No abstract available.
\nReview info: Pelagic nutrient cycles: Herbivores as sources and sinks. By Tom Andersen, 1997. ISBN: 3540618813, 280 pp.
","language":"English","publisher":"Elsevier","doi":"10.1016/S0169-5347(97)83363-0","usgsCitation":"DeAngelis, D., 1998, Nutrients, algae, and grazers - Book review: Pelagic nutrient cycles: Herbivores as sources and sinks: Trends in Ecology and Evolution, v. 13, no. 3, https://doi.org/10.1016/S0169-5347(97)83363-0.","productDescription":"1 p.","startPage":"127","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[{"id":566,"text":"Southeast Ecological Science Center","active":true,"usgs":true}],"links":[{"id":314782,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"13","issue":"3","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"56a75545e4b0b28f1184d7d4","contributors":{"authors":[{"text":"DeAngelis, Donald L. 0000-0002-1570-4057 don_deangelis@usgs.gov","orcid":"https://orcid.org/0000-0002-1570-4057","contributorId":147289,"corporation":false,"usgs":true,"family":"DeAngelis","given":"Donald L.","email":"don_deangelis@usgs.gov","affiliations":[{"id":566,"text":"Southeast Ecological Science Center","active":true,"usgs":true}],"preferred":false,"id":589643,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70174676,"text":"70174676 - 1998 - Using geostatistical methods to estimate snow water equivalence distribution in a mountain watershed","interactions":[],"lastModifiedDate":"2018-02-21T16:00:21","indexId":"70174676","displayToPublicDate":"1999-01-01T00:00:00","publicationYear":"1998","noYear":false,"publicationType":{"id":24,"text":"Conference Paper"},"publicationSubtype":{"id":19,"text":"Conference Paper"},"title":"Using geostatistical methods to estimate snow water equivalence distribution in a mountain watershed","docAbstract":"Knowledge of the spatial distribution of snow water equivalence (SWE) is necessary to adequately forecast the volume and timing of snowmelt runoff. In April 1997, peak accumulation snow depth and density measurements were independently taken in the Loch Vale watershed (6.6 km2), Rocky Mountain National Park, Colorado. Geostatistics and classical statistics were used to estimate SWE distribution across the watershed. Snow depths were spatially distributed across the watershed through kriging interpolation methods which provide unbiased estimates that have minimum variances. Snow densities were spatially modeled through regression analysis. Combining the modeled depth and density with snow-covered area (SCA produced an estimate of the spatial distribution of SWE. The kriged estimates of snow depth explained 37-68% of the observed variance in the measured depths. Steep slopes, variably strong winds, and complex energy balance in the watershed contribute to a large degree of heterogeneity in snow depth.
","largerWorkType":{"id":24,"text":"Conference Paper"},"largerWorkTitle":"Proceedings of the 66th Annual Western Snow Conference","largerWorkSubtype":{"id":19,"text":"Conference Paper"},"conferenceTitle":"Western Snow Conference","conferenceDate":"April 1998","conferenceLocation":"Snowbird, UT","language":"English","publisher":"Western Snow Conference","usgsCitation":"Balk, B., Elder, K., and Baron, J., 1998, Using geostatistical methods to estimate snow water equivalence distribution in a mountain watershed, in Proceedings of the 66th Annual Western Snow Conference, Snowbird, UT, April 1998, p. 100-111.","productDescription":"12 p.","startPage":"100","endPage":"111","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[{"id":291,"text":"Fort Collins Science Center","active":true,"usgs":true}],"links":[{"id":325245,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":325244,"rank":1,"type":{"id":15,"text":"Index Page"},"url":"https://www.westernsnowconference.org/node/238"}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5788b7c0e4b0d27deb387044","contributors":{"authors":[{"text":"Balk, B.","contributorId":172899,"corporation":false,"usgs":false,"family":"Balk","given":"B.","email":"","affiliations":[],"preferred":false,"id":642470,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Elder, K.","contributorId":94639,"corporation":false,"usgs":true,"family":"Elder","given":"K.","email":"","affiliations":[],"preferred":false,"id":642471,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"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":642472,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":95366,"text":"95366 - 1998 - Management of a large carnivore: Black bear","interactions":[],"lastModifiedDate":"2022-12-16T16:49:53.736361","indexId":"95366","displayToPublicDate":"1999-01-01T00:00:00","publicationYear":"1998","noYear":false,"publicationType":{"id":5,"text":"Book chapter"},"publicationSubtype":{"id":24,"text":"Book Chapter"},"chapter":"10","title":"Management of a large carnivore: Black bear","docAbstract":"No abstract available.
","largerWorkType":{"id":4,"text":"Book"},"largerWorkTitle":"Ecosystem management for sustainability: Principles and practices illustrated by a regional biosphere reserve cooperative","largerWorkSubtype":{"id":15,"text":"Monograph"},"language":"English","publisher":"CRC Press","usgsCitation":"Clark, J.D., and Pelton, M.R., 1998, Management of a large carnivore: Black bear, chap. 10 of Ecosystem management for sustainability: Principles and practices illustrated by a regional biosphere reserve cooperative, p. 209-223.","productDescription":"15 p.","startPage":"209","endPage":"223","numberOfPages":"15","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[{"id":365,"text":"Leetown Science Center","active":true,"usgs":true},{"id":481,"text":"Northern Rocky Mountain Science Center","active":true,"usgs":true}],"links":[{"id":127296,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4a81e4b07f02db64a27f","contributors":{"editors":[{"text":"Peine, John D.","contributorId":82020,"corporation":false,"usgs":true,"family":"Peine","given":"John","email":"","middleInitial":"D.","affiliations":[],"preferred":false,"id":505567,"contributorType":{"id":2,"text":"Editors"},"rank":1}],"authors":[{"text":"Clark, Joseph D. 0000-0002-8547-8112 jclark1@usgs.gov","orcid":"https://orcid.org/0000-0002-8547-8112","contributorId":2265,"corporation":false,"usgs":true,"family":"Clark","given":"Joseph","email":"jclark1@usgs.gov","middleInitial":"D.","affiliations":[{"id":365,"text":"Leetown Science Center","active":true,"usgs":true},{"id":481,"text":"Northern Rocky Mountain Science Center","active":true,"usgs":true}],"preferred":true,"id":298962,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Pelton, Michael R.","contributorId":168689,"corporation":false,"usgs":false,"family":"Pelton","given":"Michael","email":"","middleInitial":"R.","affiliations":[{"id":7006,"text":"Department of Forestry, Wildlife and Fisheries, University of Tennessee","active":true,"usgs":false}],"preferred":false,"id":298961,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70156314,"text":"70156314 - 1998 - Metal trends and effects in Potamocorbula amurensis in north San Francisco Bay","interactions":[],"lastModifiedDate":"2020-04-10T17:46:34.777787","indexId":"70156314","displayToPublicDate":"1999-01-01T00:00:00","publicationYear":"1998","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3914,"text":"Interagency Ecological Program Newsletter","active":true,"publicationSubtype":{"id":10}},"title":"Metal trends and effects in Potamocorbula amurensis in north San Francisco Bay","docAbstract":"No abstract available.
","language":"English","publisher":"Interagency Ecological Program for the San Francisco Estuary","usgsCitation":"Brown, C.L., and Luoma, S.N., 1998, Metal trends and effects in Potamocorbula amurensis in north San Francisco Bay: Interagency Ecological Program Newsletter, v. 11, no. 2, p. 33-35.","productDescription":"3 p.","startPage":"33","endPage":"35","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[{"id":552,"text":"San Francisco Bay-Delta","active":false,"usgs":true},{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true},{"id":5079,"text":"Pacific Regional Director's Office","active":true,"usgs":true}],"links":[{"id":308180,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"California","otherGeospatial":"San Francisco Bay","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -122.3272705078125,\n 38.034030762875844\n ],\n [\n -122.3272705078125,\n 38.09241741843045\n ],\n [\n -121.87683105468749,\n 38.09241741843045\n ],\n [\n -121.87683105468749,\n 38.034030762875844\n ],\n [\n -122.3272705078125,\n 38.034030762875844\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"11","issue":"2","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"55fa92c2e4b05d6c4e501aa5","contributors":{"authors":[{"text":"Brown, Cynthia L. clbrown@usgs.gov","contributorId":206,"corporation":false,"usgs":true,"family":"Brown","given":"Cynthia","email":"clbrown@usgs.gov","middleInitial":"L.","affiliations":[{"id":438,"text":"National Research Program - Western Branch","active":true,"usgs":true}],"preferred":true,"id":568650,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Luoma, Samuel N. 0000-0001-5443-5091 snluoma@usgs.gov","orcid":"https://orcid.org/0000-0001-5443-5091","contributorId":2287,"corporation":false,"usgs":true,"family":"Luoma","given":"Samuel","email":"snluoma@usgs.gov","middleInitial":"N.","affiliations":[{"id":438,"text":"National Research Program - Western Branch","active":true,"usgs":true}],"preferred":true,"id":568651,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":95399,"text":"95399 - 1998 - Species repatriation: Red wolf","interactions":[],"lastModifiedDate":"2022-12-16T16:51:37.515559","indexId":"95399","displayToPublicDate":"1999-01-01T00:00:00","publicationYear":"1998","noYear":false,"publicationType":{"id":5,"text":"Book chapter"},"publicationSubtype":{"id":24,"text":"Book Chapter"},"chapter":"11","title":"Species repatriation: Red wolf","docAbstract":"No abstract available.
","largerWorkType":{"id":4,"text":"Book"},"largerWorkTitle":"Ecosystem management for sustainability: Principles and practices illustrated by a regional biosphere reserve cooperative","largerWorkSubtype":{"id":15,"text":"Monograph"},"language":"English","publisher":"CRC Press","usgsCitation":"Lucash, C.F., Crawford, B.A., and Clark, J.D., 1998, Species repatriation: Red wolf, chap. 11 of Ecosystem management for sustainability: Principles and practices illustrated by a regional biosphere reserve cooperative, p. 225-246.","productDescription":"22 p.","startPage":"225","endPage":"246","numberOfPages":"22","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[{"id":365,"text":"Leetown Science Center","active":true,"usgs":true},{"id":481,"text":"Northern Rocky Mountain Science Center","active":true,"usgs":true}],"links":[{"id":127469,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e49e4e4b07f02db5e5eee","contributors":{"editors":[{"text":"Peine, John D.","contributorId":82020,"corporation":false,"usgs":true,"family":"Peine","given":"John","email":"","middleInitial":"D.","affiliations":[],"preferred":false,"id":505638,"contributorType":{"id":2,"text":"Editors"},"rank":1}],"authors":[{"text":"Lucash, C. F.","contributorId":39314,"corporation":false,"usgs":true,"family":"Lucash","given":"C.","email":"","middleInitial":"F.","affiliations":[],"preferred":false,"id":299052,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Crawford, B. A.","contributorId":8027,"corporation":false,"usgs":true,"family":"Crawford","given":"B.","email":"","middleInitial":"A.","affiliations":[],"preferred":false,"id":299051,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Clark, J. D.","contributorId":85911,"corporation":false,"usgs":true,"family":"Clark","given":"J.","email":"","middleInitial":"D.","affiliations":[],"preferred":false,"id":299053,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70022035,"text":"70022035 - 1998 - Recovery and validation of historical sediment quality data from coastal and estuarine areas: An integrated approach","interactions":[],"lastModifiedDate":"2018-06-07T11:43:51","indexId":"70022035","displayToPublicDate":"1999-01-01T00:00:00","publicationYear":"1998","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2302,"text":"Journal of Geochemical Exploration","active":true,"publicationSubtype":{"id":10}},"title":"Recovery and validation of historical sediment quality data from coastal and estuarine areas: An integrated approach","docAbstract":"A comprehensive database of sediment chemistry and environmental parameters has been compiled for Boston Harbor and Massachusetts Bay. This work illustrates methodologies for rescuing and validating sediment data from heterogeneous historical sources. It greatly expands spatial and temporal data coverage of estuarine and coastal sediments. The database contains about 3500 samples containing inorganic chemical, organic, texture and other environmental data dating from 1955 to 1994. Cooperation with local and federal agencies as well as universities was essential in locating and screening documents for the database. More than 80% of references utilized came from sources with limited distribution (gray literature). Task sharing was facilitated by a comprehensive and clearly defined data dictionary for sediments. It also served as a data entry template and flat file format for data processing and as a basis for interpretation and graphical illustration. Standard QA/QC protocols are usually inapplicable to historical sediment data. In this work outliers and data quality problems were identified by batch screening techniques that also provide visualizations of data relationships and geochemical affinities. No data were excluded, but qualifying comments warn users of problem data. For Boston Harbor, the proportion of irreparable or seriously questioned data was remarkably small (<5%), although concentration values for metals and organic contaminants spanned 3 orders of magnitude for many elements or compounds. Data from the historical database provide alternatives to dated cores for measuring changes in surficial sediment contamination level with time. The data indicate that spatial inhomogeneity in harbor environments can be large with respect to sediment-hosted contaminants. Boston Inner Harbor surficial sediments showed decreases in concentrations of Cu, Hg, and Zn of 40 to 60% over a 17-year period.A comprehensive database of sediment chemistry and environmental parameters has been compiled for Boston Harbor and Massachusetts Bay. This work illustrates methodologies for rescuing and validating sediment data from heterogeneous historical sources. It greatly expands spatial and temporal data coverage of estuarine and coastal sediments. The database contains about 3500 samples containing inorganic chemical, organic, texture and other environmental data dating from 1995 to 1994. Cooperation with local and federal agencies as well as universities was essential in locating and screening documents for the database. More than 80% of references utilized came from sources with limited distribution (gray Task sharing was facilitated by a comprehensive and clearly defined data dictionary for sediments. It also served as a data entry template and flat file format for data processing and as a basis for interpretation and graphical illustration. Standard QA/QC protocols are usually inapplicable to historical sediment data. In this work outliers and data quality problems were identified by batch screening techniques that also provide visualizations of data relationships and geochemical affinities. No data were excluded, but qualifying comments warn users of problem data. For Boston Harbor, the proportion of irreparable or seriously questioned data was remarkably small (<5%), although concentration values for metals and organic contaminants spanned 3 orders of magnitude for many elements or compounds. Data from the historical database provide alternatives to dated cores for measuring changes in surficial sediment contamination level with time. The data indicate that spatial inhomogeneity in harbor environments can be large with respect to sediment-hosted contaminants. Boston Inner Harbor surficial sediments showed decreases in concentrations Cu, Hg, and Zn of 40 to 60% over a 17-year period.","conferenceTitle":"Proceedings of the 4th International Symposium on Environmental Geochemistry","conferenceDate":"October 5-10, 1997","conferenceLocation":"Vail, CO","language":"English","publisher":"Elsevier","publisherLocation":"Amsterdam, Netherlands","doi":"10.1016/S0375-6742(98)00044-2","issn":"03756742","usgsCitation":"Manheim, F., Buchholtz ten Brink, M.R., and Mecray, E., 1998, Recovery and validation of historical sediment quality data from coastal and estuarine areas: An integrated approach: Journal of Geochemical Exploration, v. 64, no. 1-3, p. 377-393, https://doi.org/10.1016/S0375-6742(98)00044-2.","productDescription":"17 p.","startPage":"377","endPage":"393","costCenters":[{"id":678,"text":"Woods Hole Coastal and Marine Science Center","active":true,"usgs":true}],"links":[{"id":479687,"rank":10000,"type":{"id":41,"text":"Open Access External Repository Page"},"url":"http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.559.9084","text":"External Repository"},{"id":230357,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":206602,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/S0375-6742(98)00044-2"}],"country":"United States","state":"Massachusetts","otherGeospatial":"Boston Harbor","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -71.06918334960938,\n 42.22648356137063\n ],\n [\n -70.59402465820312,\n 42.22648356137063\n ],\n [\n -70.59402465820312,\n 42.56117285531808\n ],\n [\n -71.06918334960938,\n 42.56117285531808\n ],\n [\n -71.06918334960938,\n 42.22648356137063\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"64","issue":"1-3","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"50e4a323e4b0e8fec6cdb777","contributors":{"authors":[{"text":"Manheim, F.T. 0000-0003-4005-4524","orcid":"https://orcid.org/0000-0003-4005-4524","contributorId":55421,"corporation":false,"usgs":true,"family":"Manheim","given":"F.T.","affiliations":[],"preferred":false,"id":392113,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Buchholtz ten Brink, Marilyn R.","contributorId":88021,"corporation":false,"usgs":true,"family":"Buchholtz ten Brink","given":"Marilyn","email":"","middleInitial":"R.","affiliations":[{"id":678,"text":"Woods Hole Coastal and Marine Science Center","active":true,"usgs":true}],"preferred":false,"id":392112,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Mecray, E.L.","contributorId":14840,"corporation":false,"usgs":true,"family":"Mecray","given":"E.L.","email":"","affiliations":[],"preferred":false,"id":392111,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":7000006,"text":"7000006 - 1998 - Earthquakes","interactions":[],"lastModifiedDate":"2015-05-11T11:14:03","indexId":"7000006","displayToPublicDate":"1999-01-01T00:00:00","publicationYear":"1998","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":6,"text":"USGS Unnumbered Series"},"seriesTitle":{"id":363,"text":"General Interest Publication","active":false,"publicationSubtype":{"id":6}},"title":"Earthquakes","docAbstract":"One of the most frightening and destructive phenomena of nature is a severe earthquake and its terrible aftereffects. 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Sites of greatest hazard are being identified, and definite progress is being made in designing structures that will withstand the effects of earthquakes.
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Report","code":"OFR","onlineIssn":"2331-1258","printIssn":"0196-1497","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"98-205","title":"Lithostratigraphy, petrography, biostratigraphy, and strontium-isotope stratigraphy of the surficial aquifer system of western Collier County, Florida","docAbstract":"In 1996, seven cores were recovered in western Collier County, southwestern Florida, to acquire subsurface geologic and hydrologic data to support ground-water modeling efforts. This report presents the lithostratigraphy, X-ray diffraction analyses, petrography, biostratigraphy, and strontium-isotope stratigraphy of these cores. \r\n\r\nThe oldest unit encountered in the study cores is an unnamed formation that is late Miocene. At least four depositional sequences are present within this formation. Calculated age of the formation, based on strontium-isotope stratigraphy, ranges from 9.5 to 5.7 Ma (million years ago). An unconformity within this formation that represents a hiatus of at least 2 million years is indicated in the Old Pump Road core. In two cores, Collier-Seminole and Old Pump Road, the uppermost sediments of the unnamed formation are not dated by strontium isotopes, and, based on the fossils present, these sediments could be as young as Pliocene. In another core (Fakahatchee Strand-Ranger Station), the upper part of the unnamed formation is dated by mollusks as Pliocene. The Tamiami Formation overlies the unnamed formation throughout the study area and is represented by the Ochopee Limestone Member. The unit is Pliocene and probably includes the interval of time near the early/late Pliocene boundary. Strontium-isotope analysis indicates an early Pliocene age (calculated ages range from 5.1 to 3.5 Ma), but the margin of error includes the latest Miocene and the late Pliocene. The dinocyst assemblages in the Ochopee typically are not age-diagnostic, but, near the base of the unit in the Collier-Seminole, Jones Grade, and Fakahatchee Strand State Forest cores, they indicate an age of late Miocene or Pliocene. The molluscan assemblages indicate a Pliocene age for the Ochopee, and a distinctive assemblage of Carditimera arata and Chione cortinaria in several of the cores specifically indicates an age near the early/late Pliocene boundary. \r\n\r\nUndifferentiated sands overlie the Pliocene limestones in two cores in the southern part of the study area. Artificial fill occurs at the top of most of the cores. \r\n\r\nThe hydrologic confining units penetrated by these cores are different in different parts of the study area. To the west, a hard tightly cemented dolostone forms the first major confining unit below the water table. In the eastern part of the study area, confinement is more difficult to determine. A tightly cemented sandstone, much younger than the dolostones to the west and probably not laterally connected to them, forms a slight confining unit in one core. Thick zones of poorly sorted muddy unconsolidated sands form a slight confining unit in other cores; these probably are not correlative to either the sandstone or the dolostones to the west. The age and sedimentologic observations suggest a complex compartmentalization of the surficial aquifer system in southwestern Florida. The calibrations of dinocyst and molluscan occurrences with strontium-isotope stratigraphy allows us to expand and document the reported ranges of many taxa. \r\n\r\n\r\nThis report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards or with the North American Stratigraphic Code. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.","language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/ofr98205","issn":"0094-9140","usgsCitation":"Edwards, L.E., Weedman, S., Simmons, K., Scott, T., Brewster-Wingard, G., Ishman, S., and Carlin, N., 1998, Lithostratigraphy, petrography, biostratigraphy, and strontium-isotope stratigraphy of the surficial aquifer system of western Collier County, Florida: U.S. Geological Survey Open-File Report 98-205, 79 p., https://doi.org/10.3133/ofr98205.","productDescription":"79 p.","costCenters":[{"id":27821,"text":"Caribbean-Florida Water Science Center","active":true,"usgs":true}],"links":[{"id":155274,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/of/1998/0205/report-thumb.jpg"},{"id":51399,"rank":299,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/of/1998/0205/ofr98205.pdf","text":"Report","size":"893 KB","linkFileType":{"id":1,"text":"pdf"},"description":"OFR 98-205"}],"country":"United States","state":"Florida","county":"Collier County","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -81.88110351562499,\n 25.06072125231416\n ],\n [\n -80.62042236328125,\n 25.06072125231416\n ],\n [\n -80.62042236328125,\n 26.27371402440643\n ],\n [\n -81.88110351562499,\n 26.27371402440643\n ],\n [\n -81.88110351562499,\n 25.06072125231416\n ]\n ]\n ]\n }\n }\n ]\n}","contact":"Caribbean-Florida Water Science Center
U.S. Geological Survey
3321 College Avenue
Davie, FL 33314
This report presents data for samples of periphyton and water collected in 1995 and 1996 from Water Conservation Areas, the Big Cypress National Preserve, and the Everglades National Park in south Florida. Periphyton samples were analyzed for concentrations of total mercury, methylmercury, nitrogen, phosphorus, organic carbon, and inorganic carbon . Water-column samples collected on the same dates as the periphyton samples were analyzed for concentrations of major ions.
","language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Reston, VA","doi":"10.3133/ofr9876","issn":"0094-9140","usgsCitation":"Simon, N., Cox, T., and Spencer, R., 1998, Data for periphyton and water samples collected from the south Florida ecosystem, 1995 and 1996: U.S. Geological Survey Open-File Report 98-76, iv, 33 p., https://doi.org/10.3133/ofr9876.","productDescription":"iv, 33 p.","costCenters":[{"id":27821,"text":"Caribbean-Florida Water Science Center","active":true,"usgs":true}],"links":[{"id":1623,"rank":100,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/of/1998/0076/ofr199876.pdf","text":"Report","size":"1.86 MB","linkFileType":{"id":1,"text":"pdf"},"description":"OFR 1998-76"},{"id":155546,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/of/1998/0076/coverthb.jpg"}],"country":"United States","state":"Florida","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -82.77099609375,\n 25.085598897064752\n ],\n [\n -79.453125,\n 25.085598897064752\n ],\n [\n -79.453125,\n 27.702983735525862\n ],\n [\n -82.77099609375,\n 27.702983735525862\n ],\n [\n -82.77099609375,\n 25.085598897064752\n ]\n ]\n ]\n }\n }\n ]\n}","contact":"Caribbean-Florida Water Science Center
U.S. Geological Survey
3321 College Avenue
Davie, FL 33314
No abstract available.
","language":"English","publisher":"Adams Business Media","usgsCitation":"Bourgeois, P.E., Sclafani, V.J., Summers, J., Robb, S.C., and Vairin, B.A., 1998, Think before you sample data!: GeoWorld, v. 11, no. 12, p. 51-53.","productDescription":"3 p.","startPage":"51","endPage":"53","costCenters":[{"id":455,"text":"National Wetlands Research Center","active":true,"usgs":true},{"id":17705,"text":"Wetland and Aquatic Research Center","active":true,"usgs":true}],"links":[{"id":371128,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United 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C.","contributorId":221634,"corporation":false,"usgs":false,"family":"Robb","given":"S.","email":"","middleInitial":"C.","affiliations":[],"preferred":false,"id":779267,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Vairin, Beth A. vairinb@usgs.gov","contributorId":211,"corporation":false,"usgs":true,"family":"Vairin","given":"Beth","email":"vairinb@usgs.gov","middleInitial":"A.","affiliations":[],"preferred":true,"id":779268,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}} ,{"id":70204282,"text":"70204282 - 1998 - Suggestions for new and aspiring graduate students in wildlife science","interactions":[],"lastModifiedDate":"2019-07-16T15:46:02","indexId":"70204282","displayToPublicDate":"1998-12-31T15:39:51","publicationYear":"1998","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3779,"text":"Wildlife Society Bulletin","onlineIssn":"1938-5463","printIssn":"0091-7648","active":true,"publicationSubtype":{"id":10}},"title":"Suggestions for new and aspiring graduate students in wildlife science","docAbstract":" The transition from an undergraduate to a graduate program can be a difficult experience for students. Many undergraduates are unfamiliar with the process of preparing for graduate school, especially the search for a graduate program. Once in graduate school, they may be unfamiliar with requirements (both written and unwritten) and expectations, and they may also lack the necessary knowledge or skills to complete a graduate program successfully. For students in wildlife science graduate programs, these problems can become major issues, especially for students with undergraduate degrees in fields other than wildlife science (e.g., biology programs). Although several authors have provided advice to graduate students (Stearns 1987, Hucy 1987, Witz 1994), their suggestions either did not provide sufficient information for undergraduate students, or
did not apply to graduate students in wildlife science. We provide information for undergraduates and new graduate students in wildlife science that is often unavailable prior to and during the initial phases of a graduate program. Our objectives are: (1) to provide advice on how to prepare for graduate school; (2) to provide an approach to locating,
evaluating, and selecting potential graduate schools and a graduate advisor; (3) to describe the fundamentals of graduate school; and (4) to familiarize students with available tools and techniques to enhance a graduate program. We hope that university professors will provide this paper to undergraduates to aid those interested in attending graduate
school. In addition, graduate advisors may wish to provide this paper to new graduate students as they begin their programs.
No abstract available
","language":"English","publisher":"Southern Appalachian Botanical Club","usgsCitation":"Johnson, S.R., and Allain, L.K., 1998, Observations on insect use of Chinese Tallow [Sapium sebiferum (L.) 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Research Center","active":true,"usgs":true},{"id":455,"text":"National Wetlands Research Center","active":true,"usgs":true}],"preferred":true,"id":768031,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70206475,"text":"70206475 - 1998 - Effects of vertebrate herbivores on soil processes, plant biomass, litter accumulation and soil elevation changes in a coastal marsh","interactions":[],"lastModifiedDate":"2019-11-06T12:07:03","indexId":"70206475","displayToPublicDate":"1998-12-31T11:57:16","publicationYear":"1998","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2242,"text":"Journal of Ecology","active":true,"publicationSubtype":{"id":10}},"title":"Effects of vertebrate herbivores on soil processes, plant biomass, litter accumulation and soil elevation changes in a coastal marsh","docAbstract":"1 Submergence of coastal wetlands in Louisiana is currently rapid and widespread. A number of factors contribute to this loss of habitat, including the activities of herbivores. The objective of this study was to examine the effects of large mammals, predominantly nutria and wild boar, on processes controlling soil elevation in coastal marshes.
2 Effects of herbivores on soil and vegetation were assessed by the use of paired fenced and unfenced plots over two successive growing seasons. Above‐ground biomass, litter production, changes in soil elevation, vertical soil accretion, shallow subsidence, below‐ground production of roots and rhizomes, the thickness of the root zone, soil bulk density, and soil organic matter were measured.
3 Above‐ground biomass, below‐ground production, soil elevation and the expansion of the root zone decreased due to herbivore activity. Litter production, the rate of soil surface accretion and shallow soil subsidence were all higher in grazed compared to ungrazed plots, while soil organic matter and bulk density did not differ significantly between treatments.
4 The results indicate that herbivores can have a negative effect on soil building processes, primarily by reducing below‐ground production and expansion of the root zone. Where natural rates of mineral sediment deposition are high, coastal marshes are expected to persist, despite herbivore activities. However, where sediment inputs are substantially less, herbivores may lead to destruction of habitat.
","language":"English","publisher":"British Ecological Society","doi":"10.1046/j.1365-2745.1998.00314.x","usgsCitation":"Ford, M., and Grace, J.B., 1998, Effects of vertebrate herbivores on soil processes, plant biomass, litter accumulation and soil elevation changes in a coastal marsh: Journal of Ecology, v. 86, no. 6, p. 974-982, https://doi.org/10.1046/j.1365-2745.1998.00314.x.","productDescription":"9 p.","startPage":"974","endPage":"982","costCenters":[{"id":455,"text":"National Wetlands Research Center","active":true,"usgs":true},{"id":17705,"text":"Wetland and Aquatic Research Center","active":true,"usgs":true}],"links":[{"id":479688,"rank":0,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1046/j.1365-2745.1998.00314.x","text":"Publisher Index Page"},{"id":368974,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Louisiana","otherGeospatial":"Pearl River Wildlife Management Area","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -89.73770141601562,\n 30.140376821599734\n ],\n [\n -89.5220947265625,\n 30.140376821599734\n ],\n [\n -89.5220947265625,\n 30.315987718557867\n ],\n [\n -89.73770141601562,\n 30.315987718557867\n ],\n [\n -89.73770141601562,\n 30.140376821599734\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"86","issue":"6","noUsgsAuthors":false,"publicationDate":"2002-01-05","publicationStatus":"PW","contributors":{"authors":[{"text":"Ford, Mark","contributorId":177097,"corporation":false,"usgs":false,"family":"Ford","given":"Mark","email":"","affiliations":[],"preferred":false,"id":774771,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Grace, James B. 0000-0001-6374-4726 gracej@usgs.gov","orcid":"https://orcid.org/0000-0001-6374-4726","contributorId":884,"corporation":false,"usgs":true,"family":"Grace","given":"James","email":"gracej@usgs.gov","middleInitial":"B.","affiliations":[{"id":531,"text":"Patuxent Wildlife Research Center","active":true,"usgs":true},{"id":17705,"text":"Wetland and Aquatic Research Center","active":true,"usgs":true},{"id":455,"text":"National Wetlands Research Center","active":true,"usgs":true}],"preferred":true,"id":774772,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70209804,"text":"70209804 - 1998 - U-Pb age evidence for long-term stability of the unsaturated zone at Yucca Mountain","interactions":[],"lastModifiedDate":"2020-07-15T15:56:39.269056","indexId":"70209804","displayToPublicDate":"1998-12-31T11:38:31","publicationYear":"1998","noYear":false,"publicationType":{"id":24,"text":"Conference Paper"},"publicationSubtype":{"id":19,"text":"Conference Paper"},"title":"U-Pb age evidence for long-term stability of the unsaturated zone at Yucca Mountain","docAbstract":"No abstract available.
","largerWorkType":{"id":4,"text":"Book"},"largerWorkTitle":"High-level radioactive waste management: Proceedings of the eighth international conference","largerWorkSubtype":{"id":12,"text":"Conference publication"},"conferenceTitle":"High-level radioactive waste management: The eighth international conference","conferenceDate":"May 11-14, 1998","conferenceLocation":"Las Vegas, NV","language":"English","publisher":"American Nuclear Society","usgsCitation":"Neymark, L., Amelin, Y.V., Paces, J.B., and Peterman, Z.E., 1998, U-Pb age evidence for long-term stability of the unsaturated zone at Yucca Mountain, in High-level radioactive waste management: Proceedings of the eighth international conference, Las Vegas, NV, May 11-14, 1998, p. 85-87.","productDescription":"3 p.","startPage":"85","endPage":"87","costCenters":[{"id":318,"text":"Geosciences and Environmental Change Science Center","active":true,"usgs":true}],"links":[{"id":374360,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Nevada","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -116.48254394531249,\n 36.91352904330221\n ],\n [\n -116.43602371215822,\n 36.91352904330221\n ],\n [\n -116.43602371215822,\n 36.95757376878687\n ],\n [\n -116.48254394531249,\n 36.95757376878687\n ],\n [\n -116.48254394531249,\n 36.91352904330221\n ]\n ]\n ]\n }\n }\n ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","contributors":{"authors":[{"text":"Neymark, Leonid A. 0000-0003-4190-0278 lneymark@usgs.gov","orcid":"https://orcid.org/0000-0003-4190-0278","contributorId":140338,"corporation":false,"usgs":true,"family":"Neymark","given":"Leonid A.","email":"lneymark@usgs.gov","affiliations":[{"id":318,"text":"Geosciences and Environmental Change Science Center","active":true,"usgs":true},{"id":171,"text":"Central Mineral and Environmental Resources Science Center","active":true,"usgs":true}],"preferred":true,"id":792923,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Amelin, Y. V.","contributorId":89679,"corporation":false,"usgs":true,"family":"Amelin","given":"Y.","email":"","middleInitial":"V.","affiliations":[],"preferred":false,"id":788096,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Paces, James B. 0000-0002-9809-8493 jbpaces@usgs.gov","orcid":"https://orcid.org/0000-0002-9809-8493","contributorId":2514,"corporation":false,"usgs":true,"family":"Paces","given":"James","email":"jbpaces@usgs.gov","middleInitial":"B.","affiliations":[{"id":318,"text":"Geosciences and Environmental Change Science Center","active":true,"usgs":true}],"preferred":true,"id":788097,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Peterman, Zell E. 0000-0002-5694-8082 peterman@usgs.gov","orcid":"https://orcid.org/0000-0002-5694-8082","contributorId":167699,"corporation":false,"usgs":true,"family":"Peterman","given":"Zell","email":"peterman@usgs.gov","middleInitial":"E.","affiliations":[{"id":164,"text":"Central Energy Resources Science Center","active":true,"usgs":true}],"preferred":true,"id":788098,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70221595,"text":"70221595 - 1998 - Geology of the Black Mingo Group (Paleocene) in the Kingstree and St. Stephen areas of South Carolina","interactions":[],"lastModifiedDate":"2021-06-24T16:41:51.567747","indexId":"70221595","displayToPublicDate":"1998-12-31T11:35:48","publicationYear":"1998","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":8940,"text":"Transactions of the American Philosophical Society","active":false,"publicationSubtype":{"id":10}},"title":"Geology of the Black Mingo Group (Paleocene) in the Kingstree and St. Stephen areas of South Carolina","docAbstract":"Paleocene vertebrate remains from the areas of Kingstree and St. Stephen, South Carolina, come from the Rhems and Williamsburg formations of the Black Mingo Group. Sedimentary textures and fossils indicate that both units accumulated in shallow, nearshore marine, lagoonal, and deltaic depositional environments. Calcareous nannofossils and dinoflagellates indicate that the vertebrate-bearing portions of the Williamsburg Formation near St. Stephen belong within calcareous nannoplankton Zones NP 3-5 (Lower Bridge Member) and within calcareous nannoplankton zones NP 8-9 (Chicora Member). Paleocene vertibrate remains from Kingstree probably all come from near the base of the Rhems Formation.
","language":"English","publisher":"American Philosopical Society","doi":"10.2307/1006668","usgsCitation":"Weems, R.E., and Bybell, L.M., 1998, Geology of the Black Mingo Group (Paleocene) in the Kingstree and St. Stephen areas of South Carolina: Transactions of the American Philosophical Society, v. 88, no. 4, p. 9-27, https://doi.org/10.2307/1006668.","productDescription":"19 p.","startPage":"9","endPage":"27","costCenters":[{"id":243,"text":"Eastern Geology and Paleoclimate Science Center","active":true,"usgs":true}],"links":[{"id":386707,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"South Carolina","city":"Kingstree, St. Stephen","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -80.05531311035156,\n 33.43946348316134\n ],\n [\n -79.76417541503906,\n 33.43946348316134\n ],\n [\n -79.76417541503906,\n 33.696922692957685\n ],\n [\n -80.05531311035156,\n 33.696922692957685\n ],\n [\n -80.05531311035156,\n 33.43946348316134\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"88","issue":"4","noUsgsAuthors":false,"publicationStatus":"PW","contributors":{"authors":[{"text":"Weems, Robert E. 0000-0002-1907-7804 rweems@usgs.gov","orcid":"https://orcid.org/0000-0002-1907-7804","contributorId":2663,"corporation":false,"usgs":true,"family":"Weems","given":"Robert","email":"rweems@usgs.gov","middleInitial":"E.","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":818232,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Bybell, Laurel M. 0000-0002-4760-7542 lbybell@usgs.gov","orcid":"https://orcid.org/0000-0002-4760-7542","contributorId":1760,"corporation":false,"usgs":true,"family":"Bybell","given":"Laurel","email":"lbybell@usgs.gov","middleInitial":"M.","affiliations":[{"id":243,"text":"Eastern Geology and Paleoclimate Science Center","active":true,"usgs":true}],"preferred":true,"id":818233,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70209803,"text":"70209803 - 1998 - Secondary minerals record past percolation flux at Yucca Mountain, Nevada","interactions":[],"lastModifiedDate":"2020-04-29T16:35:53.42788","indexId":"70209803","displayToPublicDate":"1998-12-31T11:29:46","publicationYear":"1998","noYear":false,"publicationType":{"id":24,"text":"Conference Paper"},"publicationSubtype":{"id":19,"text":"Conference Paper"},"title":"Secondary minerals record past percolation flux at Yucca Mountain, Nevada","docAbstract":"No abstract available.
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","largerWorkType":{"id":4,"text":"Book"},"largerWorkTitle":"Quaternary geology of the Yucca Mountain area, Southern Nevada: Field trip guide","largerWorkSubtype":{"id":12,"text":"Conference publication"},"conferenceTitle":"1998 Annual Meeting of the Friends of the Pleistocene, Pacific Cell","conferenceDate":"Oct 9-11, 1998","conferenceLocation":"Yucca Mountain, NV","language":"English","publisher":"Friends of the Pleistocene, Pacific Cell","usgsCitation":"Lundstrom, S.C., Paces, J.B., and Mahan, S.A., 1998, Late Quaternary history of Fortymile Wash in the area near the H-road crossing, in Quaternary geology of the Yucca Mountain area, Southern Nevada: Field trip guide, Yucca Mountain, NV, Oct 9-11, 1998, p. 63-76.","productDescription":"14 p.","startPage":"63","endPage":"76","costCenters":[{"id":318,"text":"Geosciences and Environmental Change Science Center","active":true,"usgs":true}],"links":[{"id":374357,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Callifornia, Nevada","otherGeospatial":"Fortymile Wash","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -117.41638183593749,\n 35.45619556834375\n ],\n [\n -115.32897949218749,\n 35.45619556834375\n ],\n [\n -115.32897949218749,\n 37.60987994374712\n ],\n [\n -117.41638183593749,\n 37.60987994374712\n ],\n [\n -117.41638183593749,\n 35.45619556834375\n ]\n ]\n ]\n }\n }\n ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","contributors":{"authors":[{"text":"Lundstrom, Scott C. 0000-0003-4149-2219 sclundst@usgs.gov","orcid":"https://orcid.org/0000-0003-4149-2219","contributorId":2446,"corporation":false,"usgs":true,"family":"Lundstrom","given":"Scott","email":"sclundst@usgs.gov","middleInitial":"C.","affiliations":[{"id":318,"text":"Geosciences and Environmental Change Science Center","active":true,"usgs":true}],"preferred":true,"id":788088,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Paces, James B. 0000-0002-9809-8493 jbpaces@usgs.gov","orcid":"https://orcid.org/0000-0002-9809-8493","contributorId":2514,"corporation":false,"usgs":true,"family":"Paces","given":"James","email":"jbpaces@usgs.gov","middleInitial":"B.","affiliations":[{"id":318,"text":"Geosciences and Environmental Change Science Center","active":true,"usgs":true}],"preferred":true,"id":788089,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Mahan, Shannon A. 0000-0001-5214-7774 smahan@usgs.gov","orcid":"https://orcid.org/0000-0001-5214-7774","contributorId":147159,"corporation":false,"usgs":true,"family":"Mahan","given":"Shannon","email":"smahan@usgs.gov","middleInitial":"A.","affiliations":[{"id":318,"text":"Geosciences and Environmental Change Science Center","active":true,"usgs":true}],"preferred":true,"id":788090,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70206079,"text":"70206079 - 1998 - Evaluation of geologic radon potential in two regions in southwestern and southern Poland","interactions":[],"lastModifiedDate":"2019-10-22T07:07:11","indexId":"70206079","displayToPublicDate":"1998-12-31T10:57:27","publicationYear":"1998","noYear":false,"publicationType":{"id":24,"text":"Conference Paper"},"publicationSubtype":{"id":19,"text":"Conference Paper"},"title":"Evaluation of geologic radon potential in two regions in southwestern and southern Poland","docAbstract":"No abstract available.
","largerWorkType":{"id":4,"text":"Book"},"largerWorkTitle":"International Symposium and Exhibition on Environmental Contamination in Central and Eastern Europe","largerWorkSubtype":{"id":12,"text":"Conference publication"},"conferenceTitle":"International Symposium and Exhibition on Environmental Contamination in Central and Eastern Europe","conferenceDate":"September 15-17, 1998","conferenceLocation":"Warsaw, Poland","language":"English","publisher":"Institute for Ecology of Industrial Areas","usgsCitation":"Strzelecki, R., Wolkowicz, S., Wolkowicz, W., Mamont-Ciesa, K., Mose, D., Szabo, Z., Ivahnenko, T.I., and Mushrush, G., 1998, Evaluation of geologic radon potential in two regions in southwestern and southern Poland, in International Symposium and Exhibition on Environmental Contamination in Central and Eastern Europe, Warsaw, Poland, September 15-17, 1998, 7 p.","productDescription":"7 p.","costCenters":[{"id":470,"text":"New Jersey Water Science Center","active":true,"usgs":true}],"links":[{"id":368449,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"Poland","geographicExtents":"{\"type\":\"FeatureCollection\",\"features\":[{\"type\":\"Feature\",\"geometry\":{\"type\":\"Polygon\",\"coordinates\":[[[15.017,51.10667],[14.6071,51.74519],[14.68503,52.08995],[14.4376,52.62485],[14.07452,52.98126],[14.35332,53.24817],[14.11969,53.75703],[14.8029,54.05071],[16.36348,54.51316],[17.62283,54.85154],[18.62086,54.68261],[18.69625,54.43872],[19.66064,54.42608],[20.89224,54.31252],[22.7311,54.32754],[23.24399,54.22057],[23.48413,53.9125],[23.52754,53.47012],[23.80493,53.08973],[23.7992,52.6911],[23.19949,52.48698],[23.508,52.02365],[23.52707,51.57845],[24.02999,50.70541],[23.92276,50.42488],[23.42651,50.30851],[22.51845,49.47677],[22.77642,49.0274],[22.55814,49.08574],[21.60781,49.47011],[20.88796,49.32877],[20.41584,49.43145],[19.82502,49.21713],[19.32071,49.57157],[18.90957,49.43585],[18.85314,49.49623],[18.39291,49.98863],[17.64945,50.04904],[17.55457,50.36215],[16.86877,50.47397],[16.71948,50.21575],[16.17625,50.42261],[16.23863,50.69773],[15.49097,50.78473],[15.017,51.10667]]]},\"properties\":{\"name\":\"Poland\"}}]}","noUsgsAuthors":false,"publicationStatus":"PW","contributors":{"authors":[{"text":"Strzelecki, Ryszard","contributorId":219881,"corporation":false,"usgs":false,"family":"Strzelecki","given":"Ryszard","email":"","affiliations":[],"preferred":false,"id":773500,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Wolkowicz, Stanislaw","contributorId":219882,"corporation":false,"usgs":false,"family":"Wolkowicz","given":"Stanislaw","email":"","affiliations":[],"preferred":false,"id":773501,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Wolkowicz, Wojciech","contributorId":219883,"corporation":false,"usgs":false,"family":"Wolkowicz","given":"Wojciech","email":"","affiliations":[],"preferred":false,"id":773502,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Mamont-Ciesa, Kalina","contributorId":219884,"corporation":false,"usgs":false,"family":"Mamont-Ciesa","given":"Kalina","email":"","affiliations":[],"preferred":false,"id":773503,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Mose, D.G.","contributorId":33461,"corporation":false,"usgs":true,"family":"Mose","given":"D.G.","affiliations":[],"preferred":false,"id":773504,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Szabo, Zoltan 0000-0002-0760-9607 zszabo@usgs.gov","orcid":"https://orcid.org/0000-0002-0760-9607","contributorId":138827,"corporation":false,"usgs":true,"family":"Szabo","given":"Zoltan","email":"zszabo@usgs.gov","affiliations":[{"id":470,"text":"New Jersey Water Science Center","active":true,"usgs":true}],"preferred":true,"id":773505,"contributorType":{"id":1,"text":"Authors"},"rank":6},{"text":"Ivahnenko, Tamara I. 0000-0002-1124-7688 ivahnenk@usgs.gov","orcid":"https://orcid.org/0000-0002-1124-7688","contributorId":2050,"corporation":false,"usgs":true,"family":"Ivahnenko","given":"Tamara","email":"ivahnenk@usgs.gov","middleInitial":"I.","affiliations":[{"id":191,"text":"Colorado Water Science Center","active":true,"usgs":true},{"id":5078,"text":"Southwest Regional Director's Office","active":true,"usgs":true}],"preferred":false,"id":773506,"contributorType":{"id":1,"text":"Authors"},"rank":7},{"text":"Mushrush, G.W.","contributorId":92811,"corporation":false,"usgs":true,"family":"Mushrush","given":"G.W.","email":"","affiliations":[],"preferred":false,"id":773507,"contributorType":{"id":1,"text":"Authors"},"rank":8}]}} ,{"id":70211139,"text":"70211139 - 1998 - Neogene to Quaternary U-Th-Pb geochronology using opal, Yucca Mountain, Nevada, USA","interactions":[],"lastModifiedDate":"2023-11-22T17:14:00.50239","indexId":"70211139","displayToPublicDate":"1998-12-31T10:46:07","publicationYear":"1998","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2748,"text":"Mineralogical Magazine","active":true,"publicationSubtype":{"id":10}},"title":"Neogene to Quaternary U-Th-Pb geochronology using opal, Yucca Mountain, Nevada, USA","docAbstract":"No abstract available.
","language":"English","publisher":"Mineralogical Society of Great Britain and Ireland","doi":"10.1180/minmag.1998.62A.2.230","usgsCitation":"Neymark, L., Paces, J.B., and Amelin, Y.V., 1998, Neogene to Quaternary U-Th-Pb geochronology using opal, Yucca Mountain, Nevada, USA: Mineralogical Magazine, v. 62A, no. 2, p. 1077-1078, https://doi.org/10.1180/minmag.1998.62A.2.230.","productDescription":"2 p.","startPage":"1077","endPage":"1078","costCenters":[{"id":318,"text":"Geosciences and Environmental Change Science Center","active":true,"usgs":true},{"id":35995,"text":"Geology, Geophysics, and Geochemistry Science Center","active":true,"usgs":true}],"links":[{"id":422843,"rank":2,"type":{"id":15,"text":"Index Page"},"url":"https://rruff.info/doclib/MinMag/Volume_62A/62A-2-1077.htm","linkFileType":{"id":5,"text":"html"}},{"id":376408,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Nevada","otherGeospatial":"Yucca Mountain","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -116.48254394531249,\n 36.91352904330221\n ],\n [\n -116.43602371215822,\n 36.91352904330221\n ],\n [\n -116.43602371215822,\n 36.95757376878687\n ],\n [\n -116.48254394531249,\n 36.95757376878687\n ],\n [\n -116.48254394531249,\n 36.91352904330221\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"62A","issue":"2","noUsgsAuthors":false,"publicationStatus":"PW","contributors":{"authors":[{"text":"Neymark, Leonid A. 0000-0003-4190-0278 lneymark@usgs.gov","orcid":"https://orcid.org/0000-0003-4190-0278","contributorId":140338,"corporation":false,"usgs":true,"family":"Neymark","given":"Leonid A.","email":"lneymark@usgs.gov","affiliations":[{"id":171,"text":"Central Mineral and Environmental Resources Science Center","active":true,"usgs":true},{"id":318,"text":"Geosciences and Environmental Change Science Center","active":true,"usgs":true}],"preferred":true,"id":792920,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Paces, James B. 0000-0002-9809-8493 jbpaces@usgs.gov","orcid":"https://orcid.org/0000-0002-9809-8493","contributorId":2514,"corporation":false,"usgs":true,"family":"Paces","given":"James","email":"jbpaces@usgs.gov","middleInitial":"B.","affiliations":[{"id":318,"text":"Geosciences and Environmental Change Science Center","active":true,"usgs":true}],"preferred":true,"id":792921,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Amelin, Yu. V.","contributorId":79634,"corporation":false,"usgs":true,"family":"Amelin","given":"Yu.","email":"","middleInitial":"V.","affiliations":[],"preferred":false,"id":792922,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70206376,"text":"70206376 - 1998 - Mapping hydraulically permeable fractures using directional borehole radar and hole-to-hole tomography with a saline tracer","interactions":[],"lastModifiedDate":"2019-10-31T10:42:47","indexId":"70206376","displayToPublicDate":"1998-12-31T10:38:48","publicationYear":"1998","noYear":false,"publicationType":{"id":24,"text":"Conference Paper"},"publicationSubtype":{"id":19,"text":"Conference Paper"},"title":"Mapping hydraulically permeable fractures using directional borehole radar and hole-to-hole tomography with a saline tracer","docAbstract":"Reflection-mode borehole radar and transmission-mode radar tomograms image heterogeneity in the electromagnetic properties of rock. Heterogeneity may be produced by interfaces between different rock types, foliation, and fracturing. In crystalline rock, hydraulic flow is primarily through fracture networks rather than through the rock matrix. Borehole radar methods have been applied to help map flow paths in crystalline rock. Correlation of features identified in borehole radar reflection records and tomograms with hydraulic flow paths is generally uncertain because the records show responses to heterogeneity of all- kinds, not just to hydraulically permeable fractures. Even in lithologically uniform rock, it is often not possible to distinguish fractures of high hydraulic permeabilities from those with low permeabilities.
It is possible to “erase” signatures from lithologic interfaces and rock fabric to identify the signatures of hydraulically permeable fractures by using a saline tracer in fractured crystalline rock because the electrical properties of the rock, except for the fractures that are open to infiltration by the brine solution, remain the same after the injection of the brine and may be removed by examining differences. Saline tracer experiments were carried out in 1995, 1996, and 1997 in the FSE well field at the Mirror Lake fractured-rock hydrology research site in Grafton County, New Hampshire. Comparisons of results from directional radar reflection surveys to well-to-well difference attenuation tomography in the same pairs of wells show generally good correspondence between the location of radar reflections and attenuation anomalies. Our results demonstrate the advantage of using a saline tracer for before-and-after difference mapping of hydraulically permeable fractures in lithologically heterogeneous rock and the utility of the coordinated use of directional borehole radar and hole-to-hole radar tomography.
","largerWorkType":{"id":4,"text":"Book"},"largerWorkTitle":"Proceedings of the symposium on the application of geophysics to engineering and environmental problems","largerWorkSubtype":{"id":12,"text":"Conference publication"},"conferenceTitle":"Symposium on the Application of Geophysics to Engineering and Environmental Problems","conferenceDate":"March 22-26, 1998","conferenceLocation":"Chicago, IL","language":"English","publisher":"Environmental and Engineering Geophysical Society","usgsCitation":"Wright, D.L., and Lane, J., 1998, Mapping hydraulically permeable fractures using directional borehole radar and hole-to-hole tomography with a saline tracer, in Proceedings of the symposium on the application of geophysics to engineering and environmental problems, Chicago, IL, March 22-26, 1998, p. 379-388.","productDescription":"10 p.","startPage":"379","endPage":"388","costCenters":[{"id":493,"text":"Office of Ground Water","active":true,"usgs":true}],"links":[{"id":368811,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":368810,"rank":1,"type":{"id":15,"text":"Index Page"},"url":"https://water.usgs.gov/ogw/bgas/publications/SAGEEP98_040/"}],"country":"United States","state":"New Hampshire","county":"Grafton County","otherGeospatial":"Mirror Lake","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -71.7026138305664,\n 43.9407373431014\n ],\n [\n -71.68905258178711,\n 43.9407373431014\n ],\n [\n -71.68905258178711,\n 43.94629935894505\n ],\n [\n -71.7026138305664,\n 43.94629935894505\n ],\n [\n -71.7026138305664,\n 43.9407373431014\n ]\n ]\n ]\n }\n }\n ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","contributors":{"authors":[{"text":"Wright, David L. dwright@usgs.gov","contributorId":1132,"corporation":false,"usgs":true,"family":"Wright","given":"David","email":"dwright@usgs.gov","middleInitial":"L.","affiliations":[],"preferred":true,"id":774332,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Lane, John W. Jr. 0000-0002-3558-243X","orcid":"https://orcid.org/0000-0002-3558-243X","contributorId":210076,"corporation":false,"usgs":true,"family":"Lane","given":"John W.","suffix":"Jr.","affiliations":[{"id":37277,"text":"WMA - Earth System Processes Division","active":true,"usgs":true},{"id":486,"text":"OGW Branch of Geophysics","active":true,"usgs":true},{"id":34685,"text":"Dakota Water Science Center","active":true,"usgs":true},{"id":493,"text":"Office of Ground Water","active":true,"usgs":true}],"preferred":true,"id":774333,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70206374,"text":"70206374 - 1998 - Use of multi-offset borehole-radar reflection method in fractured crystalline bedrock at Mirror Lake, Grafton County, New Hampshire","interactions":[],"lastModifiedDate":"2019-10-31T10:24:40","indexId":"70206374","displayToPublicDate":"1998-12-31T10:20:30","publicationYear":"1998","noYear":false,"publicationType":{"id":24,"text":"Conference Paper"},"publicationSubtype":{"id":19,"text":"Conference Paper"},"title":"Use of multi-offset borehole-radar reflection method in fractured crystalline bedrock at Mirror Lake, Grafton County, New Hampshire","docAbstract":"Multi-offset, single-hole, borehole-radar reflection surveys were conducted at the U.S. Geological Survey Fractured Rock Research Site at Mirror Lake, in Grafton County, New Hampshire. The study was conducted to evaluate the benefits of applying multi-offset seismic processing techniques to borehole-radar reflection surveys in fractured rock.
The multi-offset reflection surveys were conducted in conjunction with a saline tracer- injection experiment. During injection, a sodium chloride (NaCl) solution was continuously pumped into a hydraulically conductive zone that was isolated by specially constructed, reusable, PVC straddle packers suspended from PVC casing. Eight common-offset borehole reflection profiles were collected within the PVC-sleeved portion of the borehole before and during the tracer injection. The offset between the transmitter and receiver antennas ranged from 6.4 to 9.9 m (meters). The common offset data were filtered, sorted into common distance-point (CDP) gathers, normal move-out (NMO) corrected, and stacked to produce a zero-offset borehole CDP profile.
Comparison of the common-offset and CDP profiles indicates that multi-offset data acquisition and CDP processing; (1) increases the resolution of reflectors near the borehole, (2) decreases the effects of direct wave coupling, antenna ringing, and system noise, and (3) improves the clarity of difference images used to identify the effects of saline tracer on reflections from transmissive fractures.
","largerWorkType":{"id":4,"text":"Book"},"largerWorkTitle":"Proceedings of the symposium on the application of geophysics to engineering and environmental problems","largerWorkSubtype":{"id":12,"text":"Conference publication"},"conferenceTitle":"Symposium on the Application of Geophysics to Engineering and Environmental Problems","conferenceDate":"March 22-26, 1998","conferenceLocation":"Chicago, IL","language":"English","publisher":"Environmental and Engineering Geophysical Society","usgsCitation":"Lane, J., Haeni, F., and Roelof J. Versteeg, 1998, Use of multi-offset borehole-radar reflection method in fractured crystalline bedrock at Mirror Lake, Grafton County, New Hampshire, in Proceedings of the symposium on the application of geophysics to engineering and environmental problems, Chicago, IL, March 22-26, 1998, p. 359-368.","productDescription":"10 p.","startPage":"359","endPage":"368","costCenters":[{"id":493,"text":"Office of Ground Water","active":true,"usgs":true}],"links":[{"id":368807,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":368806,"rank":1,"type":{"id":15,"text":"Index Page"},"url":"https://water.usgs.gov/ogw/bgas/publications/SAGEEP98_038/"}],"country":"United States","state":"New Hampshire","county":"Grafton County","otherGeospatial":"Mirror Lake","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -71.70295715332031,\n 43.9407373431014\n ],\n [\n -71.68905258178711,\n 43.9407373431014\n ],\n [\n -71.68905258178711,\n 43.94963631866725\n ],\n [\n -71.70295715332031,\n 43.94963631866725\n ],\n [\n -71.70295715332031,\n 43.9407373431014\n ]\n ]\n ]\n }\n }\n ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","contributors":{"authors":[{"text":"Lane, John W. Jr. 0000-0002-3558-243X","orcid":"https://orcid.org/0000-0002-3558-243X","contributorId":210076,"corporation":false,"usgs":true,"family":"Lane","given":"John W.","suffix":"Jr.","affiliations":[{"id":34685,"text":"Dakota Water Science Center","active":true,"usgs":true},{"id":493,"text":"Office of Ground Water","active":true,"usgs":true},{"id":37277,"text":"WMA - Earth System Processes Division","active":true,"usgs":true},{"id":486,"text":"OGW Branch of Geophysics","active":true,"usgs":true}],"preferred":true,"id":774324,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Haeni, F.P.","contributorId":87105,"corporation":false,"usgs":true,"family":"Haeni","given":"F.P.","affiliations":[],"preferred":false,"id":774325,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Roelof J. Versteeg","contributorId":199895,"corporation":false,"usgs":false,"family":"Roelof J. Versteeg","affiliations":[],"preferred":false,"id":774326,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70206373,"text":"70206373 - 1998 - Use of time-lapse attenuation-difference radar tomography methods to monitor saline tracer transport in fractured crystalline bedrock","interactions":[],"lastModifiedDate":"2019-10-31T10:18:55","indexId":"70206373","displayToPublicDate":"1998-12-31T10:13:49","publicationYear":"1998","noYear":false,"publicationType":{"id":24,"text":"Conference Paper"},"publicationSubtype":{"id":19,"text":"Conference Paper"},"title":"Use of time-lapse attenuation-difference radar tomography methods to monitor saline tracer transport in fractured crystalline bedrock","docAbstract":"No abstract available.
","largerWorkType":{"id":4,"text":"Book"},"largerWorkTitle":"Proceedings: Seventh international conference on ground-penetrating radar GPR'98","largerWorkSubtype":{"id":12,"text":"Conference publication"},"conferenceTitle":"Seventh International Conference on Ground Penetrating Radar","conferenceDate":"May 27-30, 1998","conferenceLocation":"Lawrence, KS","language":"English","publisher":"Radar Systems and Remote Sensing Laboratory, University of Kansas","usgsCitation":"Lane, J., Haeni, F., and Day-Lewis, F.D., 1998, Use of time-lapse attenuation-difference radar tomography methods to monitor saline tracer transport in fractured crystalline bedrock, in Proceedings: Seventh international conference on ground-penetrating radar GPR'98, Lawrence, KS, May 27-30, 1998, p. 533-538.","productDescription":"6 p.","startPage":"533","endPage":"538","costCenters":[{"id":493,"text":"Office of Ground Water","active":true,"usgs":true}],"links":[{"id":368805,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"noUsgsAuthors":false,"publicationStatus":"PW","contributors":{"authors":[{"text":"Lane, John W. Jr. 0000-0002-3558-243X","orcid":"https://orcid.org/0000-0002-3558-243X","contributorId":210076,"corporation":false,"usgs":true,"family":"Lane","given":"John W.","suffix":"Jr.","affiliations":[{"id":493,"text":"Office of Ground Water","active":true,"usgs":true},{"id":34685,"text":"Dakota Water Science Center","active":true,"usgs":true},{"id":37277,"text":"WMA - Earth System Processes Division","active":true,"usgs":true},{"id":486,"text":"OGW Branch of Geophysics","active":true,"usgs":true}],"preferred":true,"id":774321,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Haeni, F.P.","contributorId":87105,"corporation":false,"usgs":true,"family":"Haeni","given":"F.P.","affiliations":[],"preferred":false,"id":774322,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Day-Lewis, Frederick D. 0000-0003-3526-886X daylewis@usgs.gov","orcid":"https://orcid.org/0000-0003-3526-886X","contributorId":1672,"corporation":false,"usgs":true,"family":"Day-Lewis","given":"Frederick","email":"daylewis@usgs.gov","middleInitial":"D.","affiliations":[{"id":486,"text":"OGW Branch of Geophysics","active":true,"usgs":true},{"id":37277,"text":"WMA - Earth System Processes Division","active":true,"usgs":true},{"id":493,"text":"Office of Ground Water","active":true,"usgs":true}],"preferred":true,"id":774323,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70226899,"text":"70226899 - 1998 - Assessing groundwater vulnerability using logistic regression","interactions":[],"lastModifiedDate":"2021-12-20T14:58:00.356529","indexId":"70226899","displayToPublicDate":"1998-12-31T08:55:44","publicationYear":"1998","noYear":false,"publicationType":{"id":24,"text":"Conference Paper"},"publicationSubtype":{"id":19,"text":"Conference Paper"},"title":"Assessing groundwater vulnerability using logistic regression","docAbstract":"Determining the likelihood that groundwater contains elevated concentrations of contaminants can help water resource managers protect drinking water supplies. For example, this information is useful for selecting new sites for drinking water sources and designing more cost-effective monitoring strategies for existing sources. Groundwater vulnerability has typically been assessed using largely qualitative methods and expressed as relative measures of risk. In this study, a statistical approach was used to quantify the likelihood that a well contains an elevated concentration of nitrate or a detectable concentration of atrazine.
The occurrence of elevated nitrate concentrations or detectable concentrations of atrazine in groundwater was related to both natural and anthropogenic variables using logistic regression. The variables that best explain the occurrence of elevated nitrate concentrations were well depth, surficial geology, and the percentages of urban and agricultural land within a radius of 3.2 kilometers of a well. Well depth and roadside application of atrazine best explained the occurrence of detectable concentrations of atrazine. From these relations, multiple logistic regression models were developed which predict the probability that a well has an elevated nitrate concentration or a detectable concentration of atrazine.
","largerWorkType":{"id":4,"text":"Book"},"largerWorkTitle":"Conference proceedings: Source water assessment and protection 98","largerWorkSubtype":{"id":12,"text":"Conference publication"},"conferenceTitle":"Source Water Assessment and Protection 98","conferenceDate":"Apr 28-30, 1998","conferenceLocation":"Dallas, TX","language":"English","publisher":"National Water Research Institute","usgsCitation":"Tesoriero, A.J., Inkpen, E.L., and Voss, F.D., 1998, Assessing groundwater vulnerability using logistic regression, in Conference proceedings: Source water assessment and protection 98, Dallas, TX, Apr 28-30, 1998, p. 157-165.","productDescription":"9 p.","startPage":"157","endPage":"165","costCenters":[{"id":629,"text":"Water Resources Division","active":false,"usgs":true}],"links":[{"id":393107,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":393106,"rank":1,"type":{"id":15,"text":"Index Page"},"url":"https://water.usgs.gov/nawqa/pubs/swa_conf1998.html"}],"noUsgsAuthors":false,"publicationStatus":"PW","contributors":{"authors":[{"text":"Tesoriero, Anthony J. 0000-0003-4674-7364 tesorier@usgs.gov","orcid":"https://orcid.org/0000-0003-4674-7364","contributorId":2693,"corporation":false,"usgs":true,"family":"Tesoriero","given":"Anthony","email":"tesorier@usgs.gov","middleInitial":"J.","affiliations":[{"id":518,"text":"Oregon Water Science Center","active":true,"usgs":true}],"preferred":true,"id":828717,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Inkpen, E. L.","contributorId":39776,"corporation":false,"usgs":true,"family":"Inkpen","given":"E.","email":"","middleInitial":"L.","affiliations":[],"preferred":false,"id":828718,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Voss, Frank D. fdvoss@usgs.gov","contributorId":1651,"corporation":false,"usgs":true,"family":"Voss","given":"Frank","email":"fdvoss@usgs.gov","middleInitial":"D.","affiliations":[{"id":677,"text":"Wisconsin Water Science Center","active":true,"usgs":true}],"preferred":true,"id":828719,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ]}