Channelization of streams associated with floodplain forested wetlands has occurred extensively throughout the world and specifically in the southeastern United States. Channelization of fluvial systems alters the hydrologic and sedimentation processes that sustain these systems. In western Tennessee, channelization and past land-use practices have caused drastic geomorphic and hydrologic changes, resulting in altered habitat conditions that may affect avian communities. The objective of this study was to determine if there were differences in avian communities utilizing floodplain forests along unchannelized streams compared to channelized streams with valley plugs, areas where sediment has completely filled the channel. During point count surveys, 58 bird species were observed at unchannelized sites and 60 species were observed at valley plug sites. Species associated with baldcypress-tupelo (Taxodium-Nyssa) swamps (e.g. Great Egret (Ardea albus) and Black-crowned Night Heron (Nycticorax nycticorax)) and mature hardwood forests with open midstories (e.g. Eastern Wood-Pewee (Contopus virens), Yellow-throated Vireo (Vireo flavifrons), Cerulean Warbler (Dendroica cerulea) and Scarlet Tanager (Piranga olivacea)) were either only found at unchannelized sites or were more abundant at unchannelized sites. Conversely, species associated with open and early successional habitats (e.g. Tree Swallow (Tachycineta bicolor), Northern Mockingbird (Mimus polyglottos) and Blue Grosbeak (Passerina caerulea)) were either only found at valley plug sites or were more abundant at valley plug sites. Results of habitat modelling suggest that the habitat characteristics of floodplain forests at unchannelized sites are more suitable for Neotropical migrant bird species of conservation concern in the region than at valley plug sites. This study, in combination with previous research, demonstrates the ecological impacts of valley plugs span across abiotic and biotic processes and tropic levels.
","language":"English","publisher":"Wiley","doi":"10.1002/rra.1429","usgsCitation":"Pierce, A.R., and King, S.L., 2011, A comparison of avian communities and habitat characteristics in floodplain forests associated with valley plugs and unchannelized streams: River Research and Applications, v. 27, no. 10, p. 1315-1324, https://doi.org/10.1002/rra.1429.","productDescription":"10 p.","startPage":"1315","endPage":"1324","onlineOnly":"N","additionalOnlineFiles":"N","ipdsId":"IP-009960","costCenters":[{"id":198,"text":"Coop Res Unit Atlanta","active":true,"usgs":true}],"links":[{"id":300788,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"27","issue":"10","publishingServiceCenter":{"id":8,"text":"Raleigh PSC"},"noUsgsAuthors":false,"publicationDate":"2011-11-21","publicationStatus":"PW","scienceBaseUri":"55659931e4b0d9246a9eb60d","contributors":{"authors":[{"text":"Pierce, Aaron R.","contributorId":94421,"corporation":false,"usgs":false,"family":"Pierce","given":"Aaron","email":"","middleInitial":"R.","affiliations":[{"id":33463,"text":"Nicholls State University, Thibodaux, LA","active":true,"usgs":false}],"preferred":false,"id":547613,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"King, Sammy L. 0000-0002-5364-6361 sking@usgs.gov","orcid":"https://orcid.org/0000-0002-5364-6361","contributorId":557,"corporation":false,"usgs":true,"family":"King","given":"Sammy","email":"sking@usgs.gov","middleInitial":"L.","affiliations":[{"id":198,"text":"Coop Res Unit Atlanta","active":true,"usgs":true}],"preferred":true,"id":547526,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70005381,"text":"70005381 - 2011 - Spatial scaling of core and dominant forest cover in the Upper Mississippi and Illinois River floodplains, USA","interactions":[],"lastModifiedDate":"2021-05-18T14:37:50.291537","indexId":"70005381","displayToPublicDate":"2011-12-01T11:11:00","publicationYear":"2011","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2602,"text":"Landscape Ecology","active":true,"publicationSubtype":{"id":10}},"title":"Spatial scaling of core and dominant forest cover in the Upper Mississippi and Illinois River floodplains, USA","docAbstract":"Different organisms respond to spatial structure in different terms and across different spatial scales. As a consequence, efforts to reverse habitat loss and fragmentation through strategic habitat restoration ought to account for the different habitat density and scale requirements of various taxonomic groups. Here, we estimated the local density of floodplain forest surrounding each of ~20 million 10-m forested pixels of the Upper Mississippi and Illinois River floodplains by using moving windows of multiple sizes (1–100 ha). We further identified forest pixels that met two local density thresholds: ‘core’ forest pixels were nested in a 100% (unfragmented) forested window and ‘dominant’ forest pixels were those nested in a >60% forested window. Finally, we fit two scaling functions to declines in the proportion of forest cover meeting these criteria with increasing window length for 107 management-relevant focal areas: a power function (i.e. self-similar, fractal-like scaling) and an exponential decay function (fractal dimension depends on scale). The exponential decay function consistently explained more variation in changes to the proportion of forest meeting both the ‘core’ and ‘dominant’ criteria with increasing window length than did the power function, suggesting that elevation, soil type, hydrology, and human land use constrain these forest types to a limited range of scales. To examine these scales, we transformed the decay constants to measures of the distance at which the probability of forest meeting the ‘core’ and ‘dominant’ criteria was cut in half (S 1/2, m). S 1/2 for core forest was typically between ~55 and ~95 m depending on location along the river, indicating that core forest cover is restricted to extremely fine scales. In contrast, half of all dominant forest cover was lost at scales that were typically between ~525 and 750 m, but S 1/2 was as long as 1,800 m. S 1/2 is a simple measure that (1) condenses information derived from multi-scale analyses, (2) allows for comparisons of the amount of forest habitat available to species with different habitat density and scale requirements, and (3) can be used as an index of the spatial continuity of habitat types that do not scale fractally.
","language":"English","publisher":"Springer","publisherLocation":"Amsterdam, Netherlands","doi":"10.1007/s10980-011-9594-2","usgsCitation":"De Jager, N.R., and Rohweder, J., 2011, Spatial scaling of core and dominant forest cover in the Upper Mississippi and Illinois River floodplains, USA: Landscape Ecology, v. 26, no. 5, p. 697-708, https://doi.org/10.1007/s10980-011-9594-2.","productDescription":"12 p.","startPage":"697","endPage":"708","costCenters":[{"id":606,"text":"Upper Midwest Environmental Sciences Center","active":true,"usgs":true}],"links":[{"id":204405,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Illinois, Iowa, Minnesota, Missouri, Wisconsin","otherGeospatial":"Upper Mississippi and Illinois River floodplains","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -93.955078125,\n 37.89219554724437\n ],\n [\n -87.73681640625,\n 37.89219554724437\n ],\n [\n -87.73681640625,\n 45.413876460821086\n ],\n [\n -93.955078125,\n 45.413876460821086\n ],\n [\n -93.955078125,\n 37.89219554724437\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"26","issue":"5","noUsgsAuthors":false,"publicationDate":"2011-03-20","publicationStatus":"PW","scienceBaseUri":"505b94a7e4b08c986b31abd1","contributors":{"authors":[{"text":"De Jager, Nathan R. 0000-0002-6649-4125","orcid":"https://orcid.org/0000-0002-6649-4125","contributorId":104616,"corporation":false,"usgs":true,"family":"De Jager","given":"Nathan","email":"","middleInitial":"R.","affiliations":[{"id":606,"text":"Upper Midwest Environmental Sciences Center","active":true,"usgs":true}],"preferred":false,"id":352388,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Rohweder, Jason J.","contributorId":25629,"corporation":false,"usgs":true,"family":"Rohweder","given":"Jason J.","affiliations":[],"preferred":false,"id":352387,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70004869,"text":"70004869 - 2011 - Spatial patterns of mercury in macroinvertebrates and fishes from streams of contrasting forested landscapes in the eastern United States","interactions":[],"lastModifiedDate":"2020-01-14T09:56:07","indexId":"70004869","displayToPublicDate":"2011-12-01T10:33:00","publicationYear":"2011","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1479,"text":"Ecotoxicology","active":true,"publicationSubtype":{"id":10}},"title":"Spatial patterns of mercury in macroinvertebrates and fishes from streams of contrasting forested landscapes in the eastern United States","docAbstract":"Controls on mercury bioaccumulation in lotic ecosystems are not well understood. During 2007–2009, we studied mercury and stable isotope spatial patterns of macroinvertebrates and fishes from two medium-sized (<80 km2) forested basins in contrasting settings. Samples were collected seasonally from multiple sites across the Fishing Brook basin (FBNY), in New York's Adirondack Mountains, and the McTier Creek basin (MCSC), in South Carolina's Coastal Plain. Mean methylmercury (MeHg) concentrations within macroinvertebrate feeding groups, and mean total mercury (THg) concentrations within most fish feeding groups were similar between the two regions. However, mean THg concentrations in game fish and forage fish, overall, were much lower in FBNY (1300 and 590 ng/g dw, respectively) than in MCSC (2300 and 780 ng/g dw, respectively), due to lower trophic positions of these groups from FBNY (means 3.3 and 2.7, respectively) than MCSC (means 3.7 and 3.3, respectively). Much larger spatial variation in topography and water chemistry across FBNY contributed to greater spatial variation in biotic Hg and positive correlations with dissolved MeHg and organic carbon in streamwater. Hydrologic transport distance (HTD) was negatively correlated with biotic Hg across FBNY, and was a better predictor than wetland density. The small range of landscape conditions across MCSC resulted in no consistent spatial patterns, and no discernable correspondence with local-scale environmental factors. This study demonstrates the importance of local-scale environmental factors to mercury bioaccumulation in topographically heterogeneous landscapes, and provides evidence that food-chain length can be an important predictor of broad-scale differences in Hg bioaccumulation among streams.","language":"English","publisher":"Springer","doi":"10.1007/s10646-011-0719-9","usgsCitation":"Riva-Murray, K., Chasar, L.C., Bradley, P.M., Burns, D.A., Brigham, M.E., Smith, M.J., and Abrahamsen, T.A., 2011, Spatial patterns of mercury in macroinvertebrates and fishes from streams of contrasting forested landscapes in the eastern United States: Ecotoxicology, v. 20, no. 7, p. 1530-1542, https://doi.org/10.1007/s10646-011-0719-9.","productDescription":"13 p.","startPage":"1530","endPage":"1542","temporalStart":"2007-01-01","temporalEnd":"2009-12-31","costCenters":[{"id":474,"text":"New York Water Science Center","active":true,"usgs":true},{"id":589,"text":"Toxic Substances Hydrology 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0000-0002-1107-9653 marsmith@usgs.gov","orcid":"https://orcid.org/0000-0002-1107-9653","contributorId":4474,"corporation":false,"usgs":true,"family":"Smith","given":"Martyn","email":"marsmith@usgs.gov","middleInitial":"J.","affiliations":[{"id":474,"text":"New York Water Science Center","active":true,"usgs":true}],"preferred":true,"id":351525,"contributorType":{"id":1,"text":"Authors"},"rank":6},{"text":"Abrahamsen, Thomas A.","contributorId":79137,"corporation":false,"usgs":true,"family":"Abrahamsen","given":"Thomas","email":"","middleInitial":"A.","affiliations":[],"preferred":false,"id":351526,"contributorType":{"id":1,"text":"Authors"},"rank":7}]}} ,{"id":70043371,"text":"70043371 - 2011 - Quantifying the hydrological responses to climate change in an intact forested small watershed in southern China","interactions":[],"lastModifiedDate":"2013-07-23T10:37:55","indexId":"70043371","displayToPublicDate":"2011-12-01T10:29:00","publicationYear":"2011","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1837,"text":"Global Change Biology","active":true,"publicationSubtype":{"id":10}},"title":"Quantifying the hydrological responses to climate change in an intact forested small watershed in southern China","docAbstract":"Responses of hydrological processes to climate change are key components in the Intergovernmental Panel for Climate Change (IPCC) assessment. Understanding these responses is critical for developing appropriate mitigation and adaptation strategies for sustainable water resources management and protection of public safety. However, these responses are not well understood and little long-term evidence exists. Herein, we show how climate change, specifically increased air temperature and storm intensity, can affect soil moisture dynamics and hydrological variables based on both long-term observation and model simulations using the Soil and Water Assessment Tool (SWAT) in an intact forested watershed (the Dinghushan Biosphere Reserve) in Southern China. Our results show that, although total annual precipitation changed little from 1950 to 2009, soil moisture decreased significantly. A significant decline was also found in the monthly 7-day low flow from 2000 to 2009. However, the maximum daily streamflow in the wet season and unconfined groundwater tables have significantly increased during the same 10-year period. The significant decreasing trends on soil moisture and low flow variables suggest that the study watershed is moving towards drought-like condition. Our analysis indicates that the intensification of rainfall storms and the increasing number of annual no-rain days were responsible for the increasing chance of both droughts and floods. We conclude that climate change has indeed induced more extreme hydrological events (e.g. droughts and floods) in this watershed and perhaps other areas of Southern China. This study also demonstrated usefulness of our research methodology and its possible applications on quantifying the impacts of climate change on hydrology in any other watersheds where long-term data are available and human disturbance is negligible.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Global Change Biology","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","publisher":"Wiley","doi":"10.1111/j.1365-2486.2011.02499.x","usgsCitation":"Zhou, G., Wei, X., Wu, Y., Liu, S., Huang, Y., Yan, J., Zhang, D., Zhang, Q., Liu, J., Meng, Z., Wang, C., Chu, G., Liu, S., Tang, X., and Liu, X., 2011, Quantifying the hydrological responses to climate change in an intact forested small watershed in southern China: Global Change Biology, v. 17, no. 12, p. 3736-3746, https://doi.org/10.1111/j.1365-2486.2011.02499.x.","productDescription":"11 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aqueous and dietary exposures to nanosized and ionic Ag","interactions":[],"lastModifiedDate":"2020-01-21T10:56:36","indexId":"70004692","displayToPublicDate":"2011-12-01T00:00:00","publicationYear":"2011","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":"Silver bioaccumulation dynamics in a freshwater invertebrate after aqueous and dietary exposures to nanosized and ionic Ag","docAbstract":"We compared silver (Ag) bioavailability and toxicity to a freshwater gastropod after exposure to ionic silver (Ag+) and to Ag nanoparticles (Ag NPs) capped with citrate or with humic acid. Silver form, exposure route, and capping agent influence Ag bioaccumulation dynamics in Lymnaea stagnalis. Snails efficiently accumulated Ag from all forms after either aqueous or dietary exposure. For both exposure routes, uptake rates were faster for Ag+ than for Ag NPs. Snails efficiently assimilated Ag from Ag NPs mixed with diatoms (assimilation efficiency (AE) ranged from 49 to 58%) and from diatoms pre-exposed to Ag+ (AE of 73%). In the diet, Ag NPs damaged digestion. Snails ate less and inefficiently processed the ingested food, which adversely impacted their growth. Loss rates of Ag were faster after waterborne exposure to Ag NPs than after exposure to dissolved Ag+. Once Ag was taken up from diet, whether from Ag+ or Ag NPs, Ag was lost extremely slowly. Large Ag body concentrations are thus expected in L. stagnalis after dietborne exposures, especially to citrate-capped Ag NPs. Ingestion of Ag associated with particulate materials appears as the most important vector of uptake. Nanosilver exposure from food might trigger important environmental risks.","language":"English","publisher":"ACS Publications","doi":"10.1021/es200880c","usgsCitation":"le Croteau, M., Misra, S.K., Luoma, S.N., and Valsami-Jones, E., 2011, Silver bioaccumulation dynamics in a freshwater invertebrate after aqueous and dietary exposures to nanosized and ionic Ag: Environmental Science & Technology, v. 45, no. 15, p. 6600-6607, https://doi.org/10.1021/es200880c.","productDescription":"8 p.","startPage":"6600","endPage":"6607","costCenters":[{"id":148,"text":"Branch of Regional Research-Western Region","active":false,"usgs":true},{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":204323,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"45","issue":"15","noUsgsAuthors":false,"publicationDate":"2011-07-06","publicationStatus":"PW","scienceBaseUri":"505b8f4ae4b08c986b318e43","contributors":{"authors":[{"text":"le Croteau, Marie-Noe","contributorId":100994,"corporation":false,"usgs":true,"family":"le Croteau","given":"Marie-Noe","email":"","affiliations":[],"preferred":false,"id":351160,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Misra, Superb K.","contributorId":91231,"corporation":false,"usgs":true,"family":"Misra","given":"Superb","email":"","middleInitial":"K.","affiliations":[],"preferred":false,"id":351159,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"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":351157,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Valsami-Jones, Eugenia","contributorId":26057,"corporation":false,"usgs":true,"family":"Valsami-Jones","given":"Eugenia","email":"","affiliations":[],"preferred":false,"id":351158,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70193241,"text":"70193241 - 2011 - Vulnerability of high-latitude soil organic carbon in North America to disturbance","interactions":[],"lastModifiedDate":"2017-10-31T16:36:14","indexId":"70193241","displayToPublicDate":"2011-12-01T00:00:00","publicationYear":"2011","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2319,"text":"Journal of Geophysical Research G: Biogeosciences","active":true,"publicationSubtype":{"id":10}},"title":"Vulnerability of high-latitude soil organic carbon in North America to disturbance","docAbstract":"This synthesis addresses the vulnerability of the North American high-latitude soil organic carbon (SOC) pool to climate change. Disturbances caused by climate warming in arctic, subarctic, and boreal environments can result in significant redistribution of C among major reservoirs with potential global impacts. We divide the current northern high-latitude SOC pools into (1) near-surface soils where SOC is affected by seasonal freeze-thaw processes and changes in moisture status, and (2) deeper permafrost and peatland strata down to several tens of meters depth where SOC is usually not affected by short-term changes. We address key factors (permafrost, vegetation, hydrology, paleoenvironmental history) and processes (C input, storage, decomposition, and output) responsible for the formation of the large high-latitude SOC pool in North America and highlight how climate-related disturbances could alter this pool's character and size. Press disturbances of relatively slow but persistent nature such as top-down thawing of permafrost, and changes in hydrology, microbiological communities, pedological processes, and vegetation types, as well as pulse disturbances of relatively rapid and local nature such as wildfires and thermokarst, could substantially impact SOC stocks. Ongoing climate warming in the North American high-latitude region could result in crossing environmental thresholds, thereby accelerating press disturbances and increasingly triggering pulse disturbances and eventually affecting the C source/sink net character of northern high-latitude soils. Finally, we assess postdisturbance feedbacks, models, and predictions for the northern high-latitude SOC pool, and discuss data and research gaps to be addressed by future research.
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Out-of-channel wetland/floodplain environments were primary sources of filtered MeHg (F-MeHg) to the stream habitat in both systems. Shallow, open-water areas in both basins exhibited low F-MeHg concentrations and decreasing F-MeHg mass flux. Downstream increases in out-of-channel wetlands/floodplains and the absence of impoundments result in high MeHg throughout the Edisto. Despite substantial wetlands coverage and elevated F-MeHg concentrations at the headwater margins, numerous impoundments on primary stream channels favor spatial variability and lower F-MeHg concentrations in the Upper Hudson. The results indicated that, even in geographically, climatically, and ecologically diverse streams, production in wetland/floodplain areas, hydrologic transport to the stream aquatic environment, and conservative/nonconservative attenuation processes in open water areas are fundamental controls on dissolved MeHg concentrations and, by extension, MeHg availability for potential biotic uptake.","language":"English","publisher":"ACS Publications","doi":"10.1021/es103923j","usgsCitation":"Bradley, P.M., Burns, D.A., Riva-Murray, K., Brigham, M.E., Button, D.T., Chasar, L.C., Marvin-DiPasquale, M., Lowery, M.A., and Journey, C.A., 2011, Spatial and seasonal variability of dissolved methylmercury in two stream basins in the Eastern United States: Environmental Science & Technology, v. 45, no. 6, p. 2048-2055, https://doi.org/10.1021/es103923j.","productDescription":"8 p.","startPage":"2048","endPage":"2055","numberOfPages":"8","costCenters":[{"id":559,"text":"South Carolina Water Science 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post-wildfire debris flows, we instrumented and surveyed steep, small watersheds along the tectonically active front of the San Gabriel Mountains, California. Fortuitously, we recorded runoff-generated debris-flows triggered by one spatially restricted convective event with 28 mm of rainfall falling over 62 minutes. Our rain gages, nested hillslope overland-flow sensors and soil-moisture probes, as well as a time series of terrestrial laser scanning (TLS) revealed the effects of the storm. Hillslope overland-flow response, along two ~10-m long flow lines perpendicular to and originating from a drainage divide, displayed only a 10 to 20 minute delay from the onset of rainfall with accumulated totals of merely 5-10 mm. Depth-stratified soil-moisture probes displayed a greater time delay, roughly 20- 30 minutes, indicating that initial overland flow was Hortonian. Furthermore, a downstream channel-monitoring array recorded a pronounced discharge peak generated by the passage of a debris flow after 18 minutes of rainfall. At this time, only four of the eleven hillslope overland flow sensors confirmed the presence of surface-water flow. Repeat TLS and detailed field mapping using GPS document how patterns of rainsplash, overland-flow scour, and rilling contributed to the generation of metter-scale debris flows. In response to a single small storm, the debris flows deposited irregular levees and lobate terminal snouts on hillslopes and caused wide- spread erosion of the valley axis with ground surface lowering exceeding 1.5 m.
","conferenceTitle":"5th International Conference on Debris-Flow Hazards Mitigation: Mechanics, Prediction and Assessment","conferenceDate":"June 14-17, 2011","conferenceLocation":"Padua, Italy","language":"English","publisher":"Sapienza Università di Roma","doi":"10.4408/IJEGE.2011-03.B-064","usgsCitation":"Schmidt, K., Hanshaw, M.N., Howle, J., Kean, J., Staley, D.M., Stock, J., and Bawdeng, W., 2011, Hydrologic conditions and terrestrial laser scanning of post-firedebris flows in the San Gabriel Mountains, CA, U.S.A: Italian Journal of Engineering Geology and Environment, p. 583-593, https://doi.org/10.4408/IJEGE.2011-03.B-064.","productDescription":"11 p.","startPage":"583","endPage":"593","costCenters":[{"id":300,"text":"Geologic Hazards Science Center","active":true,"usgs":true},{"id":312,"text":"Geology, Minerals, Energy, and Geophysics Science Center","active":true,"usgs":true}],"links":[{"id":405686,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"California","otherGeospatial":"San Gabriel Mountains","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -118.3172607421875,\n 34.116352469972746\n ],\n [\n -117.44384765625,\n 34.116352469972746\n ],\n [\n -117.44384765625,\n 34.53371242139564\n ],\n [\n -118.3172607421875,\n 34.53371242139564\n ],\n [\n -118.3172607421875,\n 34.116352469972746\n ]\n ]\n ]\n }\n }\n ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","contributors":{"authors":[{"text":"Schmidt, K. M. 0000-0003-2365-8035","orcid":"https://orcid.org/0000-0003-2365-8035","contributorId":59830,"corporation":false,"usgs":true,"family":"Schmidt","given":"K. M.","affiliations":[{"id":312,"text":"Geology, Minerals, Energy, and Geophysics Science Center","active":true,"usgs":true}],"preferred":false,"id":849861,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Hanshaw, M. N. 0000-0001-9305-307X","orcid":"https://orcid.org/0000-0001-9305-307X","contributorId":56462,"corporation":false,"usgs":true,"family":"Hanshaw","given":"M.","email":"","middleInitial":"N.","affiliations":[],"preferred":false,"id":849862,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Howle, J. F. 0000-0003-0491-6203","orcid":"https://orcid.org/0000-0003-0491-6203","contributorId":66294,"corporation":false,"usgs":true,"family":"Howle","given":"J. F.","affiliations":[],"preferred":false,"id":849863,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Kean, J. W. 0000-0003-3089-0369","orcid":"https://orcid.org/0000-0003-3089-0369","contributorId":71679,"corporation":false,"usgs":true,"family":"Kean","given":"J. W.","affiliations":[],"preferred":false,"id":849864,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Staley, Dennis M. 0000-0002-2239-3402 dstaley@usgs.gov","orcid":"https://orcid.org/0000-0002-2239-3402","contributorId":4134,"corporation":false,"usgs":true,"family":"Staley","given":"Dennis","email":"dstaley@usgs.gov","middleInitial":"M.","affiliations":[{"id":300,"text":"Geologic Hazards Science Center","active":true,"usgs":true}],"preferred":true,"id":849865,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Stock, J. D. 0000-0001-8565-3577","orcid":"https://orcid.org/0000-0001-8565-3577","contributorId":79998,"corporation":false,"usgs":true,"family":"Stock","given":"J. D.","affiliations":[],"preferred":false,"id":849866,"contributorType":{"id":1,"text":"Authors"},"rank":6},{"text":"Bawdeng, W.","contributorId":295737,"corporation":false,"usgs":true,"family":"Bawdeng","given":"W.","email":"","affiliations":[],"preferred":false,"id":849867,"contributorType":{"id":1,"text":"Authors"},"rank":7}]}} ,{"id":70006120,"text":"sir20115183 - 2011 - Selected approaches to estimate water-budget components of the High Plains, 1940 through 1949 and 2000 through 2009","interactions":[],"lastModifiedDate":"2012-03-08T17:16:42","indexId":"sir20115183","displayToPublicDate":"2011-11-30T00:00:00","publicationYear":"2011","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":334,"text":"Scientific Investigations Report","code":"SIR","onlineIssn":"2328-0328","printIssn":"2328-031X","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"2011-5183","title":"Selected approaches to estimate water-budget components of the High Plains, 1940 through 1949 and 2000 through 2009","docAbstract":"The High Plains aquifer, underlying almost 112 million acres in the central United States, is one of the largest aquifers in the Nation. It is the primary water supply for drinking water, irrigation, animal production, and industry in the region. Expansion of irrigated agriculture throughout the past 60 years has helped make the High Plains one of the most productive agricultural regions in the Nation. Extensive withdrawals of groundwater for irrigation have caused water-level declines in many parts of the aquifer and increased concerns about the long-term sustainability of the aquifer. Quantification of water-budget components is a prerequisite for effective water-resources management. Components analyzed as part of this study were precipitation, evapotranspiration, recharge, surface runoff, groundwater discharge to streams, groundwater fluxes to and from adjacent geologic units, irrigation, and groundwater in storage. These components were assessed for 1940 through 1949 (representing conditions prior to substantial groundwater development and referred to as \"pregroundwater development\" throughout this report) and 2000 through 2009. Because no single method can perfectly quantify the magnitude of any part of a water budget at a regional scale, results from several methods and previously published work were compiled and compared for this study when feasible. Results varied among the several methods applied, as indicated by the range of average annual volumes given for each component listed in the following paragraphs. Precipitation was derived from three sources: the Parameter-Elevation Regressions on Independent Slopes Model, data developed using Next Generation Weather Radar and measured precipitation from weather stations by the Office of Hydrologic Development at the National Weather Service for the Sacramento-Soil Moisture Accounting model, and precipitation measured at weather stations and spatially distributed using an inverse-distance-weighted interpolation method. Precipitation estimates using these sources, as a 10-year average annual total volume for the High Plains, ranged from 192 to 199 million acre-feet (acre-ft) for 1940 through 1949 and from 185 to 199 million acre-ft for 2000 through 2009. Evapotranspiration was obtained from three sources: the National Weather Service Sacramento-Soil Moisture Accounting model, the Simplified-Surface-Energy-Balance model using remotely sensed data, and the Soil-Water-Balance model. Average annual total evapotranspiration estimated using these sources was 148 million acre-ft for 1940 through 1949 and ranged from 154 to 193 million acre-ft for 2000 through 2009. The maximum amount of shallow groundwater lost to evapotranspiration was approximated for areas where the water table was within 5 feet of land surface. The average annual total volume of evapotranspiration from shallow groundwater was 9.0 million acre-ft for 1940 through 1949 and ranged from 9.6 to 12.6 million acre-ft for 2000 through 2009. Recharge was estimated using two soil-water-balance models as well as previously published studies for various locations across the High Plains region. Average annual total recharge ranged from 8.3 to 13.2 million acre-ft for 1940 through 1949 and from 15.9 to 35.0 million acre-ft for 2000 through 2009. Surface runoff and groundwater discharge to streams were determined using discharge records from streamflow-gaging stations near the edges of the High Plains and the Base-Flow Index program. For 1940 through 1949, the average annual net surface runoff leaving the High Plains was 1.9 million acre-ft, and the net loss from the High Plains aquifer by groundwater discharge to streams was 3.1 million acre-ft. For 2000 through 2009, the average annual net surface runoff leaving the High Plains region was 1.3 million acre-ft and the net loss by groundwater discharge to streams was 3.9 million acre-ft. For 2000 through 2009, the average annual total estimated groundwater pumpage volume from two soil-water-balance models ranged from 8.7 to 16.2 million acre-ft. Average annual irrigation application rates for the High Plains ranged from 8.4 to 16.2 inches per year. The USGS Water-Use Program published estimated total annual pumpage from the High Plains aquifer for 2000 and 2005. Those volumes were greater than those estimated from the two soil-water-balance models. Total groundwater in storage in the High Plains aquifer was estimated as 3,173 million acre-ft prior to groundwater development and 2,907 million acre-ft in 2007. The average annual decrease of groundwater in storage between 2000 and 2007 was 10 million acre-ft per year.","language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Reston, VA","doi":"10.3133/sir20115183","usgsCitation":"Stanton, J.S., Qi, S.L., Ryter, D.W., Falk, S.E., Houston, N.A., Peterson, S.M., Westenbroek, S.M., and Christenson, S.C., 2011, Selected approaches to estimate water-budget components of the High Plains, 1940 through 1949 and 2000 through 2009: U.S. Geological Survey Scientific Investigations Report 2011-5183, viii, 68 p.; Appendices, https://doi.org/10.3133/sir20115183.","productDescription":"viii, 68 p.; Appendices","onlineOnly":"Y","temporalStart":"1940-01-01","temporalEnd":"2009-12-31","costCenters":[{"id":464,"text":"Nebraska Water Science 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jstanton@usgs.gov","orcid":"https://orcid.org/0000-0002-2520-753X","contributorId":830,"corporation":false,"usgs":true,"family":"Stanton","given":"Jennifer","email":"jstanton@usgs.gov","middleInitial":"S.","affiliations":[{"id":376,"text":"Massachusetts Water Science Center","active":true,"usgs":true},{"id":466,"text":"New England Water Science Center","active":true,"usgs":true},{"id":464,"text":"Nebraska Water Science Center","active":true,"usgs":true}],"preferred":true,"id":353875,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Qi, Sharon L. 0000-0001-7278-4498 slqi@usgs.gov","orcid":"https://orcid.org/0000-0001-7278-4498","contributorId":1130,"corporation":false,"usgs":true,"family":"Qi","given":"Sharon","email":"slqi@usgs.gov","middleInitial":"L.","affiliations":[{"id":622,"text":"Washington Water Science Center","active":true,"usgs":true},{"id":191,"text":"Colorado Water Science Center","active":true,"usgs":true},{"id":518,"text":"Oregon Water Science Center","active":true,"usgs":true}],"preferred":true,"id":353879,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Ryter, Derek W. 0000-0002-2488-626X dryter@usgs.gov","orcid":"https://orcid.org/0000-0002-2488-626X","contributorId":3395,"corporation":false,"usgs":true,"family":"Ryter","given":"Derek","email":"dryter@usgs.gov","middleInitial":"W.","affiliations":[{"id":516,"text":"Oklahoma Water Science Center","active":true,"usgs":true},{"id":154,"text":"California Water Science Center","active":true,"usgs":true}],"preferred":true,"id":353882,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Falk, Sarah E. sefalk@usgs.gov","contributorId":1056,"corporation":false,"usgs":true,"family":"Falk","given":"Sarah","email":"sefalk@usgs.gov","middleInitial":"E.","affiliations":[],"preferred":true,"id":353878,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Houston, Natalie A. 0000-0002-6071-4545 nhouston@usgs.gov","orcid":"https://orcid.org/0000-0002-6071-4545","contributorId":1682,"corporation":false,"usgs":true,"family":"Houston","given":"Natalie","email":"nhouston@usgs.gov","middleInitial":"A.","affiliations":[{"id":583,"text":"Texas Water Science Center","active":true,"usgs":true}],"preferred":true,"id":353880,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Peterson, Steven M. 0000-0002-9130-1284 speterson@usgs.gov","orcid":"https://orcid.org/0000-0002-9130-1284","contributorId":847,"corporation":false,"usgs":true,"family":"Peterson","given":"Steven","email":"speterson@usgs.gov","middleInitial":"M.","affiliations":[{"id":464,"text":"Nebraska Water Science Center","active":true,"usgs":true}],"preferred":true,"id":353876,"contributorType":{"id":1,"text":"Authors"},"rank":6},{"text":"Westenbroek, Stephen M. 0000-0002-6284-8643 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groundwater","interactions":[],"lastModifiedDate":"2020-01-28T08:20:19","indexId":"70006070","displayToPublicDate":"2011-11-30T00:00:00","publicationYear":"2011","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1864,"text":"Ground Water Monitoring and Remediation","active":true,"publicationSubtype":{"id":10}},"title":"Reinterpreting the importance of oxygen-based biodegradation in chloroethene-contaminated groundwater","docAbstract":"Chlororespiration is common in shallow aquifer systems under conditions nominally identified as anoxic. Consequently, chlororespiration is a key component of remediation at many chloroethene-contaminated sites. In some instances, limited accumulation of reductive dechlorination daughter products is interpreted as evidence that natural attenuation is not adequate for site remediation. This conclusion is justified when evidence for parent compound (tetrachloroethene, PCE, or trichloroethene, TCE) degradation is lacking. For many chloroethene-contaminated shallow aquifer systems, however, nonconservative losses of the parent compounds are clear but the mass balance between parent compound attenuation and accumulation of reductive dechlorination daughter products is incomplete. Incomplete mass balance indicates a failure to account for important contaminant attenuation mechanisms and is consistent with contaminant degradation to nondiagnostic mineralization products like CO2. While anoxic mineralization of chloroethene compounds has been proposed previously, recent results suggest that oxygen-based mineralization of chloroethenes also can be significant at dissolved oxygen concentrations below the currently accepted field standard for nominally anoxic conditions. Thus, reassessment of the role and potential importance of low concentrations of oxygen in chloroethene biodegradation are needed, because mischaracterization of operant biodegradation processes can lead to expensive and ineffective remedial actions. A modified interpretive framework is provided for assessing the potential for chloroethene biodegradation under different redox conditions and the probable role of oxygen in chloroethene biodegradation.","language":"English","publisher":"National Ground Water Association","doi":"10.1111/j.1745-6592.2011.01344.x","usgsCitation":"Bradley, P.M., 2011, Reinterpreting the importance of oxygen-based biodegradation in chloroethene-contaminated groundwater: Ground Water Monitoring and Remediation, v. 31, no. 4, p. 50-55, https://doi.org/10.1111/j.1745-6592.2011.01344.x.","productDescription":"6 p.","startPage":"50","endPage":"55","numberOfPages":"6","costCenters":[{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true},{"id":13634,"text":"South Atlantic Water Science Center","active":true,"usgs":true}],"links":[{"id":204423,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"31","issue":"4","noUsgsAuthors":false,"publicationDate":"2011-05-12","publicationStatus":"PW","scienceBaseUri":"4f4e4a60e4b07f02db634dc2","contributors":{"authors":[{"text":"Bradley, Paul M. 0000-0001-7522-8606 pbradley@usgs.gov","orcid":"https://orcid.org/0000-0001-7522-8606","contributorId":361,"corporation":false,"usgs":true,"family":"Bradley","given":"Paul","email":"pbradley@usgs.gov","middleInitial":"M.","affiliations":[{"id":13634,"text":"South Atlantic Water Science Center","active":true,"usgs":true}],"preferred":true,"id":353761,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70006071,"text":"70006071 - 2011 - Microbial mineralization of dichloroethene and vinyl chloride under hypoxic conditions","interactions":[],"lastModifiedDate":"2020-01-28T08:35:43","indexId":"70006071","displayToPublicDate":"2011-11-30T00:00:00","publicationYear":"2011","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1864,"text":"Ground Water Monitoring and Remediation","active":true,"publicationSubtype":{"id":10}},"title":"Microbial mineralization of dichloroethene and vinyl chloride under hypoxic conditions","docAbstract":"Mineralization of 14C-radiolabled vinyl chloride ([1,2-14C] VC) and cis-dichloroethene ([1,2-14C] cis-DCE) under hypoxic (initial dissolved oxygen (DO) concentrations about 0.1 mg/L) and nominally anoxic (DO minimum detection limit = 0.01 mg/L) was examined in chloroethene-exposed sediments from two groundwater and two surface water sites. The results show significant VC and dichloroethene (DCE) mineralization under hypoxic conditions. All the sample treatments exhibited pseudo-first-order kinetics for DCE and VC mineralization over an extended range of substrate concentrations. First-order rates for VC mineralization were approximately 1 to 2 orders of magnitude higher in hypoxic groundwater sediment treatments and at least three times higher in hypoxic surface water sediment treatments than in the respective anoxic treatments. For VC, oxygen-linked processes accounted for 65 to 85% of mineralization at DO concentrations below 0.1 mg/L, and 14CO2 was the only degradation product observed in VC treatments under hypoxic conditions. Because the lower detection limit for DO concentrations measured in the field is typically 0.1 to 0.5 mg/L, these results indicate that oxygen-linked VC and DCE biodegradation can be significant under field conditions that appear anoxic. Furthermore, because rates of VC mineralization exceeded rates of DCE mineralization under hypoxic conditions, DCE accumulation without concomitant accumulation of VC may not be evidence of a DCE degradative “stall” in chloroethene plumes. Significantly, mineralization of VC above the level that could reasonably be attributed to residual DO contamination was also observed in several nominally anoxic (DO minimum detection limit = 0.01 mg/L) microcosm treatments.","language":"English","publisher":"Wiley","doi":"10.1111/j.1745-6592.2011.01339.x","usgsCitation":"Bradley, P.M., and Chapelle, F.H., 2011, Microbial mineralization of dichloroethene and vinyl chloride under hypoxic conditions: Ground Water Monitoring and Remediation, v. 31, no. 4, p. 39-49, https://doi.org/10.1111/j.1745-6592.2011.01339.x.","productDescription":"11 p.","startPage":"39","endPage":"49","costCenters":[{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true},{"id":13634,"text":"South Atlantic Water Science Center","active":true,"usgs":true}],"links":[{"id":474885,"rank":1,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1111/j.1745-6592.2011.01339.x","text":"Publisher Index Page"},{"id":204421,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Georgia","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -81.12030029296875,\n 32.10584293285769\n ],\n [\n -80.80169677734375,\n 32.0383483283312\n ],\n [\n -81.10931396484374,\n 31.70713974681462\n ],\n [\n -81.13677978515625,\n 31.522361470421437\n ],\n [\n -81.26312255859375,\n 31.3348710339506\n ],\n [\n -81.2713623046875,\n 31.194007509998823\n ],\n [\n -81.38397216796875,\n 31.097629956393977\n ],\n [\n -81.375732421875,\n 30.91636380602182\n ],\n [\n -81.42791748046875,\n 30.732392734006083\n ],\n [\n -81.40594482421875,\n 30.61191363386011\n ],\n [\n -81.727294921875,\n 30.704058230919504\n ],\n [\n -81.771240234375,\n 30.746556862773616\n ],\n [\n -81.66961669921875,\n 31.27855085894653\n ],\n [\n -81.38671875,\n 31.84956532831343\n ],\n [\n -81.298828125,\n 32.045332838858506\n ],\n [\n -81.12030029296875,\n 32.10584293285769\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"31","issue":"4","noUsgsAuthors":false,"publicationDate":"2011-05-12","publicationStatus":"PW","scienceBaseUri":"4f4e4a57e4b07f02db62e093","contributors":{"authors":[{"text":"Bradley, Paul M. 0000-0001-7522-8606 pbradley@usgs.gov","orcid":"https://orcid.org/0000-0001-7522-8606","contributorId":361,"corporation":false,"usgs":true,"family":"Bradley","given":"Paul","email":"pbradley@usgs.gov","middleInitial":"M.","affiliations":[{"id":13634,"text":"South Atlantic Water Science Center","active":true,"usgs":true}],"preferred":true,"id":353762,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Chapelle, Francis H. chapelle@usgs.gov","contributorId":1350,"corporation":false,"usgs":true,"family":"Chapelle","given":"Francis","email":"chapelle@usgs.gov","middleInitial":"H.","affiliations":[{"id":13634,"text":"South Atlantic Water Science Center","active":true,"usgs":true},{"id":559,"text":"South Carolina Water Science Center","active":true,"usgs":true}],"preferred":true,"id":353763,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70189371,"text":"70189371 - 2011 - Programming PHREEQC calculations with C++ and Python a comparative study","interactions":[],"lastModifiedDate":"2018-10-03T09:43:21","indexId":"70189371","displayToPublicDate":"2011-11-30T00:00:00","publicationYear":"2011","noYear":false,"publicationType":{"id":24,"text":"Conference Paper"},"publicationSubtype":{"id":19,"text":"Conference Paper"},"title":"Programming PHREEQC calculations with C++ and Python a comparative study","docAbstract":"The new IPhreeqc module provides an application programming interface (API) to facilitate coupling of other codes with the U.S. Geological Survey geochemical model PHREEQC. Traditionally, loose coupling of PHREEQC with other applications required methods to create PHREEQC input files, start external PHREEQC processes, and process PHREEQC output files. IPhreeqc eliminates most of this effort by providing direct access to PHREEQC capabilities through a component object model (COM), a library, or a dynamically linked library (DLL). Input and calculations can be specified through internally programmed strings, and all data exchange between an application and the module can occur in computer memory.
This study compares simulations programmed in C++ and Python that are tightly coupled with IPhreeqc modules to the traditional simulations that are loosely coupled to PHREEQC. The study compares performance, quantifies effort, and evaluates lines of code and the complexity of the design. The comparisons show that IPhreeqc offers a more powerful and simpler approach for incorporating PHREEQC calculations into transport models and other applications that need to perform PHREEQC calculations. The IPhreeqc module facilitates the design of coupled applications and significantly reduces run times. Even a moderate knowledge of one of the supported programming languages allows more efficient use of PHREEQC than the traditional loosely coupled approach.
","largerWorkType":{"id":4,"text":"Book"},"largerWorkTitle":"Proceedings for MODFLOW and More 2011: Integrated Hydrologic Modeling ","largerWorkSubtype":{"id":12,"text":"Conference publication"},"conferenceTitle":"MODFLOW and More 2011: Integrated Hydrologic Modeling ","conferenceDate":"June 5-8, 2011","conferenceLocation":"Golden, Colorado","language":"English","usgsCitation":"Charlton, S.R., Parkhurst, D.L., and Muller, M., 2011, Programming PHREEQC calculations with C++ and Python a comparative study, in Proceedings for MODFLOW and More 2011: Integrated Hydrologic Modeling , Golden, Colorado, June 5-8, 2011, p. 632-636.","productDescription":"5 p. ","startPage":"632","endPage":"636","ipdsId":"IP-029725","costCenters":[{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true},{"id":5044,"text":"National Research Program - Central Branch","active":true,"usgs":true}],"links":[{"id":343653,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":343618,"type":{"id":15,"text":"Index Page"},"url":"https://water.usgs.gov/nrp/proj.bib/Publications/2011/muller_parkhurst_etal_2011.pdf"}],"publishingServiceCenter":{"id":2,"text":"Denver PSC"},"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"59673544e4b0d1f9f05dd7e5","contributors":{"authors":[{"text":"Charlton, Scott R. 0000-0001-7332-3394 charlton@usgs.gov","orcid":"https://orcid.org/0000-0001-7332-3394","contributorId":1632,"corporation":false,"usgs":true,"family":"Charlton","given":"Scott","email":"charlton@usgs.gov","middleInitial":"R.","affiliations":[{"id":5044,"text":"National Research Program - Central Branch","active":true,"usgs":true}],"preferred":true,"id":704408,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Parkhurst, David L. 0000-0003-3348-1544 dlpark@usgs.gov","orcid":"https://orcid.org/0000-0003-3348-1544","contributorId":1088,"corporation":false,"usgs":true,"family":"Parkhurst","given":"David","email":"dlpark@usgs.gov","middleInitial":"L.","affiliations":[{"id":5044,"text":"National Research Program - Central Branch","active":true,"usgs":true}],"preferred":true,"id":704409,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Muller, Mike","contributorId":194513,"corporation":false,"usgs":false,"family":"Muller","given":"Mike","email":"","affiliations":[],"preferred":false,"id":704410,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70006068,"text":"pp1737B - 2011 - Hydrogeologic settings and groundwater-flow simulations for regional investigations of the transport of anthropogenic and natural contaminants to public-supply wells—Investigations begun in 2004","interactions":[],"lastModifiedDate":"2016-08-11T09:13:34","indexId":"pp1737B","displayToPublicDate":"2011-11-29T00:00:00","publicationYear":"2011","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":331,"text":"Professional Paper","code":"PP","onlineIssn":"2330-7102","printIssn":"1044-9612","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"1737","chapter":"B","title":"Hydrogeologic settings and groundwater-flow simulations for regional investigations of the transport of anthropogenic and natural contaminants to public-supply wells—Investigations begun in 2004","docAbstract":"A study of the Transport of Anthropogenic and Natural Contaminants to public-supply wells (TANC study) was begun in 2001 as part of the U.S. Geological Survey National Water-Quality Assessment (NAWQA) Program. The study was designed to shed light on factors that affect the vulnerability of groundwater and, more specifically, water from public-supply wells to contamination to provide a context for the NAWQA Program's earlier finding of mixtures of contaminants at low concentrations in groundwater near the water table in urban areas across the Nation. The TANC study has included investigations at both the regional (tens to thousands of square kilometers) and local (generally less than 25 square kilometers) scales. At the regional scale, the approach to investigation involves refining conceptual models of groundwater flow in hydrologically distinct settings and then constructing or updating a groundwater-flow model with particle tracking for each setting to help quantify regional water budgets, public-supply well contributing areas (areas contributing recharge to wells and zones of contribution for wells), and traveltimes from recharge areas to selected wells. A great deal of information about each contributing area is captured from the model output, including values for 170 variables that describe physical and (or) geochemical characteristics of the contributing areas. The information is subsequently stored in a relational database. Retrospective water-quality data from monitoring, domestic, and many of the public-supply wells, as well as data from newly collected samples at selected public-supply wells, also are stored in the database and are used with the model output to help discern the more important factors affecting vulnerability in many, if not most, settings. The study began with investigations in seven regional areas, and it benefits from being conducted as part of the NAWQA Program, in which consistent methods are used so that meaningful comparisons can be made. The hydrogeologic settings and regional-scale groundwater-flow models from the initial seven regional areas are documented in Chapter A of this U.S. Geological Survey Professional Paper. Also documented in Chapter A are the methods used to collect and compile the water-quality data, determine contributing areas of the public-supply wells, and characterize the oxidation-reduction (redox) conditions in each setting. A data dictionary for the database that was designed to enable joint storage and access to water-quality data and groundwater-flow model particle-tracking output is included as Appendix 1 of Chapter A. This chapter, Chapter B, documents modifications to the study methods and presents descriptions of two regional areas that were added to the TANC study in 2004.
","language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Reston, VA","doi":"10.3133/pp1737B","usgsCitation":"Eberts, S., 2011, Hydrogeologic settings and groundwater-flow simulations for regional investigations of the transport of anthropogenic and natural contaminants to public-supply wells—Investigations begun in 2004: U.S. Geological Survey Professional Paper 1737, vii; Section 1: iii, 6 p.; Section 2: vi, 61 p.; Section 3: v, 51p.; Appendix; PDF Downloads of Sections 1-3; PDF Download of Appendix, https://doi.org/10.3133/pp1737B.","productDescription":"vii; Section 1: iii, 6 p.; Section 2: vi, 61 p.; Section 3: v, 51p.; Appendix; PDF Downloads of Sections 1-3; PDF Download of Appendix","startPage":"i","endPage":"A-8","numberOfPages":"152","onlineOnly":"Y","additionalOnlineFiles":"Y","temporalStart":"2004-01-01","temporalEnd":"2011-11-29","costCenters":[{"id":451,"text":"National Water Quality Assessment Program","active":true,"usgs":true},{"id":583,"text":"Texas Water Science Center","active":true,"usgs":true}],"links":[{"id":116655,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/pp_1737_B.gif"},{"id":110932,"rank":100,"type":{"id":15,"text":"Index Page"},"url":"https://pubs.usgs.gov/pp/2011/1737b/","linkFileType":{"id":5,"text":"html"}},{"id":326385,"rank":101,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/pp/2011/1737b/pdf/pp1737B-111711.pdf","size":"18 MB","linkFileType":{"id":1,"text":"pdf"}}],"country":"United States","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4776e4b07f02db47e513","contributors":{"authors":[{"text":"Eberts, Sandra M. smeberts@usgs.gov","contributorId":2264,"corporation":false,"usgs":true,"family":"Eberts","given":"Sandra M.","email":"smeberts@usgs.gov","affiliations":[{"id":513,"text":"Ohio Water Science Center","active":true,"usgs":true}],"preferred":false,"id":353748,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70006064,"text":"sir20115191 - 2011 - Seepage investigations of the Clackamas River, Oregon","interactions":[],"lastModifiedDate":"2012-03-08T17:16:43","indexId":"sir20115191","displayToPublicDate":"2011-11-28T00:00:00","publicationYear":"2011","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":334,"text":"Scientific Investigations Report","code":"SIR","onlineIssn":"2328-0328","printIssn":"2328-031X","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"2011-5191","title":"Seepage investigations of the Clackamas River, Oregon","docAbstract":"Analysis of streamflow measurements and continuous records of streamflow provided insight into interaction of the groundwater system with the Clackamas River in northwestern Oregon. This report assesses gains and losses of the Clackamas River based on streamflow measurements made during previous hydrologic studies, decades of continuous streamflow data, and a detailed suite of streamflow measurements made in September 2006. Gains and losses were considered significant if, after accounting for tributary inflows and withdrawals, the difference in streamflow from a measurement site to the next site downstream exceeded the streamflow measurement uncertainty. Streamflow measurements made in 1987, 1992, and 1998 indicated minor gains and losses. Comparison of continuous records of late summer streamflow of the Clackamas River at Estacada to sites at Clackamas and Oregon City indicated gains in some years, and no losses. Analysis of streamflow measurements of the Clackamas River from Estacada to Oregon City during low-flow conditions in September 2006 enabled an estimation of gains and losses on a reach-by-reach scale; these gains and losses were attributable to the geomorphic setting. During late summer, most groundwater discharge occurs upstream of Estacada, and groundwater contributions to streamflow downstream of Estacada are minor.","language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Reston, VA","doi":"10.3133/sir20115191","collaboration":"Prepared in cooperation with the Clackamas River Water Providers and Clackamas County Water Environment Services?","usgsCitation":"Lee, K.K., 2011, Seepage investigations of the Clackamas River, Oregon: U.S. Geological Survey Scientific Investigations Report 2011-5191, iv, 16 p., https://doi.org/10.3133/sir20115191.","productDescription":"iv, 16 p.","startPage":"i","endPage":"16","numberOfPages":"20","additionalOnlineFiles":"N","costCenters":[{"id":518,"text":"Oregon Water Science Center","active":true,"usgs":true}],"links":[{"id":116790,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/sir_2011_5191.jpg"},{"id":110928,"rank":100,"type":{"id":15,"text":"Index Page"},"url":"https://pubs.usgs.gov/sir/2011/5191/","linkFileType":{"id":5,"text":"html"}}],"projection":"State Plane, Zone 5076","datum":"NAD 83","country":"United States","state":"Oregon","otherGeospatial":"Clackamas River","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -123,45 ], [ -123,45.5 ], [ -121.5,45.5 ], [ -121.5,45 ], [ -123,45 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e49f5e4b07f02db5f0d77","contributors":{"authors":[{"text":"Lee, Karl K.","contributorId":41050,"corporation":false,"usgs":true,"family":"Lee","given":"Karl","email":"","middleInitial":"K.","affiliations":[],"preferred":false,"id":353743,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70006009,"text":"70006009 - 2011 - On the need for a national (US) research program to elucidate the potential risks to human health and the environment posed by contaminants of emerging concern","interactions":[],"lastModifiedDate":"2020-01-28T08:44:26","indexId":"70006009","displayToPublicDate":"2011-11-25T00:00:00","publicationYear":"2011","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":"On the need for a national (US) research program to elucidate the potential risks to human health and the environment posed by contaminants of emerging concern","docAbstract":"No abstract available.
","language":"English","publisher":"ACS Publications","doi":"10.1021/es200744f","usgsCitation":"Novak, P., Arnold, W., Blazer, V., Halden, R., Klaper, R., Kolpin, D., Kriebel, D., Love, N., Martinovic-Weigelt, D., Patisaul, H., Snyder, S., vom Saal, F.S., and Weisbrod, A., 2011, On the need for a national (US) research program to elucidate the potential risks to human health and the environment posed by contaminants of emerging concern: Environmental Science & Technology, v. 45, no. 9, p. 3829-3830, https://doi.org/10.1021/es200744f.","productDescription":"2 p.","startPage":"3829","endPage":"3830","costCenters":[{"id":351,"text":"Iowa Water Science Center","active":true,"usgs":true},{"id":365,"text":"Leetown Science Center","active":true,"usgs":true},{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":204338,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","volume":"45","issue":"9","noUsgsAuthors":false,"publicationDate":"2011-03-25","publicationStatus":"PW","scienceBaseUri":"4f4e4af3e4b07f02db691b46","contributors":{"authors":[{"text":"Novak, P.J.","contributorId":62737,"corporation":false,"usgs":true,"family":"Novak","given":"P.J.","email":"","affiliations":[],"preferred":false,"id":353649,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Arnold, William A.","contributorId":31105,"corporation":false,"usgs":true,"family":"Arnold","given":"William A.","affiliations":[],"preferred":false,"id":353645,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Blazer, V. S. 0000-0001-6647-9614","orcid":"https://orcid.org/0000-0001-6647-9614","contributorId":56991,"corporation":false,"usgs":true,"family":"Blazer","given":"V. S.","affiliations":[],"preferred":false,"id":353648,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Halden, R.U.","contributorId":101802,"corporation":false,"usgs":true,"family":"Halden","given":"R.U.","affiliations":[],"preferred":false,"id":353654,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Klaper, R.D.","contributorId":72114,"corporation":false,"usgs":true,"family":"Klaper","given":"R.D.","email":"","affiliations":[],"preferred":false,"id":353651,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Kolpin, D.W.","contributorId":87565,"corporation":false,"usgs":true,"family":"Kolpin","given":"D.W.","email":"","affiliations":[],"preferred":false,"id":353652,"contributorType":{"id":1,"text":"Authors"},"rank":6},{"text":"Kriebel, D.","contributorId":104207,"corporation":false,"usgs":true,"family":"Kriebel","given":"D.","affiliations":[],"preferred":false,"id":353655,"contributorType":{"id":1,"text":"Authors"},"rank":7},{"text":"Love, N.G.","contributorId":93617,"corporation":false,"usgs":true,"family":"Love","given":"N.G.","email":"","affiliations":[],"preferred":false,"id":353653,"contributorType":{"id":1,"text":"Authors"},"rank":8},{"text":"Martinovic-Weigelt, D.","contributorId":68875,"corporation":false,"usgs":true,"family":"Martinovic-Weigelt","given":"D.","affiliations":[],"preferred":false,"id":353650,"contributorType":{"id":1,"text":"Authors"},"rank":9},{"text":"Patisaul, H.B.","contributorId":11323,"corporation":false,"usgs":true,"family":"Patisaul","given":"H.B.","email":"","affiliations":[],"preferred":false,"id":353644,"contributorType":{"id":1,"text":"Authors"},"rank":10},{"text":"Snyder, S.A.","contributorId":50647,"corporation":false,"usgs":true,"family":"Snyder","given":"S.A.","email":"","affiliations":[],"preferred":false,"id":353647,"contributorType":{"id":1,"text":"Authors"},"rank":11},{"text":"vom Saal, F. S.","contributorId":107025,"corporation":false,"usgs":true,"family":"vom Saal","given":"F.","email":"","middleInitial":"S.","affiliations":[],"preferred":false,"id":353656,"contributorType":{"id":1,"text":"Authors"},"rank":12},{"text":"Weisbrod, A.V.","contributorId":43907,"corporation":false,"usgs":true,"family":"Weisbrod","given":"A.V.","email":"","affiliations":[],"preferred":false,"id":353646,"contributorType":{"id":1,"text":"Authors"},"rank":13}]}} ,{"id":70005558,"text":"70005558 - 2011 - Role of back diffusion and biodegradation reactions in sustaining an MTBE/TBA plume in alluvial media","interactions":[],"lastModifiedDate":"2020-01-11T11:25:36","indexId":"70005558","displayToPublicDate":"2011-11-25T00:00:00","publicationYear":"2011","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2233,"text":"Journal of Contaminant Hydrology","active":true,"publicationSubtype":{"id":10}},"title":"Role of back diffusion and biodegradation reactions in sustaining an MTBE/TBA plume in alluvial media","docAbstract":"A methyl tert-butyl ether (MTBE) / tert-butyl alcohol (TBA) plume originating from a gasoline spill in late 1994 at Vandenberg Air Force Base (VAFB) persisted for over 15 years within 200 feet of the original spill source. The plume persisted until 2010 despite excavation of the tanks and piping within months after the spill and excavations of additional contaminated sediments from the source area in 2007 and 2008. The probable history of MTBE concentrations along the plume centerline at its source was estimated using a wide variety of available information, including published details about the original spill, excavations and monitoring by VAFB consultants, and our own research data. Two-dimensional reactive transport simulations of MTBE along the plume centerline were conducted for a 20-year period following the spill. These analyses suggest that MTBE diffused from the thin anaerobic aquifer into the adjacent anaerobic silts and transformed to TBA in both aquifer and silt layers. The model reproduces the observation that after 2004 TBA was the dominant solute, diffusing back out of the silts into the aquifer and sustaining plume concentrations much longer than would have been the case in the absence of such diffusive exchange. Simulations also suggest that aerobic degradation of MTBE or TBA at the water table in the overlying silt layer significantly affected concentrations of MTBE and TBA by limiting the chemical mass available for back diffusion to the aquifer.","language":"English","publisher":"Elsevier","doi":"10.1016/j.jconhyd.2011.08.006","usgsCitation":"Rasa, E., Chapman, S.W., Bekins, B.A., Fogg, G., Scow, K.M., and Mackay, D.M., 2011, Role of back diffusion and biodegradation reactions in sustaining an MTBE/TBA plume in alluvial media: Journal of Contaminant Hydrology, v. 126, no. 3-4, p. 235-247, https://doi.org/10.1016/j.jconhyd.2011.08.006.","productDescription":"13 p.","startPage":"235","endPage":"247","costCenters":[{"id":148,"text":"Branch of Regional Research-Western Region","active":false,"usgs":true},{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":474889,"rank":1,"type":{"id":41,"text":"Open Access External Repository Page"},"url":"https://www.ncbi.nlm.nih.gov/pmc/articles/3267905","text":"External Repository"},{"id":204366,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"California","otherGeospatial":"Vandenberg Air Force Base","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -120.68206787109375,\n 34.6241677899049\n ],\n [\n -120.40740966796875,\n 34.6241677899049\n ],\n [\n -120.40740966796875,\n 34.77771580360469\n ],\n [\n -120.68206787109375,\n 34.77771580360469\n ],\n [\n -120.68206787109375,\n 34.6241677899049\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"126","issue":"3-4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4aafe4b07f02db66cca2","contributors":{"authors":[{"text":"Rasa, Ehsan","contributorId":20461,"corporation":false,"usgs":true,"family":"Rasa","given":"Ehsan","email":"","affiliations":[],"preferred":false,"id":352798,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Chapman, Steven W.","contributorId":35867,"corporation":false,"usgs":true,"family":"Chapman","given":"Steven","email":"","middleInitial":"W.","affiliations":[],"preferred":false,"id":352800,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Bekins, Barbara A. 0000-0002-1411-6018 babekins@usgs.gov","orcid":"https://orcid.org/0000-0002-1411-6018","contributorId":1348,"corporation":false,"usgs":true,"family":"Bekins","given":"Barbara","email":"babekins@usgs.gov","middleInitial":"A.","affiliations":[{"id":438,"text":"National Research Program - Western Branch","active":true,"usgs":true},{"id":37277,"text":"WMA - Earth System Processes Division","active":true,"usgs":true},{"id":36183,"text":"Hydro-Ecological Interactions Branch","active":true,"usgs":true},{"id":436,"text":"National Research Program - Eastern Branch","active":true,"usgs":true}],"preferred":true,"id":352797,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Fogg, Graham E.","contributorId":68779,"corporation":false,"usgs":true,"family":"Fogg","given":"Graham E.","affiliations":[],"preferred":false,"id":352801,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Scow, Kate M.","contributorId":100519,"corporation":false,"usgs":true,"family":"Scow","given":"Kate","email":"","middleInitial":"M.","affiliations":[],"preferred":false,"id":352802,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Mackay, Douglas M.","contributorId":22081,"corporation":false,"usgs":true,"family":"Mackay","given":"Douglas","email":"","middleInitial":"M.","affiliations":[],"preferred":false,"id":352799,"contributorType":{"id":1,"text":"Authors"},"rank":6}]}} ,{"id":70006010,"text":"70006010 - 2011 - Occurrence of antibiotic resistance and characterization of resistant genes and integrons in Enterobacteriaceae isolated from integrated fish farms south China","interactions":[],"lastModifiedDate":"2021-04-29T18:31:00.477796","indexId":"70006010","displayToPublicDate":"2011-11-25T00:00:00","publicationYear":"2011","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2259,"text":"Journal of Environmental Monitoring","active":true,"publicationSubtype":{"id":10}},"title":"Occurrence of antibiotic resistance and characterization of resistant genes and integrons in Enterobacteriaceae isolated from integrated fish farms south China","docAbstract":"Antibiotics are still widely applied in animal husbandry to prevent diseases and used as feed additives to promote animal growth. This could result in antibiotic resistance to bacteria and antibiotic residues in animals. In this paper, Enterobacteriaceae isolated from four integrated fish farms in Zhongshan, South China were tested for antibiotic resistance, tetracycline resistance genes, sulfonamide resistance genes, and class 1 integrons. The Kirby-Bauer disk diffusion method and polymerase chain reaction (PCR) assays were carried out to test antibiotic susceptibility and resistance genes, respectively. Relatively high antibiotic resistance frequencies were found, especially for ampicillin (80%), tetracycline (52%), and trimethoprim (50%). Out of 203 Enterobacteriaceae isolates, 98.5% were resistant to one or more antibiotics tested. Multiple antibiotic resistance (MAR) was found highest in animal manures with a MAR index of 0.56. Tetracycline resistance genes (tet(A), tet(C)) and sulfonamide resistance genes (sul2) were detected in more than 50% of the isolates. The intI1gene was found in 170 isolates (83.7%). Both classic and non-classic class 1 integrons were found. Four genes, aadA5, aadA22, dfr2, and dfrA17, were detected. To our knowledge, this is the first report for molecular characterization of antibiotic resistance genes in Enterobacteriaceae isolated from integrated fish farms in China and the first time that gene cassette arraydfrA17-aadA5 has been detected in such fish farms. Results of this study indicated that fish farms may be a reservoir of highly diverse and abundant antibiotic resistant genes and gene cassettes. Integrons may play a key role in multiple antibiotic resistances posing potential health risks to the general public and aquaculture.
The unsaturated zone plays an extremely important hydrologic role that influences water quality and quantity, ecosystem function and health, the connection between atmospheric and terrestrial processes, nutrient cycling, soil development, and natural hazards such as flooding and landslides. Unsaturated hydraulic conductivity is one of the main properties considered to govern flow; however it is very difficult to measure accurately. Knowledge of the highly nonlinear relationship between unsaturated hydraulic conductivity (K) and volumetric water content () is required for widely-used models of water flow and solute transport processes in the unsaturated zone. Measurement of unsaturated hydraulic conductivity of sediments is costly and time consuming, therefore use of models that estimate this property from more easily measured bulk-physical properties is common. In hydrologic studies, calculations based on property-transfer models informed by hydraulic property databases are often used in lieu of measured data from the site of interest. Reliance on database-informed predicted values with the use of neural networks has become increasingly common. Hydraulic properties predicted using databases may be adequate in some applications, but not others.
\nThis chapter will discuss, by way of examples, various techniques used to measure and model hydraulic conductivity as a function of water content, K(). The parameters that describe the K() curve obtained by different methods are used directly in Richards’ equation-based numerical models, which have some degree of sensitivity to those parameters. This chapter will explore the complications of using laboratory measured or estimated properties for field scale investigations to shed light on how adequately the processes are represented. Additionally, some more recent concepts for representing unsaturated-zone flow processes will be discussed.
","largerWorkType":{"id":4,"text":"Book"},"largerWorkTitle":"Hydraulic conductivity - Issues, determination and applications","largerWorkSubtype":{"id":15,"text":"Monograph"},"language":"English","publisher":"InTech","doi":"10.5772/20017","usgsCitation":"Perkins, K., 2011, Measurement and modeling of unsaturated hydraulic conductivity, chap. 21 of Hydraulic conductivity - Issues, determination and applications, p. 419-434, https://doi.org/10.5772/20017.","productDescription":"17 p.","startPage":"419","endPage":"434","numberOfPages":"17","onlineOnly":"N","additionalOnlineFiles":"N","ipdsId":"IP-029436","costCenters":[],"links":[{"id":474891,"rank":0,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.5772/20017","text":"Publisher Index Page"},{"id":310730,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"noUsgsAuthors":false,"publicationDate":"2011-11-23","publicationStatus":"PW","scienceBaseUri":"5631f1f6e4b0c1dd0339e4ea","contributors":{"editors":[{"text":"Elango, Lakshmanan","contributorId":147284,"corporation":false,"usgs":false,"family":"Elango","given":"Lakshmanan","email":"","affiliations":[],"preferred":false,"id":578594,"contributorType":{"id":2,"text":"Editors"},"rank":1}],"authors":[{"text":"Perkins, Kim S. 0000-0001-8349-447X","orcid":"https://orcid.org/0000-0001-8349-447X","contributorId":44097,"corporation":false,"usgs":true,"family":"Perkins","given":"Kim S.","affiliations":[],"preferred":false,"id":578593,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70003740,"text":"70003740 - 2011 - Response to comments on \"A bacterium that can grow using arsenic instead of phosphorus\"","interactions":[],"lastModifiedDate":"2020-01-11T11:37:36","indexId":"70003740","displayToPublicDate":"2011-11-23T00:00:00","publicationYear":"2011","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3338,"text":"Science","active":true,"publicationSubtype":{"id":10}},"title":"Response to comments on \"A bacterium that can grow using arsenic instead of phosphorus\"","docAbstract":"Concerns have been raised about our recent study suggesting that arsenic (As) substitutes for phosphorus in major biomolecules of a bacterium that tolerates extreme As concentrations. We welcome the opportunity to better explain our methods and results and to consider alternative interpretations. We maintain that our interpretation of As substitution, based on multiple congruent lines of evidence, is viable.","language":"English","publisher":"American Association for the Advancement of Science","doi":"10.1126/science.1202098","usgsCitation":"Wolfe-Simon, F., Blum, J.S., Kulp, T., Gordon, G.W., Hoeft, S.E., Pett-Ridge, J., Stolz, J.F., Webb, S.M., Weber, P.K., Davies, P.C., Anbar, A.D., and Oremland, R.S., 2011, Response to comments on \"A bacterium that can grow using arsenic instead of phosphorus\": Science, v. 332, no. 6034, https://doi.org/10.1126/science.1202098.","productDescription":"4 p.","startPage":"1149","costCenters":[{"id":148,"text":"Branch of Regional Research-Western Region","active":false,"usgs":true},{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":474894,"rank":1,"type":{"id":41,"text":"Open Access External Repository Page"},"url":"https://www.osti.gov/biblio/1021547","text":"External Repository"},{"id":204524,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"332","issue":"6034","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4780e4b07f02db482319","contributors":{"authors":[{"text":"Wolfe-Simon, Felisa","contributorId":91750,"corporation":false,"usgs":true,"family":"Wolfe-Simon","given":"Felisa","email":"","affiliations":[],"preferred":false,"id":348615,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Blum, Jodi Switzer","contributorId":96946,"corporation":false,"usgs":true,"family":"Blum","given":"Jodi","email":"","middleInitial":"Switzer","affiliations":[],"preferred":false,"id":348617,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Kulp, Thomas R.","contributorId":58364,"corporation":false,"usgs":true,"family":"Kulp","given":"Thomas R.","affiliations":[],"preferred":false,"id":348611,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Gordon, Gwyneth W.","contributorId":94165,"corporation":false,"usgs":true,"family":"Gordon","given":"Gwyneth","email":"","middleInitial":"W.","affiliations":[],"preferred":false,"id":348616,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Hoeft, Shelley E.","contributorId":54077,"corporation":false,"usgs":true,"family":"Hoeft","given":"Shelley","email":"","middleInitial":"E.","affiliations":[],"preferred":false,"id":348610,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Pett-Ridge, Jennifer","contributorId":6726,"corporation":false,"usgs":true,"family":"Pett-Ridge","given":"Jennifer","email":"","affiliations":[],"preferred":false,"id":348607,"contributorType":{"id":1,"text":"Authors"},"rank":6},{"text":"Stolz, John F.","contributorId":47225,"corporation":false,"usgs":true,"family":"Stolz","given":"John","email":"","middleInitial":"F.","affiliations":[],"preferred":false,"id":348609,"contributorType":{"id":1,"text":"Authors"},"rank":7},{"text":"Webb, Samuel M.","contributorId":62088,"corporation":false,"usgs":true,"family":"Webb","given":"Samuel","email":"","middleInitial":"M.","affiliations":[],"preferred":false,"id":348612,"contributorType":{"id":1,"text":"Authors"},"rank":8},{"text":"Weber, Peter K.","contributorId":28868,"corporation":false,"usgs":true,"family":"Weber","given":"Peter","email":"","middleInitial":"K.","affiliations":[],"preferred":false,"id":348608,"contributorType":{"id":1,"text":"Authors"},"rank":9},{"text":"Davies, Paul C.W.","contributorId":63686,"corporation":false,"usgs":true,"family":"Davies","given":"Paul","email":"","middleInitial":"C.W.","affiliations":[],"preferred":false,"id":348613,"contributorType":{"id":1,"text":"Authors"},"rank":10},{"text":"Anbar, Ariel D.","contributorId":88222,"corporation":false,"usgs":true,"family":"Anbar","given":"Ariel","email":"","middleInitial":"D.","affiliations":[],"preferred":false,"id":348614,"contributorType":{"id":1,"text":"Authors"},"rank":11},{"text":"Oremland, Ronald S. 0000-0001-7382-0147 roremlan@usgs.gov","orcid":"https://orcid.org/0000-0001-7382-0147","contributorId":931,"corporation":false,"usgs":true,"family":"Oremland","given":"Ronald","email":"roremlan@usgs.gov","middleInitial":"S.","affiliations":[{"id":438,"text":"National Research Program - 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The helicopter electromagnetic and magnetic surveys were flown on March 16–17, 2007, in four areas of the Hunton anticline in south-central Oklahoma. The objective of this project is to improve the understanding of the geohydrologic framework of the Arbuckle-Simpson aquifer. The electromagnetic sensor for the helicopter electromagnetic survey consisted of six different transmitter-receiver orientations that measured the earth's electrical response at six distinct frequencies from approximately 500 Hertz to approximately 115,000 Hertz. The electromagnetic measurements were converted to electrical resistivity values, which were gridded and plotted on georeferenced maps. The map from each frequency represents a different depth of investigation for each area. The range of subsurface investigation is comparable to the depth of shallow groundwater. The four areas selected for the helicopter electromagnetic study, blocks A–D, have different geologic and hydrologic settings. 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Sulfate concentrations in precipitation decreased at a rate of −0.15 to −0.55 μeq/l/year at 10 high-elevation National Atmospheric Deposition Program stations in the state during 1987–2008 reflecting regional reductions in SO2 emissions. In lakes where sulfate is primarily derived from atmospheric inputs, sulfate concentrations also decreased although the rates generally were less, ranging from −0.12 to −0.27 μeq/l/year. The similarity in timing and sulfur isotopic data support the hypothesis that decreases in atmospheric deposition are driving the response of high-elevation lakes in some areas of the state. By contrast, in lakes where sulfate is derived primarily from watershed weathering sources, sulfate concentrations showed sharp increases during 1985–2008. Analysis of long-term climate records indicates that annual air temperatures have increased between 0.45 and 0.93°C per decade throughout most mountainous areas of Colorado, suggesting climate as a factor. 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","language":"English","publisher":"Springer","publisherLocation":"Amsterdam, Netherlands","doi":"10.1007/s10533-010-9443-4","usgsCitation":"Mast, M.A., Turk, J.T., Clow, D.W., and Campbell, D.D., 2011, Response of lake chemistry to changes in atmospheric deposition and climate in three high-elevation wilderness areas of Colorado: Biogeochemistry, v. 103, no. 1-3, p. 27-43, https://doi.org/10.1007/s10533-010-9443-4.","productDescription":"17 p.","startPage":"27","endPage":"43","temporalStart":"1985-01-01","temporalEnd":"2008-12-31","costCenters":[{"id":191,"text":"Colorado Water Science Center","active":true,"usgs":true}],"links":[{"id":204181,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Colorado","otherGeospatial":"Flat Tops Wilderness Area, Mount Zirkel Wilderness Area, Weminuche Wilderness Area","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -107.5396728515625,\n 40.51797520038851\n ],\n [\n -106.28173828125,\n 40.51797520038851\n ],\n [\n -106.28173828125,\n 40.9964840143779\n ],\n [\n -107.5396728515625,\n 40.9964840143779\n ],\n [\n -107.5396728515625,\n 40.51797520038851\n ]\n ]\n ]\n }\n },\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -107.65502929687499,\n 39.740986355883564\n ],\n [\n -107.017822265625,\n 39.740986355883564\n ],\n [\n -107.017822265625,\n 40.13269100586688\n ],\n [\n -107.65502929687499,\n 40.13269100586688\n ],\n [\n -107.65502929687499,\n 39.740986355883564\n ]\n ]\n ]\n }\n },\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -107.8472900390625,\n 37.29153547292737\n ],\n [\n -106.8310546875,\n 37.29153547292737\n ],\n [\n -106.8310546875,\n 37.83148014503288\n ],\n [\n -107.8472900390625,\n 37.83148014503288\n ],\n [\n -107.8472900390625,\n 37.29153547292737\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"103","issue":"1-3","noUsgsAuthors":false,"publicationDate":"2010-04-28","publicationStatus":"PW","scienceBaseUri":"4f4e4a4ee4b07f02db62836b","contributors":{"authors":[{"text":"Mast, M. Alisa 0000-0001-6253-8162 mamast@usgs.gov","orcid":"https://orcid.org/0000-0001-6253-8162","contributorId":827,"corporation":false,"usgs":true,"family":"Mast","given":"M.","email":"mamast@usgs.gov","middleInitial":"Alisa","affiliations":[{"id":191,"text":"Colorado Water Science Center","active":true,"usgs":true}],"preferred":true,"id":348968,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Turk, John T.","contributorId":53363,"corporation":false,"usgs":true,"family":"Turk","given":"John","email":"","middleInitial":"T.","affiliations":[],"preferred":false,"id":348971,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Clow, David W. 0000-0001-6183-4824 dwclow@usgs.gov","orcid":"https://orcid.org/0000-0001-6183-4824","contributorId":1671,"corporation":false,"usgs":true,"family":"Clow","given":"David","email":"dwclow@usgs.gov","middleInitial":"W.","affiliations":[{"id":191,"text":"Colorado Water Science Center","active":true,"usgs":true}],"preferred":true,"id":348969,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Campbell, Donald D.","contributorId":23021,"corporation":false,"usgs":true,"family":"Campbell","given":"Donald","email":"","middleInitial":"D.","affiliations":[],"preferred":false,"id":348970,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ]}