1","costCenters":[{"id":324,"text":"Great Lakes Science Center","active":true,"usgs":true}],"links":[{"id":133112,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"22","issue":"1","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4abae4b07f02db671f4b","contributors":{"authors":[{"text":"Nichols, S. Jerrine","contributorId":25887,"corporation":false,"usgs":true,"family":"Nichols","given":"S.","email":"","middleInitial":"Jerrine","affiliations":[],"preferred":false,"id":309825,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Wilcox, Douglas A.","contributorId":36880,"corporation":false,"usgs":true,"family":"Wilcox","given":"Douglas","email":"","middleInitial":"A.","affiliations":[],"preferred":false,"id":309826,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}}
,{"id":1000880,"text":"1000880 - 2004 - A Holocene history of dune-mediated landscape change along the southeastern shore of Lake Superior","interactions":[],"lastModifiedDate":"2013-01-22T15:45:29","indexId":"1000880","displayToPublicDate":"2004-01-01T00:00:00","publicationYear":"2004","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1801,"text":"Geomorphology","active":true,"publicationSubtype":{"id":10}},"title":"A Holocene history of dune-mediated landscape change along the southeastern shore of Lake Superior","docAbstract":"Causal links that connect Holocene high stands of Lake Superior with dune building, stream damming and diversion and reservoir impoundment and infilling are inferred from a multidisciplinary investigation of a small watershed along the SE shore of Lake Superior. Radiocarbon ages of wood fragments from in-place stumps and soil O horizons, recovered from the bottom of 300-ha Grand Sable Lake, suggest that the near-shore inland lake was formed during multiple episodes of late Holocene dune damming of ancestral Sable Creek. Forest drownings at ~3000, 1530, and 300 cal. years BP are highly correlated with local soil burial events that occurred during high stands of Lake Superior. During these and earlier events, Sable Creek was diverted onto eastward-graded late Pleistocene meltwater terraces. Ground penetrating radar (GPR) reveals the early Holocene valley of Sable Creek (now filled) and its constituent sedimentary structures. Near-planar paleosols, identified with GPR, suggest two repeating modes of landscape evolution mediated by levels of Lake Superior. High lake stands drove stream damming, reservoir impoundment, and eolian infilling of impoundments. Falling Lake Superior levels brought decreased sand supply to dune dams and lowered stream base level. These latter factors promoted stream piracy, breaching of dune dams, and aerial exposure and forestation of infilled lakebeds. The bathymetry of Grand Sable Lake suggests that its shoreline configuration and depth varied in response to events of dune damming and subsequent dam breaching. The interrelated late Holocene events apparent in this study area suggest that variations in lake level have imposed complex hydrologic and geomorphic signatures on upper Great Lakes coasts.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Geomorphology","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1016/j.geomorph.2004.01.005","usgsCitation":"Loope, W.L., Fisher, T.G., Jol, H.M., Anderton, J.B., and Blewett, W.L., 2004, A Holocene history of dune-mediated landscape change along the southeastern shore of Lake Superior: Geomorphology, v. 61, no. 3-4, p. 303-322, https://doi.org/10.1016/j.geomorph.2004.01.005.","productDescription":"p. 303-322","startPage":"303","endPage":"322","numberOfPages":"19","costCenters":[{"id":324,"text":"Great Lakes Science Center","active":true,"usgs":true}],"links":[{"id":133541,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":266265,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/j.geomorph.2004.01.005"}],"volume":"61","issue":"3-4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4b30e4b07f02db6b4100","contributors":{"authors":[{"text":"Loope, Walter L. wloope@usgs.gov","contributorId":4616,"corporation":false,"usgs":true,"family":"Loope","given":"Walter","email":"wloope@usgs.gov","middleInitial":"L.","affiliations":[{"id":324,"text":"Great Lakes Science Center","active":true,"usgs":true}],"preferred":true,"id":309719,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Fisher, Timothy G.","contributorId":45659,"corporation":false,"usgs":true,"family":"Fisher","given":"Timothy","email":"","middleInitial":"G.","affiliations":[],"preferred":false,"id":309722,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Jol, Harry M.","contributorId":11571,"corporation":false,"usgs":true,"family":"Jol","given":"Harry","email":"","middleInitial":"M.","affiliations":[],"preferred":false,"id":309720,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Anderton, John B.","contributorId":23880,"corporation":false,"usgs":true,"family":"Anderton","given":"John","email":"","middleInitial":"B.","affiliations":[],"preferred":false,"id":309721,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Blewett, William L.","contributorId":57031,"corporation":false,"usgs":true,"family":"Blewett","given":"William","email":"","middleInitial":"L.","affiliations":[],"preferred":false,"id":309723,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}}
,{"id":70194930,"text":"70194930 - 2004 - Enhanced gas-phase transport in a deep unsaturated zone, Amargosa Desert (U.S.A.) ","interactions":[],"lastModifiedDate":"2020-05-01T18:24:57.863407","indexId":"70194930","displayToPublicDate":"2004-01-01T00:00:00","publicationYear":"2004","noYear":false,"publicationType":{"id":24,"text":"Conference Paper"},"publicationSubtype":{"id":19,"text":"Conference Paper"},"title":"Enhanced gas-phase transport in a deep unsaturated zone, Amargosa Desert (U.S.A.) ","docAbstract":"<p>No abstract available.</p>","largerWorkType":{"id":4,"text":"Book"},"largerWorkTitle":"International conference on finite element models, MODFLOW, and more: Solving groundwater problems","largerWorkSubtype":{"id":12,"text":"Conference publication"},"conferenceTitle":"International conference on finite element models, MODFLOW, and more: Solving groundwater problems","conferenceDate":"September 13-16, 2004","conferenceLocation":"Karlovy Vary, Czech Republic","language":"English","publisher":"Colorado School of Mines","usgsCitation":"Walvoord, M.A., and Stonestrom, D.A., 2004, Enhanced gas-phase transport in a deep unsaturated zone, Amargosa Desert (U.S.A.) , <i>in</i> International conference on finite element models, MODFLOW, and more: Solving groundwater problems, Karlovy Vary, Czech Republic, September 13-16, 2004, p. 227-230.","productDescription":"4 p.","startPage":"227","endPage":"230","costCenters":[{"id":465,"text":"Nevada Water Science 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,{"id":1016585,"text":"1016585 - 2004 - The wetland continuum: A conceptual framework for interpreting biological studies","interactions":[],"lastModifiedDate":"2021-11-01T16:53:10.283798","indexId":"1016585","displayToPublicDate":"2004-01-01T00:00:00","publicationYear":"2004","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3750,"text":"Wetlands","onlineIssn":"1943-6246","printIssn":"0277-5212","active":true,"publicationSubtype":{"id":10}},"title":"The wetland continuum: A conceptual framework for interpreting biological studies","docAbstract":"We describe a conceptual model, the wetland continuum, which allows wetland managers, scientists, and ecologists to consider simultaneously the influence of climate and hydrologic setting on wetland biological communities. Although multidimensional, the wetland continuum is most easily represented as a two-dimensional gradient, with ground water and atmospheric water constituting the horizontal and vertical axis, respectively. By locating the position of a wetland on both axes of the continuum, the potential biological expression of the wetland can be predicted at any point in time. The model provides a framework useful in the organization and interpretation of biological data from wetlands by incorporating the dynamic changes these systems undergo as a result of normal climatic variation rather than placing them into static categories common to many wetland classification systems. While we developed this model from the literature available for depressional wetlands in the prairie pothole region of North America, we believe the concept has application to wetlands in many other geographic locations.","language":"English","publisher":"Springer Nature","doi":"10.1672/0277-5212(2004)024[0448:TWCACF]2.0.CO;2","usgsCitation":"Euliss, N., LaBaugh, J.W., Fredrickson, L., Mushet, D., Laubhan, M.K., Swanson, G., Winter, T.C., Rosenberry, D., and Nelson, R., 2004, The wetland continuum: A conceptual framework for interpreting biological studies: Wetlands, v. 24, no. 2, p. 448-458, https://doi.org/10.1672/0277-5212(2004)024[0448:TWCACF]2.0.CO;2.","productDescription":"11 p.","startPage":"448","endPage":"458","costCenters":[{"id":480,"text":"Northern Prairie Wildlife Research Center","active":true,"usgs":true}],"links":[{"id":128597,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"24","issue":"2","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4a58e4b07f02db62eb86","contributors":{"authors":[{"text":"Euliss, N.H. Jr.","contributorId":54917,"corporation":false,"usgs":true,"family":"Euliss","given":"N.H.","suffix":"Jr.","email":"","affiliations":[],"preferred":false,"id":324441,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"LaBaugh, J. W.","contributorId":23484,"corporation":false,"usgs":true,"family":"LaBaugh","given":"J.","email":"","middleInitial":"W.","affiliations":[],"preferred":false,"id":324437,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Fredrickson, L.H.","contributorId":91042,"corporation":false,"usgs":true,"family":"Fredrickson","given":"L.H.","email":"","affiliations":[],"preferred":false,"id":324443,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Mushet, D.M. 0000-0002-5910-2744","orcid":"https://orcid.org/0000-0002-5910-2744","contributorId":59377,"corporation":false,"usgs":true,"family":"Mushet","given":"D.M.","affiliations":[],"preferred":false,"id":324442,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Laubhan, Murray K.","contributorId":100324,"corporation":false,"usgs":true,"family":"Laubhan","given":"Murray","email":"","middleInitial":"K.","affiliations":[],"preferred":false,"id":826102,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Swanson, G.A.","contributorId":49299,"corporation":false,"usgs":true,"family":"Swanson","given":"G.A.","email":"","affiliations":[],"preferred":false,"id":324440,"contributorType":{"id":1,"text":"Authors"},"rank":6},{"text":"Winter, T. C.","contributorId":23485,"corporation":false,"usgs":true,"family":"Winter","given":"T.","email":"","middleInitial":"C.","affiliations":[],"preferred":false,"id":324438,"contributorType":{"id":1,"text":"Authors"},"rank":7},{"text":"Rosenberry, D.O. 0000-0003-0681-5641","orcid":"https://orcid.org/0000-0003-0681-5641","contributorId":38500,"corporation":false,"usgs":true,"family":"Rosenberry","given":"D.O.","affiliations":[],"preferred":true,"id":324439,"contributorType":{"id":1,"text":"Authors"},"rank":8},{"text":"Nelson, R.D.","contributorId":21898,"corporation":false,"usgs":true,"family":"Nelson","given":"R.D.","email":"","affiliations":[],"preferred":false,"id":324436,"contributorType":{"id":1,"text":"Authors"},"rank":9}]}}
,{"id":1000867,"text":"1000867 - 2004 - Rapid assessment indicator of wetland integrity as an unintended predictor of avian diversity","interactions":[],"lastModifiedDate":"2016-05-12T11:51:30","indexId":"1000867","displayToPublicDate":"2004-01-01T00:00:00","publicationYear":"2004","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1919,"text":"Hydrobiologia","onlineIssn":"1573-5117","printIssn":"0018-8158","active":true,"publicationSubtype":{"id":10}},"title":"Rapid assessment indicator of wetland integrity as an unintended predictor of avian diversity","docAbstract":"<p>Rapid assessment of aquatic ecosystems has been widely implemented, sometimes without thorough evaluation of the robustness of rapid assessment metrics as indicators of ecological integrity. Here, we evaluate whether the Ohio Rapid Assessment Method (ORAM) for Wetlands Version 5.0 is a useful indicator of ecological integrity beyond its intended purpose. ORAM was developed to categorize natural wetlands for regulatory purposes and to contribute to the development of indicators of biotic integrity. It was never intended for use as an index of the quality of habitat for wetland birds. Nonetheless, it is conceivable that ORAM scores could serve as adequate predictors of avian diversity. We evaluated whether avian species richness in wetlands could be reliably predicted from each of the following variables: (1) total ORAM score, (2) total score minus the score for one metric that did not apply to all wetlands, and (3) sum of scores for the four ORAM components (of 16 scored) with the highest potential point total. These four components corresponded to aquatic vegetation communities, microtopography, modifications to natural hydrologic regime, and sources of water. All three variables were significant predictors of both total species richness and mean species richness of birds of conservation concern. Variable (3) was a significant predictor of mean species richness of wetland-dependent birds. Variable (2) was a weak predictor of both total and mean species richness of all birds combined. These results extend the robustness of ORAM as an indicator of the ecological integrity of wetlands.</p>","language":"English","publisher":"Springer","doi":"10.1023/B:HYDR.0000027731.16535.53","usgsCitation":"Stapanian, M.A., Waite, T.A., Krzys, G., Mack, J.J., and Micacchion, M., 2004, Rapid assessment indicator of wetland integrity as an unintended predictor of avian diversity: Hydrobiologia, v. 520, no. 1-3, p. 119-126, https://doi.org/10.1023/B:HYDR.0000027731.16535.53.","productDescription":"8 p.","startPage":"119","endPage":"126","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[{"id":324,"text":"Great Lakes Science Center","active":true,"usgs":true}],"links":[{"id":133562,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"520","issue":"1-3","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4a80e4b07f02db64945e","contributors":{"authors":[{"text":"Stapanian, Martin A. 0000-0001-8173-4273 mstapanian@usgs.gov","orcid":"https://orcid.org/0000-0001-8173-4273","contributorId":3425,"corporation":false,"usgs":true,"family":"Stapanian","given":"Martin","email":"mstapanian@usgs.gov","middleInitial":"A.","affiliations":[{"id":324,"text":"Great Lakes Science Center","active":true,"usgs":true}],"preferred":true,"id":309663,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Waite, Thomas A.","contributorId":98691,"corporation":false,"usgs":true,"family":"Waite","given":"Thomas","email":"","middleInitial":"A.","affiliations":[],"preferred":false,"id":309667,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Krzys, Gregory","contributorId":87508,"corporation":false,"usgs":true,"family":"Krzys","given":"Gregory","email":"","affiliations":[],"preferred":false,"id":309666,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Mack, John J.","contributorId":55395,"corporation":false,"usgs":true,"family":"Mack","given":"John","email":"","middleInitial":"J.","affiliations":[],"preferred":false,"id":309665,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Micacchion, Mick","contributorId":21511,"corporation":false,"usgs":true,"family":"Micacchion","given":"Mick","affiliations":[],"preferred":false,"id":309664,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}}
,{"id":70026439,"text":"70026439 - 2004 - Frequency spectral analysis of GPR data over a crude oil spill","interactions":[],"lastModifiedDate":"2020-03-10T16:56:50","indexId":"70026439","displayToPublicDate":"2004-01-01T00:00:00","publicationYear":"2004","noYear":false,"publicationType":{"id":24,"text":"Conference Paper"},"publicationSubtype":{"id":19,"text":"Conference Paper"},"title":"Frequency spectral analysis of GPR data over a crude oil spill","docAbstract":"A multi-offset ground penetrating radar (GPR) dataset was acquired by the U.S. Geological Survey (USGS) at a crude oil spill site near Bemidji, Minnesota, USA. The dataset consists of two, parallel profiles, each with 17 transmitter-receiver offsets ranging from 0.60 to 5.15m. One profile was acquired over a known oil pool floating on the water table, and the other profile was acquired over an uncontaminated area. The data appear to be more attenuated, or at least exhibit less reflectivity, in the area over the oil pool. In an attempt to determine the frequency dependence of this apparent attenuation, several attributes of the frequency spectra of the data were analyzed after accounting for the effects on amplitude of the radar system (radiation pattern), changes in antenna-ground coupling, and spherical divergence. The attributes analyzed were amplitude spectra peak frequency, 6 dB down, or half-amplitude, spectrum width, and the low and high frequency slopes between the 3 and 9 dB down points. The most consistent trend was observed for Fourier transformed full traces at offsets 0.81, 1.01, and 1.21m which displayed steeper low frequency slopes over the area corresponding to the oil pool. The Fourier-transformed time-windowed traces, where each window was equal to twice the airwave wavelet length, exhibited weakly consistent attribute trends from offset to offset and from window to window. The fact that strong, consistent oil indicators are not seen in this analysis indicates that another mechanism due to the presence of the oil, such as a gradient in the electromagnetic properties, may simply suppress reflections over the contaminated zone.","largerWorkType":{"id":4,"text":"Book"},"largerWorkTitle":"Proceedings of the Tenth International Conference Ground Penetrating Radar, GPR 2004","largerWorkSubtype":{"id":12,"text":"Conference publication"},"conferenceTitle":"Proceedings of the Tenth International Conference Ground Penetrating Radar, GPR 2004","conferenceDate":"June 21-24, 2004","language":"English","isbn":"9090179593","usgsCitation":"Burton, B., Olhoeft, G., and Powers, M., 2004, Frequency spectral analysis of GPR data over a crude oil spill, <i>in</i> Proceedings of the Tenth International Conference Ground Penetrating Radar, GPR 2004, v. 1, June 21-24, 2004, p. 267-270.","productDescription":"4 p.","startPage":"267","endPage":"270","numberOfPages":"4","costCenters":[{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":234302,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"1","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a13d4e4b0c8380cd547c4","contributors":{"editors":[{"text":"Slob E.Yarovoy A.Rhebergen J.B.","contributorId":128406,"corporation":true,"usgs":false,"organization":"Slob E.Yarovoy A.Rhebergen J.B.","id":536603,"contributorType":{"id":2,"text":"Editors"},"rank":1}],"authors":[{"text":"Burton, B.L.","contributorId":93983,"corporation":false,"usgs":true,"family":"Burton","given":"B.L.","email":"","affiliations":[],"preferred":false,"id":409531,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Olhoeft, G.R.","contributorId":10405,"corporation":false,"usgs":true,"family":"Olhoeft","given":"G.R.","email":"","affiliations":[],"preferred":false,"id":409529,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Powers, M.H.","contributorId":40352,"corporation":false,"usgs":true,"family":"Powers","given":"M.H.","email":"","affiliations":[],"preferred":false,"id":409530,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}}
,{"id":1001035,"text":"1001035 - 2004 - Implications of hydrologic variability on the succession of plants in Great Lakes wetlands","interactions":[],"lastModifiedDate":"2016-05-12T15:55:34","indexId":"1001035","displayToPublicDate":"2004-01-01T00:00:00","publicationYear":"2004","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":865,"text":"Aquatic Ecosystem Health & Management","active":true,"publicationSubtype":{"id":10}},"title":"Implications of hydrologic variability on the succession of plants in Great Lakes wetlands","docAbstract":"<p>Primary succession of plant communities directed toward a climax is not a typical occurrence in wetlands because these ecological systems are inherently dependent on hydrology, and temporal hydrologic variability often causes reversals or setbacks in succession. Wetlands of the Great Lakes provide good examples for demonstrating the implications of hydrology in driving successional processes and for illustrating potential misinterpretations of apparent successional sequences. Most Great Lakes coastal wetlands follow cyclic patterns in which emergent communities are reduced in area or eliminated by high lake levels and then regenerated from the seed bank during low lake levels. Thus, succession never proceeds for long. Wetlands also develop in ridge and swale terrains in many large embayments of the Great Lakes. These formations contain sequences of wetlands of similar origin but different age that can be several thousand years old, with older wetlands always further from the lake. Analyses of plant communities across a sequence of wetlands at the south end of Lake Michigan showed an apparent successional pattern from submersed to floating to emergent plants as water depth decreased with wetland age. However, paleoecological analyses showed that the observed vegetation changes were driven largely by disturbances associated with increased human settlement in the area. Climate-induced hydrologic changes were also shown to have greater effects on plant-community change than autogenic processes. Other terms, such as zonation, maturation, fluctuations, continuum concept, functional guilds, centrifugal organization, pulse stability, and hump-back models provide additional means of describing organization and changes in vegetation; some of them overlap with succession in describing vegetation processes in Great Lakes wetlands, but each must be used in the proper context with regard to short- and long-term hydrologic variability.</p>","language":"English","publisher":"Taylor & Francis","doi":"10.1080/14634980490461579","usgsCitation":"Wilcox, D.A., 2004, Implications of hydrologic variability on the succession of plants in Great Lakes wetlands: Aquatic Ecosystem Health & Management, v. 7, no. 2, p. 223-231, https://doi.org/10.1080/14634980490461579.","productDescription":"9 p.","startPage":"223","endPage":"231","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[{"id":324,"text":"Great Lakes Science Center","active":true,"usgs":true}],"links":[{"id":478283,"rank":1,"type":{"id":41,"text":"Open Access External Repository Page"},"url":"http://hdl.handle.net/20.500.12648/2296","text":"External Repository"},{"id":133742,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"7","issue":"2","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e49fde4b07f02db5f6017","contributors":{"authors":[{"text":"Wilcox, Douglas A.","contributorId":36880,"corporation":false,"usgs":true,"family":"Wilcox","given":"Douglas","email":"","middleInitial":"A.","affiliations":[],"preferred":false,"id":310285,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}}
,{"id":70026708,"text":"70026708 - 2004 - Hydrochemical tracers in the middle Rio Grande Basin, USA: 2. Calibration of a groundwater-flow model","interactions":[],"lastModifiedDate":"2020-01-05T14:33:07","indexId":"70026708","displayToPublicDate":"2004-01-01T00:00:00","publicationYear":"2004","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1923,"text":"Hydrogeology Journal","active":true,"publicationSubtype":{"id":10}},"title":"Hydrochemical tracers in the middle Rio Grande Basin, USA: 2. Calibration of a groundwater-flow model","docAbstract":"<p>The calibration of a groundwater model with the aid of hydrochemical data has demonstrated that low recharge rates in the Middle Rio Grande Basin may be responsible for a groundwater trough in the center of the basin and for a substantial amount of Rio Grande water in the regional flow system. Earlier models of the basin had difficulty reproducing these features without any hydrochemical data to constrain the rates and distribution of recharge. The objective of this study was to use the large quantity of available hydrochemical data to help calibrate the model parameters, including the recharge rates. The model was constructed using the US Geological Survey's software MODFLOW, MODPATH, and UCODE, and calibrated using 14C activities and the positions of certain flow zones defined by the hydrochemical data. Parameter estimation was performed using a combination of nonlinear regression techniques and a manual search for the minimum difference between field and simulated observations. The calibrated recharge values were substantially smaller than those used in previous models. Results from a 30,000-year transient simulation suggest that recharge was at a maximum about 20,000 years ago and at a minimum about 10,000 years ago.&nbsp;</p>","language":"English","publisher":"Springer","doi":"10.1007/s10040-004-0326-4","issn":"14312174","usgsCitation":"Sanford, W., Plummer, N., McAda, D.P., Bexfield, L.M., and Anderholm, S., 2004, Hydrochemical tracers in the middle Rio Grande Basin, USA: 2. Calibration of a groundwater-flow model: Hydrogeology Journal, v. 12, no. 4, p. 389-407, https://doi.org/10.1007/s10040-004-0326-4.","productDescription":"19 p.","startPage":"389","endPage":"407","numberOfPages":"19","costCenters":[{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":234317,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":208523,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1007/s10040-004-0326-4"}],"country":"United States","otherGeospatial":" Rio Grande Basin","geographicExtents":"{\n  \"type\": \"FeatureCollection\",\n  \"features\": [\n    {\n      \"type\": \"Feature\",\n      \"properties\": {},\n      \"geometry\": {\n        \"type\": \"Polygon\",\n        \"coordinates\": [\n          [\n            [\n              -109.599609375,\n              22.917922936146045\n            ],\n            [\n              -96.94335937499999,\n              22.917922936146045\n            ],\n            [\n              -96.94335937499999,\n              36.1733569352216\n            ],\n            [\n              -109.599609375,\n              36.1733569352216\n            ],\n            [\n              -109.599609375,\n              22.917922936146045\n            ]\n          ]\n        ]\n      }\n    }\n  ]\n}","volume":"12","issue":"4","noUsgsAuthors":false,"publicationDate":"2004-04-29","publicationStatus":"PW","scienceBaseUri":"505a3332e4b0c8380cd5edf0","contributors":{"authors":[{"text":"Sanford, W. E. 0000-0002-6624-0280","orcid":"https://orcid.org/0000-0002-6624-0280","contributorId":102112,"corporation":false,"usgs":true,"family":"Sanford","given":"W. E.","affiliations":[],"preferred":false,"id":410561,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Plummer, Niel 0000-0002-4020-1013 nplummer@usgs.gov","orcid":"https://orcid.org/0000-0002-4020-1013","contributorId":190100,"corporation":false,"usgs":true,"family":"Plummer","given":"Niel","email":"nplummer@usgs.gov","affiliations":[{"id":436,"text":"National Research Program - Eastern Branch","active":true,"usgs":true}],"preferred":true,"id":410559,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"McAda, D. P.","contributorId":93066,"corporation":false,"usgs":true,"family":"McAda","given":"D.","email":"","middleInitial":"P.","affiliations":[],"preferred":false,"id":410560,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Bexfield, L. M.","contributorId":36593,"corporation":false,"usgs":true,"family":"Bexfield","given":"L.","email":"","middleInitial":"M.","affiliations":[],"preferred":false,"id":410557,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Anderholm, S. K.","contributorId":69149,"corporation":false,"usgs":true,"family":"Anderholm","given":"S. K.","affiliations":[],"preferred":false,"id":410558,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}}
,{"id":70026901,"text":"70026901 - 2004 - Urban contribution of pharmaceuticals and other organic wastewater contaminants to streams during differing flow conditions","interactions":[],"lastModifiedDate":"2018-11-14T08:38:42","indexId":"70026901","displayToPublicDate":"2004-01-01T00:00:00","publicationYear":"2004","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3352,"text":"Science of the Total Environment","active":true,"publicationSubtype":{"id":10}},"title":"Urban contribution of pharmaceuticals and other organic wastewater contaminants to streams during differing flow conditions","docAbstract":"<p>During 2001, 76 water samples were collected upstream and downstream of select towns and cities in Iowa during high-, normal- and low-flow conditions to determine the contribution of urban centers to concentrations of pharmaceuticals and other organic wastewater contaminants (OWCs) in streams under varying flow conditions. The towns ranged in population from approximately 2000 to 200 000. Overall, one or more OWCs were detected in 98.7% of the samples collected, with 62 of the 105 compounds being found. The most frequently detected compounds were metolachlor (pesticide), cholesterol (plant and animal sterol), caffeine (stimulant), &beta;-sitosterol (plant sterol) and 1,7-dimethylxanthine (caffeine degradate). The number of OWCs detected decreased as streamflow increased from low- (51 compounds detected) to normal- (28) to high-flow (24) conditions. Antibiotics and other prescription drugs were only frequently detected during low-flow conditions. During low-flow conditions, 15 compounds (out of the 23) and ten compound groups (out of 11) detected in more than 10% of the streams sampled had significantly greater concentrations in samples collected downstream than in those collected upstream of the urban centers. Conversely, no significant differences in the concentrations were found during high-flow conditions. Thus, the urban contribution of OWCs to streams became progressively muted as streamflow increased.</p>","language":"English","publisher":"Elsevier","doi":"10.1016/j.scitotenv.2004.01.015","issn":"00489697","usgsCitation":"Kolpin, D., Skopec, M., Meyer, M.T., Furlong, E., and Zaugg, S., 2004, Urban contribution of pharmaceuticals and other organic wastewater contaminants to streams during differing flow conditions: Science of the Total Environment, v. 328, no. 1-3, p. 119-130, https://doi.org/10.1016/j.scitotenv.2004.01.015.","productDescription":"12 p.","startPage":"119","endPage":"130","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[{"id":351,"text":"Iowa Water Science Center","active":true,"usgs":true},{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":235395,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":209162,"rank":9999,"type":{"id":10,"text":"Digital Object 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T.","contributorId":92279,"corporation":false,"usgs":true,"family":"Meyer","given":"M.","email":"","middleInitial":"T.","affiliations":[],"preferred":false,"id":411558,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Furlong, E. T. 0000-0002-7305-4603","orcid":"https://orcid.org/0000-0002-7305-4603","contributorId":98346,"corporation":false,"usgs":true,"family":"Furlong","given":"E. T.","affiliations":[],"preferred":false,"id":411559,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Zaugg, S.D.","contributorId":82811,"corporation":false,"usgs":true,"family":"Zaugg","given":"S.D.","email":"","affiliations":[],"preferred":false,"id":411556,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}}
,{"id":70026903,"text":"70026903 - 2004 - Tire-wear particles as a source of zinc to the environment","interactions":[],"lastModifiedDate":"2018-11-14T10:45:28","indexId":"70026903","displayToPublicDate":"2004-01-01T00:00:00","publicationYear":"2004","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1565,"text":"Environmental Science & Technology","onlineIssn":"1520-5851","printIssn":"0013-936X","active":true,"publicationSubtype":{"id":10}},"title":"Tire-wear particles as a source of zinc to the environment","docAbstract":"<div class=\"hlFld-Abstract\"><div id=\"abstractBox\"><p class=\"articleBody_abstractText\">Tire-tread material has a zinc (Zn) content of about 1 wt %. The quantity of tread material lost to road surfaces by abrasion has not been well characterized. Two approaches were used to assess the magnitude of this nonpoint source of Zn in the U.S. for the period 1936−1999. In the first approach, tread-wear rates from the automotive engineering literature were used in conjunction with vehicle distance-driven data from the U.S. Department of Transportation to determine Zn releases. A second approach calculated this source term from the volume of tread lost during lifetime tire wear. These analyses showed that the quantity of Zn released by tire wear in the mid-1990s was of the same magnitude as that released from waste incineration. For 1999, the quantity of Zn released by tire wear in the U.S. is estimated to be 10 000−11 000 metric tons. A specific case study focused on Zn sources and sinks in an urban−suburban watershed (Lake Anne) in the Washington, DC, metropolitan area for a time period of the late 1990s. The atmospheric flux of total Zn (wet deposition) to the watershed was 2 μg/cm<sup>2</sup>/yr. The flux of Zn to the watershed estimated from tire wear was 42 μg/cm<sup>2</sup>/yr. The measured accumulation rate of total Zn in age-dated sediment cores from Lake Anne was 27 μg/cm<sup>2</sup>/yr. These data suggest that tire-wear Zn inputs to urban−suburban watersheds can be significantly greater than atmospheric inputs, although the watershed appears to retain appreciable quantities of vehicular Zn inputs.</p></div></div>","language":"English","publisher":"ACS","doi":"10.1021/es034631f","issn":"0013936X","usgsCitation":"Councell, T., Duckenfield, K., Landa, E.R., and Callender, E., 2004, Tire-wear particles as a source of zinc to the environment: Environmental Science & Technology, v. 38, no. 15, p. 4206-4214, https://doi.org/10.1021/es034631f.","productDescription":"9 p.","startPage":"4206","endPage":"4214","costCenters":[{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":209190,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1021/es034631f"},{"id":235433,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"38","issue":"15","noUsgsAuthors":false,"publicationDate":"2004-07-01","publicationStatus":"PW","scienceBaseUri":"505bb410e4b08c986b326165","contributors":{"authors":[{"text":"Councell, T.B.","contributorId":44187,"corporation":false,"usgs":true,"family":"Councell","given":"T.B.","email":"","affiliations":[],"preferred":false,"id":411574,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Duckenfield, K.U.","contributorId":59218,"corporation":false,"usgs":true,"family":"Duckenfield","given":"K.U.","email":"","affiliations":[],"preferred":false,"id":411575,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Landa, E. R.","contributorId":100002,"corporation":false,"usgs":true,"family":"Landa","given":"E.","email":"","middleInitial":"R.","affiliations":[],"preferred":false,"id":411577,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Callender, E.","contributorId":72528,"corporation":false,"usgs":true,"family":"Callender","given":"E.","email":"","affiliations":[],"preferred":false,"id":411576,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}}
,{"id":70026943,"text":"70026943 - 2004 - Preservation of water samples for arsenic(III/V) determinations: An evaluation of the literature and new analytical results","interactions":[],"lastModifiedDate":"2018-03-05T17:21:24","indexId":"70026943","displayToPublicDate":"2004-01-01T00:00:00","publicationYear":"2004","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":835,"text":"Applied Geochemistry","active":true,"publicationSubtype":{"id":10}},"title":"Preservation of water samples for arsenic(III/V) determinations: An evaluation of the literature and new analytical results","docAbstract":"Published literature on preservation procedures for stabilizing aqueous inorganic As(III/V) redox species contains discrepancies. This study critically evaluates published reports on As redox preservation and explains discrepancies in the literature. Synthetic laboratory preservation experiments and time stability experiments were conducted for natural water samples from several field sites. Any field collection procedure that filters out microorganisms, adds a reagent that prevents dissolved Fe and Mn oxidation and precipitation, and isolates the sample from solar radiation will preserve the As(III/V) ratio. Reagents that prevent Fe and Mn oxidation and precipitation include HCl, H 2SO4, and EDTA, although extremely high concentrations of EDTA are necessary for some water samples high in Fe. Photo-catalyzed Fe(III) reduction causes As(III) oxidation; however, storing the sample in the dark prevents photochemical reactions. Furthermore, the presence of Fe(II) or SO 4 inhibits the oxidation of As(III) by Fe(III) because of complexation reactions and competing reactions with free radicals. Consequently, fast abiotic As(III) oxidation reactions observed in the laboratory are not observed in natural water samples for one or more of the following reasons: (1) the As redox species have already stabilized, (2) most natural waters contain very low dissolved Fe(III) concentrations, (3) the As(III) oxidation caused by Fe(III) photoreduction is inhibited by Fe(II) or SO4.","language":"English","publisher":"Elseiver","doi":"10.1016/j.apgeochem.2004.01.003","issn":"08832927","usgsCitation":"McCleskey, R.B., Nordstrom, D.K., and Maest, A., 2004, Preservation of water samples for arsenic(III/V) determinations: An evaluation of the literature and new analytical results: Applied Geochemistry, v. 19, no. 7, p. 995-1009, https://doi.org/10.1016/j.apgeochem.2004.01.003.","productDescription":"15 p.","startPage":"995","endPage":"1009","costCenters":[{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":235509,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":209237,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/j.apgeochem.2004.01.003"}],"volume":"19","issue":"7","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a8b52e4b0c8380cd7e1fb","contributors":{"authors":[{"text":"McCleskey, R. Blaine 0000-0002-2521-8052 rbmccles@usgs.gov","orcid":"https://orcid.org/0000-0002-2521-8052","contributorId":147399,"corporation":false,"usgs":true,"family":"McCleskey","given":"R.","email":"rbmccles@usgs.gov","middleInitial":"Blaine","affiliations":[{"id":438,"text":"National Research Program - Western Branch","active":true,"usgs":true},{"id":503,"text":"Office of Water Quality","active":true,"usgs":true},{"id":5044,"text":"National Research Program - Central Branch","active":true,"usgs":true}],"preferred":true,"id":411736,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Nordstrom, D. Kirk 0000-0003-3283-5136 dkn@usgs.gov","orcid":"https://orcid.org/0000-0003-3283-5136","contributorId":749,"corporation":false,"usgs":true,"family":"Nordstrom","given":"D.","email":"dkn@usgs.gov","middleInitial":"Kirk","affiliations":[{"id":37277,"text":"WMA - Earth System Processes Division","active":true,"usgs":true},{"id":5044,"text":"National Research Program - Central Branch","active":true,"usgs":true}],"preferred":false,"id":411738,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Maest, A.S.","contributorId":86364,"corporation":false,"usgs":true,"family":"Maest","given":"A.S.","affiliations":[],"preferred":false,"id":411737,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}}
,{"id":70026973,"text":"70026973 - 2004 - 9000 years of salmon fishing on the Columbia River, North America","interactions":[],"lastModifiedDate":"2012-03-12T17:20:35","indexId":"70026973","displayToPublicDate":"2004-01-01T00:00:00","publicationYear":"2004","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3218,"text":"Quaternary Research","active":true,"publicationSubtype":{"id":10}},"title":"9000 years of salmon fishing on the Columbia River, North America","docAbstract":"A large assemblage of salmon bones excavated 50 yr ago from an ???10,000-yr-old archaeological site near The Dalles, Oregon, USA, has been the primary evidence that early native people along the Columbia River subsisted on salmon. Recent debate about the human role in creating the deposit prompted excavation of additional deposits and analysis of archaeologic, geologic, and hydrologic conditions at the site. Results indicate an anthropogenic source for most of the salmonid remains, which have associated radiocarbon dates indicating that the site was occupied as long ago as 9300 cal yr B.P. The abundance of salmon bone indicates that salmon was a major food item and suggests that migratory salmonids had well-established spawning populations in some parts of the Columbia Basin by 9300-8200 yr ago. ?? 2004 University of Washington. All rights reserved.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Quaternary Research","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1016/j.yqres.2004.03.002","issn":"00335894","usgsCitation":"Butler, V., and O’Connor, J.E., 2004, 9000 years of salmon fishing on the Columbia River, North America: Quaternary Research, v. 62, no. 1, p. 1-8, https://doi.org/10.1016/j.yqres.2004.03.002.","startPage":"1","endPage":"8","numberOfPages":"8","costCenters":[],"links":[{"id":209142,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/j.yqres.2004.03.002"},{"id":235360,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"62","issue":"1","noUsgsAuthors":false,"publicationDate":"2017-01-20","publicationStatus":"PW","scienceBaseUri":"5059e26fe4b0c8380cd45ba4","contributors":{"authors":[{"text":"Butler, V.L.","contributorId":55624,"corporation":false,"usgs":true,"family":"Butler","given":"V.L.","email":"","affiliations":[],"preferred":false,"id":411835,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"O’Connor, J. E.","contributorId":59489,"corporation":false,"usgs":true,"family":"O’Connor","given":"J.","email":"","middleInitial":"E.","affiliations":[],"preferred":false,"id":411836,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}}
,{"id":70026975,"text":"70026975 - 2004 - Degradates provide insight to spatial and temporal trends of herbicides in ground water","interactions":[],"lastModifiedDate":"2018-11-14T08:36:36","indexId":"70026975","displayToPublicDate":"2004-01-01T00:00:00","publicationYear":"2004","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3825,"text":"Groundwater","active":true,"publicationSubtype":{"id":10}},"title":"Degradates provide insight to spatial and temporal trends of herbicides in ground water","docAbstract":"<p>Since 1995, a network of municipal wells in Iowa, representing all major aquifer types (alluvial, bedrock/karst region, glacial drift, bedrock/nonkarst region), has been repeatedly sampled for a broad suite of herbicide compounds yielding one of the most comprehensive statewide databases of such compounds currently available in the United States. This dataset is ideal for documenting the insight that herbicide degradates provide to the spatial and temporal distribution of herbicides in ground water.</p>\n<p>During 2001, 86 municipal wells in Iowa were sampled and analyzed for 21 herbicide parent compounds and 24 herbicide degradates. The frequency of detection increased from 17% when only herbicide parent compounds were considered to 53% when both herbicide parents and degradates were considered. Thus, the transport of herbicide compounds to ground water is substantially underestimated when herbicide degradates are not considered. A significant difference in the results among the major aquifer types was apparent only when both herbicide parent compounds and their degradates were considered. In addition, including herbicide degradates greatly improved the statistical relation to the age of the water being sampled. When herbicide parent compounds are considered, only 40% of the wells lacking a herbicide detection could be explained by the age of the water predating herbicide use. However, when herbicide degradates were also considered, 80% of the ground water samples lacking a detection could be explained by the age of the water predating herbicide use. Finally, a temporal pattern in alachlor concentrations in ground water could only be identified when alachlor degradates were considered.</p>","language":"English","publisher":"Water Well Journal Publishing Company","doi":"10.1111/j.1745-6584.2004.tb02628.x","issn":"0017467X","usgsCitation":"Kolpin, D., Schnoebelen, D., and Thurman, E., 2004, Degradates provide insight to spatial and temporal trends of herbicides in ground water: Groundwater, v. 42, no. 4, p. 601-608, https://doi.org/10.1111/j.1745-6584.2004.tb02628.x.","productDescription":"8 p.","startPage":"601","endPage":"608","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[{"id":351,"text":"Iowa Water Science Center","active":true,"usgs":true},{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":235398,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":209164,"rank":9999,"type":{"id":10,"text":"Digital Object 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 \"}}]}","volume":"42","issue":"4","noUsgsAuthors":false,"publicationDate":"2005-12-13","publicationStatus":"PW","scienceBaseUri":"5059fe54e4b0c8380cd4ec91","contributors":{"authors":[{"text":"Kolpin, D.W.","contributorId":87565,"corporation":false,"usgs":true,"family":"Kolpin","given":"D.W.","email":"","affiliations":[],"preferred":false,"id":411840,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Schnoebelen, D.J.","contributorId":98352,"corporation":false,"usgs":true,"family":"Schnoebelen","given":"D.J.","affiliations":[],"preferred":false,"id":411841,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Thurman, E.M.","contributorId":102864,"corporation":false,"usgs":true,"family":"Thurman","given":"E.M.","affiliations":[],"preferred":false,"id":411842,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}}
,{"id":70027017,"text":"70027017 - 2004 - Radon (222Rn) in ground water of fractured rocks: A diffusion/ion exchange model","interactions":[],"lastModifiedDate":"2018-11-14T10:55:57","indexId":"70027017","displayToPublicDate":"2004-01-01T00:00:00","publicationYear":"2004","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1861,"text":"Ground Water","active":true,"publicationSubtype":{"id":10}},"title":"Radon (222Rn) in ground water of fractured rocks: A diffusion/ion exchange model","docAbstract":"<div class=\"abstract-group\"><div class=\"article-section__content en main\"><p>Ground waters from fractured igneous and high‐grade sialic metamorphic rocks frequently have elevated activity of dissolved radon (<sup>222</sup>Rn). A chemically based model is proposed whereby radium (<sup>226</sup>Ra) from the decay of uranium (<sup>238</sup>U) diffuses through the primary porosity of the rock to the water‐transmitting fracture where it is sorbed on weathering products. Sorption of<span>&nbsp;</span><sup>226</sup>Ra on the fracture surface maintains an activity gradient in the rock matrix, ensuring a continuous supply of<span>&nbsp;</span><sup>226</sup>Ra to fracture surfaces. As a result of the relatively long half‐life of<span>&nbsp;</span><sup>226</sup>Ra (1601 years), significant activity can accumulate on fracture surfaces. The proximity of this sorbed<span>&nbsp;</span><sup>226</sup>Ra to the active ground water flow system allows its decay progeny<span>&nbsp;</span><sup>222</sup>Rn to enter directly into the water. Laboratory analyses of primary porosity and diffusion coefficients of the rock matrix, radon emanation, and ion exchange at fracture surfaces are consistent with the requirements of a diffusion/ion‐exchange model. A dipole‐brine injection/withdrawal experiment conducted between bedrock boreholes in the high‐grade metamorphic and granite rocks at the Hubbard Brook Experimental Forest, Grafton County, New Hampshire, United States (42°56′N, 71°43′W) shows a large activity of<span>&nbsp;</span><sup>226</sup>Ra exchanged from fracture surfaces by a magnesium brine. The<span>&nbsp;</span><sup>226</sup>Ra activity removed by the exchange process is 34 times greater than that of<span>&nbsp;</span><sup>238</sup>U activity. These observations are consistent with the diffusion/ion‐exchange model. Elutriate isotopic ratios of<span>&nbsp;</span><sup>223</sup>Ra/<sup>226</sup>Ra and<span>&nbsp;</span><sup>238</sup>U/<sup>226</sup>Ra are also consistent with the proposed chemically based diffusion/ion‐exchange model.</p></div></div>","language":"English","publisher":"Wiley","doi":"10.1111/j.1745-6584.2004.tb02624.x","issn":"0017467X","usgsCitation":"Wood, W., Kraemer, T.F., and Shapiro, A., 2004, Radon (222Rn) in ground water of fractured rocks: A diffusion/ion exchange model: Ground Water, v. 42, no. 4, p. 552-567, https://doi.org/10.1111/j.1745-6584.2004.tb02624.x.","productDescription":"16 p.","startPage":"552","endPage":"567","costCenters":[{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":235548,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":209265,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1111/j.1745-6584.2004.tb02624.x"}],"volume":"42","issue":"4","noUsgsAuthors":false,"publicationDate":"2005-12-13","publicationStatus":"PW","scienceBaseUri":"505a9433e4b0c8380cd8126e","contributors":{"authors":[{"text":"Wood, W.W.","contributorId":21974,"corporation":false,"usgs":true,"family":"Wood","given":"W.W.","email":"","affiliations":[],"preferred":false,"id":412035,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Kraemer, T. F.","contributorId":63400,"corporation":false,"usgs":true,"family":"Kraemer","given":"T.","email":"","middleInitial":"F.","affiliations":[],"preferred":false,"id":412036,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Shapiro, A.","contributorId":8268,"corporation":false,"usgs":true,"family":"Shapiro","given":"A.","email":"","affiliations":[],"preferred":false,"id":412034,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}}
,{"id":70027020,"text":"70027020 - 2004 - Identifying areas of basin-floor recharge in the Trans-Pecos region and the link to vegetation","interactions":[],"lastModifiedDate":"2018-11-14T09:48:38","indexId":"70027020","displayToPublicDate":"2004-01-01T00:00:00","publicationYear":"2004","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2342,"text":"Journal of Hydrology","active":true,"publicationSubtype":{"id":10}},"title":"Identifying areas of basin-floor recharge in the Trans-Pecos region and the link to vegetation","docAbstract":"<div class=\"Abstracts\"><div id=\"aep-abstract-id12\" class=\"abstract author\"><div id=\"aep-abstract-sec-id13\"><p>Comparative water potential and chloride profiles (∼10 m deep) collected from four vegetation communities in the Trans-Pecos region of the Chihuahuan Desert were assessed to evaluate the potential for using vegetation patterns as a means of efficiently improving large-scale estimates of basin-floor recharge in semiarid and arid regions. Analytical solutions and multiphase flow and transport modeling constrained flux histories and current fluxes across the water table at each site. Chloride bulge profiles containing ∼12–15&nbsp;kyr of atmospheric deposition and long-term drying water potential profiles typified most desertscrub and grassland sites. In contrast, evidence of episodic sub-root zone percolation and chloride profiles containing &lt;250 yr of atmospheric deposition characterized the woodland site. The results suggested that the desertscrub and grassland areas support small upward fluxes across the water table (nonrecharge), whereas the woodland site supports significant downward fluxes across the water table (recharge). A nonrecharge–recharge transition was identified to be collocated with a grassland–woodland ecotone. The establishment of vegetation–recharge relationships such as this will improve estimates of basin-scale recharge by identifying regions where no recharge is expected and regions where recharge is expected and point measurements should be concentrated. An approach integrating remotely sensed spatial distributions of vegetation and indicator relationships to recharge is both timely and warranted, although several caveats, as revealed in this study, should be noted. For example, the relative importance and distribution of vertical conduits that permit percolation to the water table merits future investigation.</p></div></div></div>","language":"English","publisher":"Elsevier","doi":"10.1016/j.jhydrol.2003.12.029","usgsCitation":"Walvoord, M.A., and Phillips, F.M., 2004, Identifying areas of basin-floor recharge in the Trans-Pecos region and the link to vegetation: Journal of Hydrology, v. 292, no. 1-4, p. 59-74, https://doi.org/10.1016/j.jhydrol.2003.12.029.","productDescription":"16 p.","startPage":"59","endPage":"74","costCenters":[{"id":465,"text":"Nevada Water Science Center","active":true,"usgs":true},{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":235585,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"292","issue":"1-4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a3848e4b0c8380cd614ed","contributors":{"authors":[{"text":"Walvoord, Michelle Ann 0000-0003-4269-8366 walvoord@usgs.gov","orcid":"https://orcid.org/0000-0003-4269-8366","contributorId":147211,"corporation":false,"usgs":true,"family":"Walvoord","given":"Michelle","email":"walvoord@usgs.gov","middleInitial":"Ann","affiliations":[{"id":5044,"text":"National Research Program - Central Branch","active":true,"usgs":true}],"preferred":true,"id":412045,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Phillips, Fred M.","contributorId":57957,"corporation":false,"usgs":true,"family":"Phillips","given":"Fred","email":"","middleInitial":"M.","affiliations":[],"preferred":false,"id":412044,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}}
,{"id":70027058,"text":"70027058 - 2004 - Analysis of modern and Pleistocene hydrologic exchange between Saginaw Bay (Lake Huron) and the Saginaw Lowlands area","interactions":[],"lastModifiedDate":"2021-08-25T16:08:08.572647","indexId":"70027058","displayToPublicDate":"2004-01-01T00:00:00","publicationYear":"2004","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1786,"text":"Geological Society of America Bulletin","active":true,"publicationSubtype":{"id":10}},"title":"Analysis of modern and Pleistocene hydrologic exchange between Saginaw Bay (Lake Huron) and the Saginaw Lowlands area","docAbstract":"<p>Two numerical models, one simulating present groundwater flow conditions and one simulating ice-induced hydraulic loading from the Port Huron ice advance, were used to characterize both modern and Pleistocene groundwater exchange between the Michigan Basin and near-surface water systems of Saginaw Bay (Lake Huron) and the surrounding Saginaw Lowlands area. These models were further used to constrain the origin of saline, isotopically light groundwater, and porewater from the study area. Output from the groundwater-flow model indicates that, at present conditions, head in the Marshall aquifer beneath Saginaw Bay exceeds the modern lake elevation by as much as 21 m. Despite this potential for flow, simulated ground-water discharge through the Saginaw Bay floor constitutes only 0.028 m<sup>3</sup><span>&nbsp;</span>s<sup>−1</sup><span>&nbsp;</span>(∼1 cfs). Bedrock lithology appears to regulate the rate of groundwater discharge, as the portion of the Saginaw Bay floor underlain by the Michigan confining unit exhibits an order of magnitude lower flux than the portion underlain by the Saginaw aquifer. The calculated shoreline discharge of groundwater to Saginaw Bay is also relatively small (1.13 m<sup>3</sup><span>&nbsp;</span>s<sup>−1</sup><span>&nbsp;</span>or ∼40 cfs) because of low gradients across the Saginaw Lowlands area and the low hydraulic conductivities of lodgement tills and glacial-lake clays surrounding the bay.</p><p>In contrast to the present groundwater flow conditions, the Port Huron ice-induced hydraulic-loading model generates a groundwater-flow reversal that is localized to the region of a Pleistocene ice sheet and proglacial lake. This area of reversed vertical gradient is largely commensurate with the distribution of isotopically light groundwater presently found in the study area. Mixing scenarios, constrained by chloride concentrations and δ<sup>18</sup>O values in porewater samples, demonstrate that a mixing event involving subglacial recharge could have produced the groundwater chemistry currently observed in the Saginaw Lowlands area. The combination of models and mixing scenarios indicates that structural control is a major influence on both the present and Pleistocene flow systems.</p>","language":"English","publisher":"GeoScienceWorld","doi":"10.1130/B25290.1","usgsCitation":"Hoaglund, J., Kolak, J., Long, D., and Larson, G., 2004, Analysis of modern and Pleistocene hydrologic exchange between Saginaw Bay (Lake Huron) and the Saginaw Lowlands area: Geological Society of America Bulletin, v. 116, no. 1-2, p. 3-15, https://doi.org/10.1130/B25290.1.","productDescription":"13 p.","startPage":"3","endPage":"15","costCenters":[{"id":255,"text":"Energy Resources Program","active":true,"usgs":true}],"links":[{"id":235623,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Michigan","otherGeospatial":"Saginaw Bay, Saginaw Lowlands","geographicExtents":"{\n  \"type\": \"FeatureCollection\",\n  \"features\": [\n    {\n      \"type\": \"Feature\",\n      \"properties\": {},\n      \"geometry\": {\n        \"type\": \"Polygon\",\n        \"coordinates\": [\n          [\n            [\n              -83.7322998046875,\n              44.12308489306967\n            ],\n            [\n              -83.968505859375,\n              43.909765943908\n            ],\n            [\n              -84.0399169921875,\n              43.61619382369185\n            ],\n            [\n              -83.91357421875,\n              43.520671902437606\n            ],\n            [\n              -83.6553955078125,\n              43.55651037504758\n            ],\n            [\n              -83.375244140625,\n              43.73538317799622\n            ],\n            [\n              -83.18298339843749,\n              43.92559366355069\n            ],\n            [\n              -82.891845703125,\n              44.05601169578525\n            ],\n            [\n              -83.1170654296875,\n              44.25700308645885\n            ],\n            [\n              -83.6279296875,\n              44.33956524809713\n            ],\n            [\n              -83.7322998046875,\n              44.12308489306967\n            ]\n          ]\n        ]\n      }\n    }\n  ]\n}","volume":"116","issue":"1-2","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059eb21e4b0c8380cd48c3f","contributors":{"authors":[{"text":"Hoaglund, J. R. III","contributorId":58423,"corporation":false,"usgs":true,"family":"Hoaglund","given":"J. R.","suffix":"III","affiliations":[],"preferred":false,"id":412160,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Kolak, J.J.","contributorId":46246,"corporation":false,"usgs":true,"family":"Kolak","given":"J.J.","email":"","affiliations":[],"preferred":false,"id":412159,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Long, D.T.","contributorId":67930,"corporation":false,"usgs":true,"family":"Long","given":"D.T.","email":"","affiliations":[],"preferred":false,"id":412161,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Larson, G.J.","contributorId":89680,"corporation":false,"usgs":true,"family":"Larson","given":"G.J.","email":"","affiliations":[],"preferred":false,"id":412162,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}}
,{"id":70027084,"text":"70027084 - 2004 - Albert H. Munsell: A sense of color at the interface of art and science","interactions":[],"lastModifiedDate":"2018-11-14T08:43:36","indexId":"70027084","displayToPublicDate":"2004-01-01T00:00:00","publicationYear":"2004","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3419,"text":"Soil Science","active":true,"publicationSubtype":{"id":10}},"title":"Albert H. Munsell: A sense of color at the interface of art and science","docAbstract":"The color theory conceived and commercialized by Albert H. Munsell (1858-1918) has become a universal part of the lexicon of soil science. An American painter noted for his seascapes and portraits, he had a long-standing interest in the description of color. Munsell began studies aimed at standardizing color description, using hue, value, and chroma scales, around 1898. His landmark treatise, \"A Color Notation,\" was published in 1905. Munsell died about 30 years before his color charts came into wide-spread use in soil survey programs in the United States. Dorothy Nickerson, who began her career as secretary and laboratory assistant to Munsell's son, and later spent 37 years at USDA as a color-science specialist, did much to adapt the Munsell Color System to soil-color usage. The legacy of color research pioneered by A.H. Munsell is honored today by the Munsell Color Science Laboratory established in 1983 at the Rochester Institute of Technology.","language":"English","publisher":"Ovid","doi":"10.1097/01.ss.0000117789.98510.30","issn":"0038075X","usgsCitation":"Landa, E.R., 2004, Albert H. Munsell: A sense of color at the interface of art and science: Soil Science, v. 169, no. 2, p. 83-89, https://doi.org/10.1097/01.ss.0000117789.98510.30.","productDescription":"7 p.","startPage":"83","endPage":"89","costCenters":[{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":235481,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"169","issue":"2","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059e954e4b0c8380cd481ed","contributors":{"authors":[{"text":"Landa, E. R.","contributorId":100002,"corporation":false,"usgs":true,"family":"Landa","given":"E.","email":"","middleInitial":"R.","affiliations":[],"preferred":false,"id":412294,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}}
,{"id":70027115,"text":"70027115 - 2004 - Drainage effects on stream nitrate-N and hydrology in south-central Minnesota (USA)","interactions":[],"lastModifiedDate":"2012-03-12T17:20:26","indexId":"70027115","displayToPublicDate":"2004-01-01T00:00:00","publicationYear":"2004","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1552,"text":"Environmental Monitoring and Assessment","onlineIssn":"1573-2959","printIssn":"0167-6369","active":true,"publicationSubtype":{"id":10}},"title":"Drainage effects on stream nitrate-N and hydrology in south-central Minnesota (USA)","docAbstract":"Excessive nitrate-N in south-central Minnesota ditches and streams is related to land-use change, and may be contributing to the development of the zone of hypoxia in the Gulf of Mexico. Intensive land-use (agricultural management) has progressively increased as subsurface drainage has improved crop productivity over the past 25 years. We have examined water at varying scales for ??18O and, nitrate-N concentrations. Additionally, analysis of annual peak flows, and channel geomorphic features provided a measure of hydrologic change. Laboratory and field results indicate that agricultural drainage has influenced riverine source waters, concentrations of nitrate-N, channel dimensions and hydrology in the Blue Earth River (BER) Basin. At the mouth of the BER shallow ground water comprises the largest source water component. The highest nitrate-N concentrations in the BER and tributaries typically occurred in May and June and ranged from 7-34 mg L-1. Peak flows for the 1.01-2-yr recurrence intervals increased by 20-to-206% over the past 25 years. Geomorphic data suggest that small channels (ditches) were entrenched by design, whereas, natural channels incised. Increased frequent peak flows in the BER have created laterally confined channels that are disconnected from an accessible riparian corridor. Frequent access to a functioning riparian zone is important for denitrification.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Environmental Monitoring and Assessment","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1023/B:EMAS.0000009235.50413.42","issn":"01676369","usgsCitation":"Magner, J., Payne, G.A., and Steffen, J., 2004, Drainage effects on stream nitrate-N and hydrology in south-central Minnesota (USA): Environmental Monitoring and Assessment, v. 91, no. 1-3, p. 183-198, https://doi.org/10.1023/B:EMAS.0000009235.50413.42.","startPage":"183","endPage":"198","numberOfPages":"16","costCenters":[],"links":[{"id":209225,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1023/B:EMAS.0000009235.50413.42"},{"id":235483,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"91","issue":"1-3","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a03d0e4b0c8380cd5066f","contributors":{"authors":[{"text":"Magner, J.A.","contributorId":26413,"corporation":false,"usgs":true,"family":"Magner","given":"J.A.","email":"","affiliations":[],"preferred":false,"id":412398,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Payne, G. A.","contributorId":62190,"corporation":false,"usgs":true,"family":"Payne","given":"G.","email":"","middleInitial":"A.","affiliations":[],"preferred":false,"id":412399,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Steffen, J.","contributorId":93679,"corporation":false,"usgs":true,"family":"Steffen","given":"J.","email":"","affiliations":[],"preferred":false,"id":412400,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}}
,{"id":70027120,"text":"70027120 - 2004 - Influence of natural organic matter source on copper speciation as demonstrated by Cu binding to fish gills, by ion selective electrode, and by DGT gel sampler","interactions":[],"lastModifiedDate":"2017-08-29T16:41:09","indexId":"70027120","displayToPublicDate":"2004-01-01T00:00:00","publicationYear":"2004","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1565,"text":"Environmental Science & Technology","onlineIssn":"1520-5851","printIssn":"0013-936X","active":true,"publicationSubtype":{"id":10}},"title":"Influence of natural organic matter source on copper speciation as demonstrated by Cu binding to fish gills, by ion selective electrode, and by DGT gel sampler","docAbstract":"<p><span>Rainbow trout (</span><i>Oncorhynchus mykiss</i><span>, 2 g) were exposed to 0−5 μM total copper in ion-poor water for 3 h in the presence or absence of 10 mg C/L of qualitatively different natural organic matter (NOM) derived from water spanning a large gradient in hydrologic residence time. Accumulation of Cu by trout gills was compared to Cu speciation determined by ion selective electrode (ISE) and by diffusive gradients in thin films (DGT) gel sampler technology. The presence of NOM decreased Cu uptake by trout gills as well as Cu concentrations determined by ISE and DGT. Furthermore, the source of NOM influenced Cu binding by trout gills with high-color, allochthonous NOM decreasing Cu accumulation by the gills more than low-color autochthonous NOM. The pattern of Cu binding to the NOM measured by Cu ISE and by Cu accumulation by DGT samplers was similar to the fish gill results. A simple Cu−gill binding model required an NOM Cu-binding factor (</span><i>F</i><span>) that depended on NOM quality to account for observed Cu accumulation by trout gills; values of<span>&nbsp;</span></span><i>F</i><span><span>&nbsp;</span>varied by a factor of 2. Thus, NOM metal-binding quality, as well as NOM quantity, are both important when assessing the bioavailability of metals such as Cu to aquatic organisms.</span></p>","language":"English","publisher":"ACS Publications","doi":"10.1021/es030566y","usgsCitation":"Luider, C., Crusius, J., Playle, R., and Curtis, P., 2004, Influence of natural organic matter source on copper speciation as demonstrated by Cu binding to fish gills, by ion selective electrode, and by DGT gel sampler: Environmental Science & Technology, v. 38, no. 10, p. 2865-2872, https://doi.org/10.1021/es030566y.","productDescription":"8 p.","startPage":"2865","endPage":"2872","costCenters":[],"links":[{"id":235556,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"38","issue":"10","noUsgsAuthors":false,"publicationDate":"2004-04-17","publicationStatus":"PW","scienceBaseUri":"505a3b5ce4b0c8380cd6246d","contributors":{"authors":[{"text":"Luider, C.D.","contributorId":108298,"corporation":false,"usgs":true,"family":"Luider","given":"C.D.","email":"","affiliations":[],"preferred":false,"id":412420,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Crusius, John 0000-0003-2554-0831 jcrusius@usgs.gov","orcid":"https://orcid.org/0000-0003-2554-0831","contributorId":2155,"corporation":false,"usgs":true,"family":"Crusius","given":"John","email":"jcrusius@usgs.gov","affiliations":[{"id":119,"text":"Alaska Science Center Geology Minerals","active":true,"usgs":true},{"id":114,"text":"Alaska Science Center","active":true,"usgs":true}],"preferred":true,"id":412418,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Playle, R.C.","contributorId":98092,"corporation":false,"usgs":true,"family":"Playle","given":"R.C.","email":"","affiliations":[],"preferred":false,"id":412419,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Curtis, P.J.","contributorId":23737,"corporation":false,"usgs":true,"family":"Curtis","given":"P.J.","email":"","affiliations":[],"preferred":false,"id":412417,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}}
,{"id":70027123,"text":"70027123 - 2004 - Observed and simulated ground motions in the San Bernardino basin region for the Hector Mine, California, earthquake","interactions":[],"lastModifiedDate":"2021-07-12T11:42:23.731087","indexId":"70027123","displayToPublicDate":"2004-01-01T00:00:00","publicationYear":"2004","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1135,"text":"Bulletin of the Seismological Society of America","onlineIssn":"1943-3573","printIssn":"0037-1106","active":true,"publicationSubtype":{"id":10}},"title":"Observed and simulated ground motions in the San Bernardino basin region for the Hector Mine, California, earthquake","docAbstract":"During the MW 7.1 Hector Mine earthquake, peak ground velocities recorded at sites in the central San Bernardino basin region were up to 2 times larger and had significantly longer durations of strong shaking than sites just outside the basin. To better understand the effects of 3D structure on the long-period ground-motion response in this region, we have performed finite-difference simulations for this earthquake. The simulations are numerically accurate for periods of 2 sec and longer and incorporate the detailed spatial and temporal heterogeneity of source rupture, as well as complex 3D basin structure. Here, we analyze three models of the San Bernardino basin: model A (with structural constraints from gravity and seismic reflection data), model F (water well and seismic refraction data), and the Southern California Earthquake Center version 3 model (hydrologic and seismic refraction data). Models A and F are characterized by a gradual increase in sediment thickness toward the south with an abrupt step-up in the basement surface across the San Jacinto fault. The basin structure in the SCEC version 3 model has a nearly uniform sediment thickness of 1 km with little basement topography along the San Jacinto fault. In models A and F, we impose a layered velocity structure within the sediments based on the seismic refraction data and an assumed depth-dependent Vp/Vs ratio. Sediment velocities within the SCEC version 3 model are given by a smoothly varying rule-based function that is calibrated to the seismic refraction measurements. Due to computational limitations, the minimum shear-wave velocity is fixed at 600 m/sec in all of the models. Ground-motion simulations for both models A and F provide a reasonably good match to the amplitude and waveform characteristics of the recorded motions. In these models, surface waves are generated as energy enters the basin through the gradually sloping northern margin. Due to the basement step along the San Jacinto fault, the surface wave energy is confined to the region north of this structure, consistent with the observations. The SCEC version 3 model, lacking the basin geometry complexity present in the other two models, fails to provide a satisfactory match to the characteristics of the observed motions. Our study demonstrates the importance of using detailed and accurate basin geometry for predicting ground motions and also highlights the utility of integrating geological, geophysical, and seismological observations in the development and validation of 3D velocity models.","language":"English","publisher":"Seismological Society of America","doi":"10.1785/0120030025","usgsCitation":"Graves, R., and Wald, D., 2004, Observed and simulated ground motions in the San Bernardino basin region for the Hector Mine, California, earthquake: Bulletin of the Seismological Society of America, v. 94, no. 1, p. 131-146, https://doi.org/10.1785/0120030025.","productDescription":"16 p.","startPage":"131","endPage":"146","costCenters":[{"id":237,"text":"Earthquake Science Center","active":true,"usgs":true}],"links":[{"id":235627,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"California","otherGeospatial":"San Bernardino basin","geographicExtents":"{\n  \"type\": \"FeatureCollection\",\n  \"features\": [\n    {\n      \"type\": \"Feature\",\n      \"properties\": {},\n      \"geometry\": {\n        \"type\": \"Polygon\",\n        \"coordinates\": [\n          [\n            [\n              -117.333984375,\n              33.94335994657882\n            ],\n            [\n              -114.47753906249999,\n              33.687781758439364\n            ],\n            [\n              -114.2138671875,\n              34.27083595165\n            ],\n            [\n              -114.5654296875,\n              34.77771580360469\n            ],\n            [\n              -115.3564453125,\n              35.639441068973944\n            ],\n            [\n              -116.6748046875,\n              35.746512259918504\n            ],\n            [\n              -117.333984375,\n              33.94335994657882\n            ]\n          ]\n        ]\n      }\n    }\n  ]\n}","volume":"94","issue":"1","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a6ae9e4b0c8380cd743fd","contributors":{"authors":[{"text":"Graves, R.W. 0000-0001-9758-453X","orcid":"https://orcid.org/0000-0001-9758-453X","contributorId":77691,"corporation":false,"usgs":true,"family":"Graves","given":"R.W.","affiliations":[],"preferred":false,"id":412429,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Wald, D.J. 0000-0002-1454-4514","orcid":"https://orcid.org/0000-0002-1454-4514","contributorId":43809,"corporation":false,"usgs":true,"family":"Wald","given":"D.J.","affiliations":[],"preferred":false,"id":412428,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}}
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