Clear-cut logging followed by agricultural activity caused hydrologic and geomorphic changes in North Fish Creek, a Wisconsin tributary to Lake Superior. Hydro-geomorphic responses to changes in land use were sensitive to the location of reaches along the main stem and to the relative timing of large floods. Hydrologic and sediment-load modeling indicates that flood peaks were three times larger and sediment loads were five times larger during maximum agricultural activity in the 1920s and 1930s than prior to about 1890, when forest cover was dominant. Following logging, overbank sedimentation rates in the lower main stem increased four to six times above pre-settlement rates. Accelerated streambank and channel erosion in the upper main stem have been and continue to be primary sources of sediment to downstream reaches. Extreme floods in 1941 and 1946, followed by frequent moderate floods through 1954, caused extensive geomorphic changes along the entire main stem. Sedimentation rates in the lower main stem may have decreased in the last several decades as agricultural activity declined. However, geomorphic recovery is slow, as incised channels in the upper main stem function as efficient conveyors of watershed surface runoff and thereby continue to promote flooding and sedimentation problems downstream.
","language":"English","publisher":"Taylor & Francis","doi":"10.1080/02723646.2000.10642701","issn":"02723646","usgsCitation":"Fitzpatrick, F., and Knox, J., 2000, Spatial and temporal sensitivity of hydrogeomorphic response and recovery to deforestation, agriculture, and floods: Physical Geography, v. 21, no. 2, p. 89-108, https://doi.org/10.1080/02723646.2000.10642701.","productDescription":"20 p.","startPage":"89","endPage":"108","costCenters":[],"links":[{"id":230758,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Wisconsin","otherGeospatial":"Lake Superior, North Fish Creek","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -91.1151123046875,\n 46.56122097002429\n ],\n [\n -91.15116119384764,\n 46.55319428348575\n ],\n [\n -91.14704132080078,\n 46.52060318945508\n ],\n [\n -90.90911865234374,\n 46.586709628118015\n ],\n [\n -90.94242095947266,\n 46.605582392244486\n ],\n [\n -91.1151123046875,\n 46.56122097002429\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"21","issue":"2","noUsgsAuthors":false,"publicationDate":"2013-05-15","publicationStatus":"PW","scienceBaseUri":"505b9444e4b08c986b31a989","contributors":{"authors":[{"text":"Fitzpatrick, F. A. 0000-0002-9748-7075","orcid":"https://orcid.org/0000-0002-9748-7075","contributorId":61446,"corporation":false,"usgs":true,"family":"Fitzpatrick","given":"F. A.","affiliations":[],"preferred":false,"id":393660,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Knox, J.C.","contributorId":39970,"corporation":false,"usgs":true,"family":"Knox","given":"J.C.","email":"","affiliations":[],"preferred":false,"id":393659,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70022449,"text":"70022449 - 2000 - Hydrologic influences on soil properties along ephemeral rivers in the Namib Desert","interactions":[],"lastModifiedDate":"2012-03-12T17:19:43","indexId":"70022449","displayToPublicDate":"2000-01-01T00:00:00","publicationYear":"2000","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2183,"text":"Journal of Arid Environments","active":true,"publicationSubtype":{"id":10}},"title":"Hydrologic influences on soil properties along ephemeral rivers in the Namib Desert","docAbstract":"Soils were examined along three ephemeral rivers in the Namib Desert to assess the influence of their hydrologic characteristics on soil properties. Soils consisted of layers of fluvially deposited, organic-rich silts, interstratified with fluvial and aeolian sands. The most significant influence of the ephemeral hydrologic regime upon soils was related to the downstream alluviation associated with hydrologic decay. This alluviation increased the silt proportion of soils in the lower reaches of the rivers. Organic carbon, nitrogen and phosphorous were correlated with silt content, and silt deposition patterns influenced patterns of moisture availability and plant rooting, creating and maintaining micro-habitats for various organisms. Localized salinization occurred in association with wetland sites and soluble salt content tended to increase downstream. Because of the covariance between silt and macronutrients, and the influence of silt upon moisture availability and habitat suitability, alluviation patterns associated with the hydrologic regime strongly influence the structure, productivity, and spatial distribution of biotic communities in ephemeral river ecosystems. (C) 2000 Academic Press.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Journal of Arid Environments","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1006/jare.1999.0619","issn":"01401963","usgsCitation":"Jacobson, P., Jacobson, K., Angermeier, P., and Cherry, D., 2000, Hydrologic influences on soil properties along ephemeral rivers in the Namib Desert: Journal of Arid Environments, v. 45, no. 1, p. 21-34, https://doi.org/10.1006/jare.1999.0619.","startPage":"21","endPage":"34","numberOfPages":"14","costCenters":[],"links":[{"id":230723,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":206756,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1006/jare.1999.0619"}],"volume":"45","issue":"1","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a363ae4b0c8380cd60548","contributors":{"authors":[{"text":"Jacobson, P.J.","contributorId":18529,"corporation":false,"usgs":true,"family":"Jacobson","given":"P.J.","email":"","affiliations":[],"preferred":false,"id":393654,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Jacobson, K.M.","contributorId":105465,"corporation":false,"usgs":true,"family":"Jacobson","given":"K.M.","email":"","affiliations":[],"preferred":false,"id":393656,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Angermeier, P. L. 0000-0003-2864-170X","orcid":"https://orcid.org/0000-0003-2864-170X","contributorId":6410,"corporation":false,"usgs":true,"family":"Angermeier","given":"P. L.","affiliations":[],"preferred":false,"id":393653,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Cherry, D.S.","contributorId":87321,"corporation":false,"usgs":true,"family":"Cherry","given":"D.S.","email":"","affiliations":[],"preferred":false,"id":393655,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70022390,"text":"70022390 - 2000 - Influence of a nonionic surfactant (Triton X-100) on contaminant distribution between water and several soil solids","interactions":[],"lastModifiedDate":"2018-12-10T10:55:25","indexId":"70022390","displayToPublicDate":"2000-01-01T00:00:00","publicationYear":"2000","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2222,"text":"Journal of Colloid and Interface Science","active":true,"publicationSubtype":{"id":10}},"title":"Influence of a nonionic surfactant (Triton X-100) on contaminant distribution between water and several soil solids","docAbstract":"The influence of a nonionic surfactant (Triton X-100) on the contaminant distribution coefficients in solid–water mixtures was determined for a number of relatively nonpolar compounds (contaminants) on several natural solids. The studied compounds consisted of BTEX (benzene, toluene, ethylbenzene, and p-xylene) and chlorinated pesticides (lindane, α-BHC, and heptachlor epoxide), which span several orders of magnitude in water solubility (Sw); the solid samples comprised a bentonite, a peat, and two other soils, which cover a wide range of solid organic matter (SOM) content. The applied surfactant concentrations (X) ranged from below the (nominal) CMC to 2–3 times the CMC. For relatively water-soluble BTEX compounds, the distribution coefficients with surfactant (Kd*) all exceeded those without surfactant (Kd); the Kd*/Kd ratios increased with increasing Swfrom p-xylene to benzene on each solid at a given X, with increasing X for each compound on a solid, and with decreasing solid SOM content for each compound over the range of X studied. For the less-soluble pesticides, the Kd*/Kdratios exhibited a large increase with X for bentonite, a marginal change (increase or decrease) for a soil of 2.4% SOM, and a moderate-to-large decrease for two soils of 14.8% and 86.4% SOM. These unique observations were rationalized in terms of the properties of the compound, the amount of surfactant sorbed on the solid, the enhanced solubilization of the compound by surfactant in water, and the relative effects of the surfactant when adsorbed on minerals and when partitioned into SOM.
An 18-day microcosm study was conducted to evaluate the influence of acid volatile sulfides (AVS) and metal additions on bioaccumulation from sediments of Cd, Ni, and Zn in two clams (Macoma balthica and Potamocorbula amurensis) and three marine polychaetes (Neanthes arenaceodentata, Heteromastus filiformis, and Spiophanes missionensis). Manipulation of AVS by oxidation of naturally anoxic sediments allowed use of metal concentrations typical of nature and evaluation of processes important to chronic metal exposure. A vertical sediment column similar to that often found in nature was used to facilitate realistic biological behavior. Results showed that AVS or porewater (PW) metals controlled bioaccumulation in only 2 of 15 metal-animal combinations. Bioaccumulation of all three metals by the bivalves was related significantly to metal concentrations extracted from sediments (SEM) but not to [SEM − AVS] or PW metals. SEM predominantly influenced bioaccumulation of Ni and Zn in N. arenaceodentata, but Cd bioaccumulation followed PW Cd concentrations. SEM controlled tissue concentrations of all three metals in H. filiformis and S. missionensis, with minor influences from metal-sulfide chemistry. Significant bioaccumulation occurred when SEM was only a small fraction of AVS in several treatments. Three factors appeared to contribute to the differences between these bioaccumulation results and the results from toxicity tests reported previously: differences in experimental design, dietary uptake, and biological attributes of the species, including mode and depth of feeding.
Recent work has emphasized development of full‐range water‐retention functions that are applicable under both wet and dry soil conditions, but evaluation of such functions in numerical modeling has been limited. Here we show that simulations using the Rossi‐Nimmo (RN) full‐range function compared favorably with those using the common Brooks‐Corey function and that the RN function can improve prediction of water potentials in near‐surface soil, particularly under dry conditions. Simulations using the RN function also improved prediction of temperatures throughout the soil profile. Such improvements could be important for calculations of liquid and vapor flow in near‐surface soils and in deep unsaturated zones of arid and semiarid regions.
","language":"English","publisher":"American Geophysical Union","doi":"10.1029/2000WR900193","usgsCitation":"Andraski, B.J., and Jacobson, E.A., 2000, Testing a full‐range soil‐water retention function in modeling water potential and temperature: Water Resources Research, v. 36, no. 10, p. 3081-3089, https://doi.org/10.1029/2000WR900193.","productDescription":"9 p.","startPage":"3081","endPage":"3089","costCenters":[{"id":465,"text":"Nevada Water Science Center","active":true,"usgs":true},{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":479206,"rank":1,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1029/2000wr900193","text":"Publisher Index Page"},{"id":230792,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"36","issue":"10","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505ba5b7e4b08c986b320c0f","contributors":{"authors":[{"text":"Andraski, Brian J. 0000-0002-2086-0417 andraski@usgs.gov","orcid":"https://orcid.org/0000-0002-2086-0417","contributorId":168800,"corporation":false,"usgs":true,"family":"Andraski","given":"Brian","email":"andraski@usgs.gov","middleInitial":"J.","affiliations":[{"id":38175,"text":"Toxics Substances Hydrology Program","active":true,"usgs":true},{"id":465,"text":"Nevada Water Science Center","active":true,"usgs":true},{"id":438,"text":"National Research Program - Western Branch","active":true,"usgs":true}],"preferred":false,"id":393246,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Jacobson, Elizabeth A.","contributorId":45480,"corporation":false,"usgs":false,"family":"Jacobson","given":"Elizabeth","email":"","middleInitial":"A.","affiliations":[],"preferred":false,"id":393245,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70022341,"text":"70022341 - 2000 - Regional interdisciplinary paleoflood approach to assess extreme flood potential","interactions":[],"lastModifiedDate":"2018-03-27T17:00:06","indexId":"70022341","displayToPublicDate":"2000-01-01T00:00:00","publicationYear":"2000","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3722,"text":"Water Resources Research","onlineIssn":"1944-7973","printIssn":"0043-1397","active":true,"publicationSubtype":{"id":10}},"title":"Regional interdisciplinary paleoflood approach to assess extreme flood potential","docAbstract":"In the past decade, there has been a growing interest of dam safety officials to incorporate a risk‐based analysis for design‐flood hydrology. Extreme or rare floods, with probabilities in the range of about 10−3 to 10−7 chance of occurrence per year, are of continuing interest to the hydrologic and engineering communities for purposes of planning and design of structures such as dams [National Research Council, 1988]. The National Research Council stresses that as much information as possible about floods needs to be used for evaluation of the risk and consequences of any decision. A regional interdisciplinary paleoflood approach was developed to assist dam safety officials and floodplain managers in their assessments of the risk of large floods. The interdisciplinary components included documenting maximum paleofloods and a regional analyses of contemporary extreme rainfall and flood data to complement a site‐specific probable maximum precipitation study [Tomlinson and Solak, 1997]. The cost‐effective approach, which can be used in many other hydrometeorologic settings, was applied to Elkhead Reservoir in Elkhead Creek (531 km2) in northwestern Colorado; the regional study area was 10,900 km2. Paleoflood data using bouldery flood deposits and noninundation surfaces for 88 streams were used to document maximum flood discharges that have occurred during the Holocene. Several relative dating methods were used to determine the age of paleoflood deposits and noninundation surfaces. No evidence of substantial flooding was found in the study area. The maximum paleoflood of 135 m3 s−1 for Elkhead Creek is about 13% of the site‐specific probable maximum flood of 1020 m3 s−1. Flood‐frequency relations using the expected moments algorithm, which better incorporates paleoflood data, were developed to assess the risk of extreme floods. Envelope curves encompassing maximum rainfall (181 sites) and floods (218 sites) were developed for northwestern Colorado to help define maximum contemporary and Holocene flooding in Elkhead Creek and in a regional frequency context. Study results for Elkhead Reservoir were accepted by the Colorado State Engineer for dam safety certification.
","language":"English","publisher":"American Geophysical Union","doi":"10.1029/2000WR900098","usgsCitation":"Jarrett, R.D., and Tomlinson, E.M., 2000, Regional interdisciplinary paleoflood approach to assess extreme flood potential: Water Resources Research, v. 36, no. 10, p. 2957-2984, https://doi.org/10.1029/2000WR900098.","productDescription":"28 p.","startPage":"2957","endPage":"2984","ipdsId":"IP-027734","costCenters":[{"id":5044,"text":"National Research Program - Central Branch","active":true,"usgs":true}],"links":[{"id":479207,"rank":1,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1029/2000wr900098","text":"Publisher Index Page"},{"id":230791,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"36","issue":"10","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"50e4a532e4b0e8fec6cdbd74","contributors":{"authors":[{"text":"Jarrett, Robert D. rjarrett@usgs.gov","contributorId":2260,"corporation":false,"usgs":true,"family":"Jarrett","given":"Robert","email":"rjarrett@usgs.gov","middleInitial":"D.","affiliations":[],"preferred":true,"id":393243,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Tomlinson, Edward M.","contributorId":195306,"corporation":false,"usgs":false,"family":"Tomlinson","given":"Edward","email":"","middleInitial":"M.","affiliations":[],"preferred":false,"id":393244,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70022339,"text":"70022339 - 2000 - Mobilization of arsenite by dissimilatory reduction of adsorbed arsenate","interactions":[],"lastModifiedDate":"2020-01-05T15:02:55","indexId":"70022339","displayToPublicDate":"2000-01-01T00:00:00","publicationYear":"2000","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":"Mobilization of arsenite by dissimilatory reduction of adsorbed arsenate","docAbstract":"Sulfurospirillum barnesii is capable of anaerobic growth using ferric iron or arsenate as electron acceptors. Cell suspensions of S. barnesii were able to reduce arsenate to arsenite when the former oxyanion was dissolved in solution, or when it was adsorbed onto the surface of ferrihydrite, a common soil mineral, by a variety of mechanisms (e.g., coprecipitation, presorption). Reduction of Fe(III) in ferrihydrite to soluble Fe(II) also occurred, but dissolution of ferrihydrite was not required in order for adsorbed arsenate reduction to be achieved. This was illustrated by bacterial reduction of arsenate coprecipitated with aluminum hydroxide, a mineral that does not undergo reductive dissolution. The rate of arsenate reduction was influenced by the method in which arsenate became associated with the mineral phases and may have been strongly coupled with arsenate desorption rates. The extent of release of arsenite into solution was governed by adsorption of arsenite onto the ferrihydrite or alumina phases. The results of these experiments have interpretive significance to the mobilization of arsenic in large alluvial aquifers, such as those of the Ganges in India and Bangladesh, and in the hyporheic zones of contaminated streams.Sulfurospirillum barnesii is capable of anaerobic growth using ferric iron or arsenate as electron acceptors. Cell suspensions of S. barnesii were able to reduce arsenate to arsenite when the former oxyanion was dissolved in solution, or when it was adsorbed onto the surface of ferrihydrite a common soil mineral, by a variety of mechanisms (e.g., coprecipitation, presorption). Reduction of Fe(III) in ferrihydrite to soluble Fe(II) also occurred, but dissolution of ferrihydrite was not required in order for adsorbed arsenate reduction to be achieved. This was illustrated by bacterial reduction of arsenate coprecipitated with aluminum hydroxide, a mineral that does not undergo reductive dissolution. The rate of arsenate reduction was influenced by the method in which arsenate became associated with the mineral phases and may have been strongly coupled with arsenate desorption rates. The extent of release of arsenite into solution was governed by adsorption of arsenite onto the ferrihydrite or alumina phases. The results of these experiments have interpretive significance to the mobilization of arsenic in large alluvial aquifers, such as those of the Ganges in India and Bangladesh, and in the hyporheic zones of contaminated streams.","language":"English","publisher":"ACS","doi":"10.1021/es001068h","issn":"0013936X","usgsCitation":"Zobrist, J., Dowdle, P., Davis, J., and Oremland, R.S., 2000, Mobilization of arsenite by dissimilatory reduction of adsorbed arsenate: Environmental Science & Technology, v. 34, no. 22, p. 4747-4753, https://doi.org/10.1021/es001068h.","productDescription":"7 p.","startPage":"4747","endPage":"4753","numberOfPages":"7","costCenters":[{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":230751,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"34","issue":"22","noUsgsAuthors":false,"publicationDate":"2000-10-14","publicationStatus":"PW","scienceBaseUri":"505a5b96e4b0c8380cd6f66d","contributors":{"authors":[{"text":"Zobrist, J.","contributorId":34287,"corporation":false,"usgs":true,"family":"Zobrist","given":"J.","email":"","affiliations":[],"preferred":false,"id":393214,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Dowdle, P.R.","contributorId":77678,"corporation":false,"usgs":true,"family":"Dowdle","given":"P.R.","email":"","affiliations":[],"preferred":false,"id":393216,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Davis, J.A.","contributorId":71694,"corporation":false,"usgs":true,"family":"Davis","given":"J.A.","email":"","affiliations":[],"preferred":false,"id":393215,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"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 - Western Branch","active":true,"usgs":true},{"id":37277,"text":"WMA - Earth System Processes Division","active":true,"usgs":true}],"preferred":true,"id":778891,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70022332,"text":"70022332 - 2000 - Geochemical and microbiological methods for evaluating anaerobic processes in an aquifer contaminated by landfill leachate","interactions":[],"lastModifiedDate":"2018-12-10T08:22:49","indexId":"70022332","displayToPublicDate":"2000-01-01T00:00:00","publicationYear":"2000","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":"Geochemical and microbiological methods for evaluating anaerobic processes in an aquifer contaminated by landfill leachate","docAbstract":"Major controls on the retention, distribution, and discharge of surface water in the historic (precanal) Kissimmee drainage basin and river were investigated to determine reference conditions for ecosystem restoration. Precanal Kissimmee drainage-basin hydrology was largely controlled by landforms derived from relict, coastal ridge, lagoon, and shallow-shelf features; widespread carbonate solution depressions; and a poorly developed fluvial drainage network. Prior to channelization for flood control, the Kissimmee River was a very low gradient, moderately meandering river that flowed from Lake Kissimmee to Lake Okeechobee through the lower drainage basin.
We infer that during normal wet seasons, river discharge rapidly exceeded Lake Okeechobee outflow capacity, and excess surface water backed up into the low-gradient Kissimmee River. This backwater effect induced bankfull and peak discharge early in the flood cycle and transformed the flood plain into a shallow aquatic system with both lacustrine and riverine characteristics. The large volumes of surface water retained in the lakes and wetlands of the upper basin maintained overbank flow conditions for several months after peak discharge. Analysis indicates that most of the geomorphic work on the channel and flood plain occurred during the frequently recurring extended periods of overbank discharge and that discharge volume may have been significant in determining channel dimensions.
Comparison of hydrogeomorphic relationships with other river systems identified links between geomorphology and hydrology of the precanal Kissimmee River. However, drainage-basin and hydraulic geometry models derived solely from general populations of river systems may produce spurious reference conditions for restoration design criteria.
","language":"English","publisher":"Geological Society of America","doi":"10.1130/0016-7606(2000)112<884:DGATDR>2.0.CO;2","issn":"00167606","usgsCitation":"Warne, A., Toth, L., and White, W., 2000, Drainage-basis-scale geomorphic analysis to determine refernce conditions for ecologic restoration-Kissimmee River, Florida: Geological Society of America Bulletin, v. 112, no. 6, p. 884-899, https://doi.org/10.1130/0016-7606(2000)112<884:DGATDR>2.0.CO;2.","productDescription":"16 p.","startPage":"884","endPage":"899","costCenters":[],"links":[{"id":230670,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Florida","otherGeospatial":"Kissimmee River, Lake Kissimmee, Lake Okeechobee","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -81.18690490722655,\n 27.800817328100297\n ],\n [\n -81.19102478027344,\n 27.870644599673355\n ],\n [\n -81.20201110839844,\n 27.877321374551116\n ],\n [\n -81.21986389160156,\n 27.93254072134666\n ],\n [\n -81.22055053710938,\n 27.955591004642553\n ],\n [\n -81.29539489746094,\n 28.002283068261377\n ],\n [\n -81.32011413574219,\n 27.99803917062052\n ],\n [\n -81.30569458007812,\n 27.977423576428517\n ],\n [\n -81.34620666503906,\n 27.97499795326776\n ],\n [\n -81.36886596679688,\n 27.97984914504167\n ],\n [\n -81.36817932128906,\n 27.971359416256693\n ],\n [\n -81.34963989257812,\n 27.934967298584915\n ],\n [\n -81.31599426269531,\n 27.921013735392084\n ],\n [\n -81.32148742675781,\n 27.90159708626247\n ],\n [\n -81.31050109863281,\n 27.883390812774888\n ],\n [\n -81.309814453125,\n 27.867609565973098\n ],\n [\n -81.30775451660156,\n 27.859111019382624\n ],\n [\n -81.24938964843749,\n 27.840897604499386\n ],\n [\n -81.24114990234374,\n 27.8421119273228\n ],\n [\n -81.2164306640625,\n 27.81782288866404\n ],\n [\n -81.221923828125,\n 27.79352841586229\n ],\n [\n -81.16561889648438,\n 27.685352198428955\n ],\n [\n -81.17385864257812,\n 27.67379895781762\n ],\n [\n -81.17935180664061,\n 27.581937684694736\n ],\n [\n -81.22673034667969,\n 27.54480631775389\n ],\n [\n -81.21780395507811,\n 27.492435852729894\n ],\n [\n -81.18690490722655,\n 27.421147650741265\n ],\n [\n -81.12648010253906,\n 27.38030375235113\n ],\n [\n -81.05575561523438,\n 27.34554408168226\n ],\n [\n -81.05026245117188,\n 27.31565424126349\n ],\n [\n -81.02210998535156,\n 27.290027966206214\n ],\n [\n -80.98297119140625,\n 27.21433494529935\n ],\n [\n -80.96992492675781,\n 27.178301644674047\n ],\n [\n -80.8978271484375,\n 27.15447663185513\n ],\n [\n -81.02485656738281,\n 27.039556602163195\n ],\n [\n -81.11686706542967,\n 26.974097380304208\n ],\n [\n -81.09832763671875,\n 26.93492599433896\n ],\n [\n -81.03103637695311,\n 26.866343323987433\n ],\n [\n -80.97267150878906,\n 26.882268012500234\n ],\n [\n -80.93971252441406,\n 26.759712731468568\n ],\n [\n -80.82778930664062,\n 26.69163742147271\n ],\n [\n -80.73165893554688,\n 26.676913083105454\n ],\n [\n -80.67741394042969,\n 26.748063090366852\n ],\n [\n -80.6890869140625,\n 26.800170623841804\n ],\n [\n -80.64788818359375,\n 26.83203637945121\n ],\n [\n -80.60531616210938,\n 26.895740996697807\n ],\n [\n -80.60462951660156,\n 26.974097380304208\n ],\n [\n -80.65132141113281,\n 27.088473156555896\n ],\n [\n -80.65475463867188,\n 27.112923428713707\n ],\n [\n -80.73234558105469,\n 27.18685297304107\n ],\n [\n -80.7879638671875,\n 27.216777459372924\n ],\n [\n -80.83946228027344,\n 27.202732272259045\n ],\n [\n -80.96786499023438,\n 27.254629577800063\n ],\n [\n -80.98640441894531,\n 27.37908429955532\n ],\n [\n -81.06124877929688,\n 27.423585614918853\n ],\n [\n -81.10176086425781,\n 27.53993569880378\n ],\n [\n -81.09695434570312,\n 27.647039394312074\n ],\n [\n -81.18690490722655,\n 27.800817328100297\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"112","issue":"6","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a03d3e4b0c8380cd50680","contributors":{"authors":[{"text":"Warne, A.G.","contributorId":97669,"corporation":false,"usgs":true,"family":"Warne","given":"A.G.","email":"","affiliations":[],"preferred":false,"id":392877,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Toth, L.A.","contributorId":55174,"corporation":false,"usgs":true,"family":"Toth","given":"L.A.","email":"","affiliations":[],"preferred":false,"id":392876,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"White, W.A.","contributorId":24489,"corporation":false,"usgs":true,"family":"White","given":"W.A.","email":"","affiliations":[],"preferred":false,"id":392875,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70022257,"text":"70022257 - 2000 - Empirical assessment of fish introductions in a subtropical wetland: An evaluation of contrasting views","interactions":[],"lastModifiedDate":"2012-03-12T17:19:46","indexId":"70022257","displayToPublicDate":"2000-01-01T00:00:00","publicationYear":"2000","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1018,"text":"Biological Invasions","active":true,"publicationSubtype":{"id":10}},"title":"Empirical assessment of fish introductions in a subtropical wetland: An evaluation of contrasting views","docAbstract":"We summarized data from eight quantitative fish surveys conducted in southern Florida to evaluate the distribution and relative abundance of introduced fishes across a variety of habitats. These surveys encompassed marsh and canal habitats throughout most of the Everglades region, including the mangrove fringe of Florida Bay. Two studies provided systematically collected density information over a 20-year period, and documented the first local appearance of four introduced fishes based on their repeated absence in prior surveys. Those species displayed a pattern of rapid population growth followed by decline, then persistence at lower densities. Estuarine areas in the southern Everglades, characterized by natural tidal creeks surrounded by mangrove-dominated marshes, and canals held the largest introduced-fish populations. Introduced fishes were also common, at times exceeding 50% of the fish community, in solution holes that serve as dry-season refuges in short-hydroperiod rockland habitats of the eastern Everglades. Wet prairies and alligator ponds distant from canals generally held few individuals of introduced fishes. These patterns suggest that the introduced fishes in southern Florida at present may not be well-adapted to persist in freshwater marshes of the Everglades, possibly because of an interaction of periodic cold-temperature stress and hydrologic fluctuation. Our analyses indicated low densities of these fishes in central or northern Everglades wet-prairie communities, and, in the absence of experimental data, little evidence of biotic effects in this spatially extensive habitat. There is no guarantee that this condition will be maintained, especially under the cumulative effects of future invasions or environmental change.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Biological Invasions","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1023/A:1011488118444","issn":"13873547","usgsCitation":"Trexler, J., Loftus, W., Jordan, F., Lorenz, J., Chick, J., and Kobza, R.M., 2000, Empirical assessment of fish introductions in a subtropical wetland: An evaluation of contrasting views: Biological Invasions, v. 2, no. 4, p. 265-277, https://doi.org/10.1023/A:1011488118444.","startPage":"265","endPage":"277","numberOfPages":"13","costCenters":[],"links":[{"id":206736,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1023/A:1011488118444"},{"id":230669,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"2","issue":"4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a0904e4b0c8380cd51d74","contributors":{"authors":[{"text":"Trexler, J.C.","contributorId":23108,"corporation":false,"usgs":true,"family":"Trexler","given":"J.C.","email":"","affiliations":[],"preferred":false,"id":392869,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Loftus, W.F.","contributorId":29363,"corporation":false,"usgs":true,"family":"Loftus","given":"W.F.","email":"","affiliations":[],"preferred":false,"id":392870,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Jordan, F.","contributorId":80622,"corporation":false,"usgs":true,"family":"Jordan","given":"F.","affiliations":[],"preferred":false,"id":392872,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Lorenz, J.J.","contributorId":67058,"corporation":false,"usgs":true,"family":"Lorenz","given":"J.J.","email":"","affiliations":[],"preferred":false,"id":392871,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Chick, J.H.","contributorId":93004,"corporation":false,"usgs":true,"family":"Chick","given":"J.H.","affiliations":[],"preferred":false,"id":392873,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Kobza, Robert M.","contributorId":103822,"corporation":false,"usgs":false,"family":"Kobza","given":"Robert","email":"","middleInitial":"M.","affiliations":[{"id":7036,"text":"South Florida Water Management District","active":true,"usgs":false}],"preferred":false,"id":392874,"contributorType":{"id":1,"text":"Authors"},"rank":6}]}} ,{"id":70022230,"text":"70022230 - 2000 - Modeling regional salinization of the Ogallala aquifer, Southern High Plains, TX, USA","interactions":[],"lastModifiedDate":"2012-03-12T17:19:46","indexId":"70022230","displayToPublicDate":"2000-01-01T00:00:00","publicationYear":"2000","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2342,"text":"Journal of Hydrology","active":true,"publicationSubtype":{"id":10}},"title":"Modeling regional salinization of the Ogallala aquifer, Southern High Plains, TX, USA","docAbstract":"Two extensive plumes (combined area > 1000 km2) have been delineated within the Ogallala aquifer in the Southern High Plains, TX, USA. Salinity varies within the plumes spatially and increases with depth; Cl ranges from 50 to >500 mg 1-1. Variable-density flow modeling using SUTRA has identified three broad regions of upward cross-formational flow from the underlying evaporite units. The upward discharge within the modeled plume area is in the range of 10-4-10-5 m3 day-1, and the TDS concentrations are typically >3000 mg 1-1. Regions of increased salinity, identified within the Whitehorse Group (evaporite unit) underlying the Ogallala aquifer, are controlled by the structure and thickness variations relative to the recharge areas. Distinct flow paths, on the order of tens of km to >100 km in length, and varying flow velocities indicate that the salinization of the Ogallala aquifer has been a slow, ongoing process and may represent circulation of waters recharged during Pleistocene or earlier times. On-going pumping has had negligible impact on the salinity distribution in the Ogallala aquifer, although simulations indicate that the velocity distribution in the underlying units may have been affected to depths of 150 m after 30 years of pumping. Because the distribution of saline ground water in this region of the Ogallala aquifer is heterogeneous, careful areal and vertical characterization is warranted prior to any well-field development. (C) 2000 Elsevier Science B.V.Two extensive plumes (combined area >1000 km2) have been delineated within the Ogallala aquifer in the Southern High Plains, TX, USA. Salinity varies within the plumes spatially and increases with depth; Cl ranges from 50 to >500 mg l-1. Variable-density flow modeling using SUTRA has identified three broad regions of upward cross-formational flow from the underlying evaporite units. The upward discharge within the modeled plume area is in the range of 10-4-10-5 m3 day-1, and the TDS concentrations are typically >3000 mg l-1. Regions of increased salinity, identified within the Whitehorse Group (evaporite unit) underlying the Ogallala aquifer, are controlled by the structure and thickness variations relative to the recharge areas. Distinct flow paths, on the order of tens of km to >100 km in length, and varying flow velocities indicate that the salinization of the Ogallala aquifer has been a slow, ongoing process and may represent circulation of waters recharged during Pleistocene or earlier times. On-going pumping has had negligible impact on the salinity distribution in the Ogallala aquifer, although simulations indicate that the velocity distribution in the underlying units may have been affected to depths of 150 m after 30 years of pumping. Because the distribution of saline ground water in this region of the Ogallala aquifer is heterogeneous, careful areal and vertical characterization is warranted prior to any well-field development.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Journal of Hydrology","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","publisher":"Elsevier Science B.V.","publisherLocation":"Amsterdam, Netherlands","doi":"10.1016/S0022-1694(00)00314-0","issn":"00221694","usgsCitation":"Mehta, S., Fryar, A., Brady, R., and Morin, R.H., 2000, Modeling regional salinization of the Ogallala aquifer, Southern High Plains, TX, USA: Journal of Hydrology, v. 238, no. 1-2, p. 44-64, https://doi.org/10.1016/S0022-1694(00)00314-0.","startPage":"44","endPage":"64","numberOfPages":"21","costCenters":[],"links":[{"id":206802,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/S0022-1694(00)00314-0"},{"id":230822,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"238","issue":"1-2","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a5c22e4b0c8380cd6fa71","contributors":{"authors":[{"text":"Mehta, S.","contributorId":74902,"corporation":false,"usgs":true,"family":"Mehta","given":"S.","email":"","affiliations":[],"preferred":false,"id":392778,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Fryar, A.E.","contributorId":59928,"corporation":false,"usgs":true,"family":"Fryar","given":"A.E.","affiliations":[],"preferred":false,"id":392776,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Brady, R.M.","contributorId":70558,"corporation":false,"usgs":true,"family":"Brady","given":"R.M.","email":"","affiliations":[],"preferred":false,"id":392777,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Morin, R. H.","contributorId":31794,"corporation":false,"usgs":true,"family":"Morin","given":"R.","email":"","middleInitial":"H.","affiliations":[],"preferred":false,"id":392775,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70022118,"text":"70022118 - 2000 - The significance of microbial processes in hydrogeology and geochemistry","interactions":[],"lastModifiedDate":"2018-12-07T07:08:17","indexId":"70022118","displayToPublicDate":"2000-01-01T00:00:00","publicationYear":"2000","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1923,"text":"Hydrogeology Journal","active":true,"publicationSubtype":{"id":10}},"title":"The significance of microbial processes in hydrogeology and geochemistry","docAbstract":"Microbial processes affect the chemical composition of groundwater and the hydraulic properties of aquifers in both contaminated and pristine groundwater systems. The patterns of water-chemistry changes that occur depend upon the relative abundance of electron donors and electron acceptors. In many pristine aquifers, where microbial metabolism is limited by the availability of electron donors (usually organic matter), dissolved inorganic carbon (DIC) accumulates slowly along aquifer flow paths and available electron acceptors are consumed sequentially in the order dissolved oxygen > nitrate > Fe(III) > sulfate > CO2 (methanogenesis). In aquifers contaminated by anthropogenic contaminants, an excess of available organic carbon often exists, and microbial metabolism is limited by the availability of electron acceptors. In addition to changes in groundwater chemistry, the solid matrix of the aquifer is affected by microbial processes. The production of carbon dioxide and organic acids can lead to increased mineral solubility, which can lead to the development of secondary porosity and permeability. Conversely, microbial production of carbonate, ferrous iron, and sulfide can result in the precipitation of secondary calcite or pyrite cements that reduce primary porosity and permeability in groundwater systems.","language":"English","publisher":"Springer","doi":"10.1007/PL00010973","issn":"14312174","usgsCitation":"Chapelle, F.H., 2000, The significance of microbial processes in hydrogeology and geochemistry: Hydrogeology Journal, v. 8, no. 1, p. 41-46, https://doi.org/10.1007/PL00010973.","productDescription":"6 p.","startPage":"41","endPage":"46","costCenters":[{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":230442,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"8","issue":"1","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505bb031e4b08c986b324cb5","contributors":{"authors":[{"text":"Chapelle, F. H.","contributorId":101697,"corporation":false,"usgs":true,"family":"Chapelle","given":"F.","email":"","middleInitial":"H.","affiliations":[],"preferred":false,"id":392431,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70022184,"text":"70022184 - 2000 - Habitat conservation and creation: Invoking the flood-pulse concept to enhance fisheries in the lower Mississippi River","interactions":[],"lastModifiedDate":"2012-03-12T17:19:45","indexId":"70022184","displayToPublicDate":"2000-01-01T00:00:00","publicationYear":"2000","noYear":false,"publicationType":{"id":24,"text":"Conference Paper"},"publicationSubtype":{"id":19,"text":"Conference Paper"},"title":"Habitat conservation and creation: Invoking the flood-pulse concept to enhance fisheries in the lower Mississippi River","docAbstract":"Analysis of four years of growth data failed to identify a single temperature or hydrologic variable that consistently accounted for variation in annual growth of catfishes (Ictaluridae). Instead, a composite variable that measured duration of floodplain inundation when water temperature exceeded minima for active feeding was directly related to growth. Results indicated that floodplain inundation have provided little direct energetic benefit to fishes when water temperatures were sub-optimal for active feeding, but floodplain resources were exploited when thermal conditions were sufficient for active feeding and growth. Thus, the flood-pulse concept applies to the lower Mississippi River (LMR) when modified to consider temperature. Managing the existing leveed floodplain to prolong inundation, increase water temperatures during spring flooding, and maintain connectivity of floodplain habitats with the main river channel should benefit fish production in the LMR.","largerWorkTitle":"Polskie Archiwum Hydrobiologii","language":"English","issn":"00323764","usgsCitation":"Schramm, H., Eggleton, M., and Mayo, R., 2000, Habitat conservation and creation: Invoking the flood-pulse concept to enhance fisheries in the lower Mississippi River, in Polskie Archiwum Hydrobiologii, v. 47, no. 1, p. 45-62.","startPage":"45","endPage":"62","numberOfPages":"18","costCenters":[],"links":[{"id":230819,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"47","issue":"1","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a2f05e4b0c8380cd5ca0e","contributors":{"authors":[{"text":"Schramm, H.L. Jr.","contributorId":103823,"corporation":false,"usgs":true,"family":"Schramm","given":"H.L.","suffix":"Jr.","email":"","affiliations":[],"preferred":false,"id":392653,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Eggleton, M.A.","contributorId":40370,"corporation":false,"usgs":true,"family":"Eggleton","given":"M.A.","affiliations":[],"preferred":false,"id":392652,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Mayo, R.M.","contributorId":14972,"corporation":false,"usgs":true,"family":"Mayo","given":"R.M.","email":"","affiliations":[],"preferred":false,"id":392651,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70022179,"text":"70022179 - 2000 - Methyl-mercury degradation pathways: A comparison among three mercury impacted ecosystems","interactions":[],"lastModifiedDate":"2018-12-12T08:59:14","indexId":"70022179","displayToPublicDate":"2000-01-01T00:00:00","publicationYear":"2000","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":"Methyl-mercury degradation pathways: A comparison among three mercury impacted ecosystems","docAbstract":"We examined microbial methylmercury (MeHg) degradation in sediment of the Florida Everglades, Carson River (NV), and San Carlos Creek (CA), three freshwater environments that differ in the extent and type of mercury contamination and sediment biogeochemistry. Degradation rate constant (kdeg) values increased with total mercury (Hgt) contamination both among and within ecosystems. The highest kdeg's (2.8−5.8 d-1) were observed in San Carlos Creek, at acid mine drainage impacted sites immediately downstream of the former New Idria mercury mine, where Hgt ranged from 4.5 to 21.3 ppm (dry wt). A reductive degradation pathway (presumably mer-detoxification) dominated degradation at these sites, as indicated by the nearly exclusive production of 14CH4 from 14C-MeHg, under both aerobic and anaerobic conditions. At the upstream control site, and in the less contaminated ecosystems (e.g. the Everglades), kdeg's were low (≤0.2 d-1) and oxidative demethylation (OD) dominated degradation, as evident from 14CO2production. kdeg increased with microbial CH4 production, organic content, and reduced sulfur in the Carson River system and increased with decreasing pH in San Carlos Creek. OD associated CO2 production increased with pore-water SO42- in Everglades samples but was not attributable to anaerobic methane oxidation, as has been previously proposed. This ecosystem comparison indicates that severely contaminated sediments tend to have microbial populations that actively degrade MeHg via mer-detoxification, whereas OD occurs in heavily contaminated sediments as well but dominates in those less contaminated.
Sulphur 35, a cosmogenically produced radioisotope with a short half‐life (87 days), was measured in snowpack during 1993–1997 and at four locations within the Loch Vale watershed during 1995–1997. The four sites include the two main drainages in the watershed, Andrews Creek and Icy Brook, a small south facing catchment flowing into Andrews Creek (Andrews Spring 1), and a similar north facing catchment flowing out of a scree field into Icy Brook (Spring 19). Concentrations ranged from a high of almost 50 mBq/L for a sample from Spring 19 in June 1996 to a concentration near the detection limit for a sample from Andrews Creek in April 1997. Sulphur 35 concentrations were normalized to sulphate (as mBq/mg SO4−2) and were decay‐corrected to a Julian day of 90 (April 1) for each year. Snowpack had the highest 35S concentration with an average concentration of 53 mBq/mg SO4−2. Concentrations in the streams were much lower, even when corrected for decay relative to JD 90. The large 35S concentrations found in Spring 19 were the result of increases in concentration due to sublimation and/or evapotranspiration and were lower than snowpack when normalized to sulphate. Using 35S concentrations found in snowpack as of JD 90 as a beginning concentration, the fraction of sulphate in streamflow that was derived from atmospheric deposition within the prior water year was estimated. For Icy Brook and Andrews Creek the fraction of the sulphate in streamflow derived from that year's snowpack and precipitation was low prior to the beginning of the main spring melt, reached a maximum during the period of maximum flow, and decreased as the summer progressed. A calculation of the seasonal flux indicated that about 40% of the sulphate that flowed out of the watershed was derived from atmospheric sulphate deposited during the previous year. This suggests that more than half of the sulphate deposited in the watershed by atmospheric processes during the previous year was removed during the following summer. Thus sulphate retention in alpine watersheds like Loch Vale is very limited, and changes in sulphate deposition should be quickly reflected in stream chemistry.
","language":"English","publisher":"American Geophysical Union","doi":"10.1029/1999WR900276","usgsCitation":"Michel, R.L., Campbell, D.H., Clow, D.W., and Turk, J.T., 2000, Timescales for migration of atmospherically derived sulphate through an alpine/subalpine watershed, Loch Vale, Colorado: Water Resources Research, v. 36, no. 1, p. 27-36, https://doi.org/10.1029/1999WR900276.","productDescription":"10 p.","startPage":"27","endPage":"36","costCenters":[{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":479299,"rank":1,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1029/1999wr900276","text":"Publisher Index Page"},{"id":233479,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Colorado","otherGeospatial":"Loch Vale","volume":"36","issue":"1","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505bb3e2e4b08c986b326047","contributors":{"authors":[{"text":"Michel, Robert L. rlmichel@usgs.gov","contributorId":823,"corporation":false,"usgs":true,"family":"Michel","given":"Robert","email":"rlmichel@usgs.gov","middleInitial":"L.","affiliations":[{"id":148,"text":"Branch of Regional Research-Western Region","active":false,"usgs":true}],"preferred":true,"id":396818,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Campbell, Donald H. dhcampbe@usgs.gov","contributorId":1670,"corporation":false,"usgs":true,"family":"Campbell","given":"Donald","email":"dhcampbe@usgs.gov","middleInitial":"H.","affiliations":[],"preferred":true,"id":396817,"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":396820,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Turk, John T.","contributorId":53363,"corporation":false,"usgs":true,"family":"Turk","given":"John","email":"","middleInitial":"T.","affiliations":[],"preferred":false,"id":396819,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70023122,"text":"70023122 - 2000 - Ground-penetrating radar methods used in surface-water discharge measurements","interactions":[],"lastModifiedDate":"2022-12-27T20:26:17.844803","indexId":"70023122","displayToPublicDate":"2000-01-01T00:00:00","publicationYear":"2000","noYear":false,"publicationType":{"id":24,"text":"Conference Paper"},"publicationSubtype":{"id":19,"text":"Conference Paper"},"title":"Ground-penetrating radar methods used in surface-water discharge measurements","docAbstract":"The U.S. Geological Survey (USGS) operates a network of about 7,000 streamflow-gaging stations that monitor open-channel water discharge at locations throughout the United States. The expense, technical difficulties, and concern for the safety of operational personnel under some field conditions have led to the search for alternate measurement methods. Ground- penetrating radar (GPR) has been used by the USGS in hydrologic, geologic, environmental, and bridge-scour studies by floating antennas on water or mounting antennas in boats. GPR methods were developed to measure and monitor remotely the cross-sectional area of rivers by suspending a 100-megahertz (MHz) radar antenna from a cableway car or bridge at four unstable streams that drained the slopes of Mount St. Helens in Washington. Based on the success of these initial efforts, an experiment was conducted in 1999 to see if a combination of complementary radar methods could be used to calculate the discharge of a river without having any of the measuring equipment in the water. The cross-sectional area of the 183- meter (m) wide Skagit River in Washington State was measured using a GPR system with a single 100-MHz antenna suspended 0.5 to 3 m above the water surface from a cableway car. A van- mounted, side-looking pulsed-Doppler (10 gigahertz) radar system was used to collect water-surface velocity data across the same section of the river. The combined radar data sets were used to calculate the river discharge and the results compared closely to the discharge measurement made by using the standard in-water measurement techniques. The depth to the river bottom, which was determined from the GPR data by using a radar velocity of 0.04 meters per nanosecond in water, was about 3 m, which was within 0.25 m of the manually measured values.
","largerWorkTitle":"Proceedings Volume 4084, Eighth International Conference on Ground Penetrating Radar","conferenceTitle":"GPR 2000: The 8th International Conference on Ground Penetrating Radar","conferenceDate":"May 23-26, 2000","conferenceLocation":"Goldcoast, Australia","language":"English","publisher":"Society of Photo-Optical Instrumentation Engineers","publisherLocation":"Bellingham, WA","doi":"10.1117/12.383618","issn":"0277786X","usgsCitation":"Haeni, F., Buursink, M.L., Costa, J.E., Melcher, N.B., Cheng, R.T., and Plant, W.J., 2000, Ground-penetrating radar methods used in surface-water discharge measurements, in Proceedings Volume 4084, Eighth International Conference on Ground Penetrating Radar, v. 4084, Goldcoast, Australia, May 23-26, 2000, p. 494-500, https://doi.org/10.1117/12.383618.","productDescription":"7 p.","startPage":"494","endPage":"500","costCenters":[{"id":493,"text":"Office of Ground Water","active":true,"usgs":true}],"links":[{"id":233371,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Washington","otherGeospatial":"Mount St. Helens","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -122.19033771004008,\n 46.13935248664433\n ],\n [\n -122.18551118264205,\n 46.130035340865675\n ],\n [\n -122.13517739691886,\n 46.14030800221113\n ],\n [\n -122.12586909407966,\n 46.16968201138769\n ],\n [\n -122.12862710973562,\n 46.192119871585334\n ],\n [\n -122.15034648302714,\n 46.22051211430639\n ],\n [\n -122.18206366307197,\n 46.24054486225876\n ],\n [\n -122.23308695270896,\n 46.25055849437294\n ],\n [\n -122.2565300857857,\n 46.224566951055834\n ],\n [\n -122.25928810144163,\n 46.188062638964425\n ],\n [\n -122.24963504664555,\n 46.16633941896265\n ],\n [\n -122.19033771004008,\n 46.13935248664433\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","volume":"4084","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a2b73e4b0c8380cd5b9b7","contributors":{"authors":[{"text":"Haeni, F.P.","contributorId":87105,"corporation":false,"usgs":true,"family":"Haeni","given":"F.P.","affiliations":[],"preferred":false,"id":396387,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Buursink, Marc L. 0000-0001-6491-386X mbuursink@usgs.gov","orcid":"https://orcid.org/0000-0001-6491-386X","contributorId":3362,"corporation":false,"usgs":true,"family":"Buursink","given":"Marc","email":"mbuursink@usgs.gov","middleInitial":"L.","affiliations":[{"id":241,"text":"Eastern Energy Resources Science Center","active":true,"usgs":true}],"preferred":true,"id":396383,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Costa, John E.","contributorId":105743,"corporation":false,"usgs":true,"family":"Costa","given":"John","email":"","middleInitial":"E.","affiliations":[],"preferred":false,"id":396388,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Melcher, Nick B.","contributorId":73587,"corporation":false,"usgs":true,"family":"Melcher","given":"Nick","email":"","middleInitial":"B.","affiliations":[],"preferred":false,"id":396386,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Cheng, Ralph T.","contributorId":69134,"corporation":false,"usgs":true,"family":"Cheng","given":"Ralph","email":"","middleInitial":"T.","affiliations":[],"preferred":false,"id":396385,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Plant, William J.","contributorId":21632,"corporation":false,"usgs":true,"family":"Plant","given":"William","email":"","middleInitial":"J.","affiliations":[],"preferred":false,"id":396384,"contributorType":{"id":1,"text":"Authors"},"rank":6}]}} ,{"id":70023118,"text":"70023118 - 2000 - Aerobic microbial mineralization of dichloroethene as sole carbon substrate","interactions":[],"lastModifiedDate":"2018-12-12T09:51:20","indexId":"70023118","displayToPublicDate":"2000-01-01T00:00:00","publicationYear":"2000","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":"Aerobic microbial mineralization of dichloroethene as sole carbon substrate","docAbstract":"Microorganisms indigenous to the bed sediments of a black- water stream utilized 1,2-dichloroethene (1,2-DCE) as a sole carbon substrate for aerobic metabolism. Although no evidence of growth was observed in the minimal salts culture media used in this study, efficient aerobic microbial mineralization of 1,2-DCE as sole carbon substrate was maintained through three sequential transfers (107 final dilution) of the original environmental innoculum. These results indicate that 1,2-DCE can be utilized as a primary substrate to support microbial metabolism under aerobic conditions.Microorganisms indigenous to the bed sediments of a black-water stream utilized 1,2-dichloroethene (1,2-DCE) as a sole carbon substrate for aerobic metabolism. Although no evidence of growth was observed in the minimal salts culture media used in this study, efficient aerobic microbial mineralization of 1,2-DCE as sole carbon substrate was maintained through three sequential transfers (107 final dilution) of the original environmental innoculum. These results indicate that 1,2-DCE can be utilized as a primary substrate to support microbial metabolism under aerobic conditions.","language":"English","publisher":"ACS","doi":"10.1021/es990785c","issn":"0013936X","usgsCitation":"Bradley, P., and Chapelle, F.H., 2000, Aerobic microbial mineralization of dichloroethene as sole carbon substrate: Environmental Science & Technology, v. 34, no. 1, p. 221-223, https://doi.org/10.1021/es990785c.","productDescription":"3 p.","startPage":"221","endPage":"223","costCenters":[{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":233845,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":208237,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1021/es990785c"}],"volume":"34","issue":"1","noUsgsAuthors":false,"publicationDate":"1999-11-24","publicationStatus":"PW","scienceBaseUri":"5059e71fe4b0c8380cd4786d","contributors":{"authors":[{"text":"Bradley, P. M. 0000-0001-7522-8606","orcid":"https://orcid.org/0000-0001-7522-8606","contributorId":29465,"corporation":false,"usgs":true,"family":"Bradley","given":"P. M.","affiliations":[],"preferred":false,"id":396225,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Chapelle, F. H.","contributorId":101697,"corporation":false,"usgs":true,"family":"Chapelle","given":"F.","email":"","middleInitial":"H.","affiliations":[],"preferred":false,"id":396226,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70023106,"text":"70023106 - 2000 - Shallow subsurface storm flow in a forested headwater catchment: Observations and modeling using a modified TOPMODEL","interactions":[],"lastModifiedDate":"2018-03-21T14:17:03","indexId":"70023106","displayToPublicDate":"2000-01-01T00:00:00","publicationYear":"2000","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3722,"text":"Water Resources Research","onlineIssn":"1944-7973","printIssn":"0043-1397","active":true,"publicationSubtype":{"id":10}},"title":"Shallow subsurface storm flow in a forested headwater catchment: Observations and modeling using a modified TOPMODEL","docAbstract":"Transient, perched water tables in the shallow subsurface are observed at the South Fork Brokenback Run catchment in Shenandoah National Park, Virginia. Crest piezometers installed along a hillslope transect show that the development of saturated conditions in the upper 1.5 m of the subsurface is controlled by total precipitation and antecedent conditions, not precipitation intensity, although soil heterogeneities strongly influence local response. The macroporous subsurface storm flow zone provides a hydrological pathway for rapid runoff generation apart from the underlying groundwater zone, a conceptualization supported by the two‐storage system exhibited by hydrograph recession analysis. A modified version of TOPMODEL is used to simulate the observed catchment dynamics. In this model, generalized topographic index theory is applied to the subsurface storm flow zone to account for logarithmic storm flow recessions, indicative of linearly decreasing transmissivity with depth. Vertical drainage to the groundwater zone is required, and both subsurface reservoirs are considered to contribute to surface saturation.
","language":"English","publisher":"American Geophysical Union","doi":"10.1029/2000WR900125","usgsCitation":"Scanlon, T.M., Raffensperger, J., Hornberger, G., and Clapp, R.B., 2000, Shallow subsurface storm flow in a forested headwater catchment: Observations and modeling using a modified TOPMODEL: Water Resources Research, v. 36, no. 9, p. 2575-2586, https://doi.org/10.1029/2000WR900125.","productDescription":"12 p.","startPage":"2575","endPage":"2586","costCenters":[],"links":[{"id":233663,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"36","issue":"9","noUsgsAuthors":false,"publicationDate":"2010-07-09","publicationStatus":"PW","scienceBaseUri":"505b8e40e4b08c986b31880b","contributors":{"authors":[{"text":"Scanlon, Todd M.","contributorId":178235,"corporation":false,"usgs":false,"family":"Scanlon","given":"Todd","email":"","middleInitial":"M.","affiliations":[{"id":25492,"text":"University of Virginia","active":true,"usgs":false}],"preferred":false,"id":396190,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Raffensperger, Jeff P. 0000-0001-9275-6646 jpraffen@usgs.gov","orcid":"https://orcid.org/0000-0001-9275-6646","contributorId":140239,"corporation":false,"usgs":true,"family":"Raffensperger","given":"Jeff P.","email":"jpraffen@usgs.gov","affiliations":[{"id":41514,"text":"Maryland-Delaware-District of Columbia Water Science Center","active":true,"usgs":true}],"preferred":false,"id":396191,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Hornberger, George M.","contributorId":63894,"corporation":false,"usgs":true,"family":"Hornberger","given":"George M.","affiliations":[],"preferred":false,"id":396189,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Clapp, Roger B.","contributorId":12904,"corporation":false,"usgs":true,"family":"Clapp","given":"Roger","email":"","middleInitial":"B.","affiliations":[],"preferred":false,"id":396188,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70185676,"text":"70185676 - 2000 - Geochemical investigations by the U.S. Geological Survey on uranium mining, milling, and environmental restoration","interactions":[],"lastModifiedDate":"2019-02-25T11:27:13","indexId":"70185676","displayToPublicDate":"2000-01-01T00:00:00","publicationYear":"2000","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":5338,"text":"Technology","active":true,"publicationSubtype":{"id":10}},"title":"Geochemical investigations by the U.S. Geological Survey on uranium mining, milling, and environmental restoration","docAbstract":"Recent research by the U.S. Geological Survey has characterized contaminant sources and identified important geochemical processes that influence transport of radionuclides from uranium mining and milling wastes. 1) Selective extraction studies indicated that alkaline earth sulfates and hydrous ferric oxides are important hosts of 226Ra in uranium mill tailings. The action of sulfate-reducing and ironreducing bacteria on these phases was shown to enhance release of radium, and this adverse result may temper decisions to dispose of uranium mill tailings in anaerobic environments. 2) Field studies have shown that although surface-applied sewage sludge/wood chip amendments aid in revegetating pyritic spoil, the nitrogen in sludge leachate can enhance pyrite oxidation, acidification of groundwater, and the consequent mobilization of metals and radionuclides. 3) In a U.S. Environmental Protection Agencyfunded study, three permeable reactive barriers consisting of phosphate-rich material, zero-valent iron, or amorphous ferric oxyhydroxide have been installed at an abandoned uranium upgrader facility near Fry Canyon, UT. Preliminary results indicate that each of the permeable reactive barriers is removing the majority of the uranium from the groundwater. 4) Studies on the geochemistry of rare earth elements as analogues for actinides such as uranium and thorium in acid mine drainage environments indicate high mobility under acid-weathering conditions but measurable attenuation associated with iron and aluminum colloid formation. Mass balances from field and laboratory studies are being used to quantify the amount of attenuation. 5) A field study in Colorado demonstrated the use of 234U/238U isotopic ratio measurements to evaluate contamination of shallow groundwater with uranium mill effluent.
","language":"English","publisher":"Springer","doi":"10.1007/BF00776028","usgsCitation":"Landa, E.R., Cravotta, C., Naftz, D.L., Verplanck, P.L., Nordstrom, D.K., and Zielinski, R.A., 2000, Geochemical investigations by the U.S. Geological Survey on uranium mining, milling, and environmental restoration: Technology, v. 7, no. 2-4, p. 381-396, https://doi.org/10.1007/BF00776028.","productDescription":"16 p. ","startPage":"381","endPage":"396","costCenters":[{"id":532,"text":"Pennsylvania Water Science Center","active":true,"usgs":true},{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":338390,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Utah","otherGeospatial":"Fry Canyon","volume":"7","issue":"2-4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"58da253ae4b0543bf7fda859","contributors":{"authors":[{"text":"Landa, Edward R. erlanda@usgs.gov","contributorId":2112,"corporation":false,"usgs":true,"family":"Landa","given":"Edward","email":"erlanda@usgs.gov","middleInitial":"R.","affiliations":[],"preferred":true,"id":686340,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Cravotta, Charles A. 0000-0003-3116-4684 cravotta@usgs.gov","orcid":"https://orcid.org/0000-0003-3116-4684","contributorId":178696,"corporation":false,"usgs":true,"family":"Cravotta","given":"Charles A. ","email":"cravotta@usgs.gov","affiliations":[{"id":532,"text":"Pennsylvania Water Science Center","active":true,"usgs":true}],"preferred":false,"id":686341,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Naftz, David L. 0000-0003-1130-6892 dlnaftz@usgs.gov","orcid":"https://orcid.org/0000-0003-1130-6892","contributorId":1041,"corporation":false,"usgs":true,"family":"Naftz","given":"David","email":"dlnaftz@usgs.gov","middleInitial":"L.","affiliations":[{"id":5050,"text":"WY-MT Water Science Center","active":true,"usgs":true},{"id":610,"text":"Utah Water Science Center","active":true,"usgs":true}],"preferred":true,"id":686342,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Verplanck, Philip L. 0000-0002-3653-6419 plv@usgs.gov","orcid":"https://orcid.org/0000-0002-3653-6419","contributorId":728,"corporation":false,"usgs":true,"family":"Verplanck","given":"Philip","email":"plv@usgs.gov","middleInitial":"L.","affiliations":[{"id":171,"text":"Central Mineral and Environmental Resources Science Center","active":true,"usgs":true}],"preferred":true,"id":686343,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Nordstrom, D. Kirk 0000-0003-3283-5136 dkn@usgs.gov","orcid":"https://orcid.org/0000-0003-3283-5136","contributorId":749,"corporation":false,"usgs":true,"family":"Nordstrom","given":"D.","email":"dkn@usgs.gov","middleInitial":"Kirk","affiliations":[{"id":5044,"text":"National Research Program - Central Branch","active":true,"usgs":true},{"id":37277,"text":"WMA - Earth System Processes Division","active":true,"usgs":true}],"preferred":false,"id":686344,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Zielinski, Robert A. 0000-0002-4047-5129 rzielinski@usgs.gov","orcid":"https://orcid.org/0000-0002-4047-5129","contributorId":1593,"corporation":false,"usgs":true,"family":"Zielinski","given":"Robert","email":"rzielinski@usgs.gov","middleInitial":"A.","affiliations":[{"id":164,"text":"Central Energy Resources Science Center","active":true,"usgs":true}],"preferred":true,"id":686345,"contributorType":{"id":1,"text":"Authors"},"rank":6}]}} ,{"id":70185677,"text":"70185677 - 2000 - Approaches to modelling uranium (VI) adsorption on natural mineral assemblages","interactions":[],"lastModifiedDate":"2018-12-14T11:45:26","indexId":"70185677","displayToPublicDate":"2000-01-01T00:00:00","publicationYear":"2000","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3226,"text":"Radiochimica Acta","active":true,"publicationSubtype":{"id":10}},"title":"Approaches to modelling uranium (VI) adsorption on natural mineral assemblages","docAbstract":"Component additivity (CA) and generalised composite (GC) approaches to deriving a suitable surface complexation model for description of U(VI) adsorption to natural mineral assemblages are pursued in this paper with good success. A single, ferrihydrite-like component is found to reasonably describe uranyl uptake to a number of kaolinitic iron-rich natural substrates at pH > 4 in the CA approach with previously published information on nature of surface complexes, acid-base properties of surface sites and electrostatic effects used in the model. The GC approach, in which little pre-knowledge about generic surface sites is assumed, gives even better fits and would appear to be a method of particular strength for application in areas such as performance assessment provided the model is developed in a careful, stepwise manner with simplicity and goodness of fit as the major criteria for acceptance.
","language":"English","publisher":"International Atomic Energy Agency ","doi":"10.1524/ract.2000.88.9-11.687","usgsCitation":"Waite, T., Davis, J., Fenton, B., and Payne, T., 2000, Approaches to modelling uranium (VI) adsorption on natural mineral assemblages: Radiochimica Acta, v. 88, p. 687-696, https://doi.org/10.1524/ract.2000.88.9-11.687.","productDescription":"10 p. ","startPage":"687","endPage":"696","costCenters":[{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":338395,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"88","noUsgsAuthors":false,"publicationDate":"2009-09-25","publicationStatus":"PW","scienceBaseUri":"58da253ae4b0543bf7fda857","contributors":{"authors":[{"text":"Waite, T.D.","contributorId":31116,"corporation":false,"usgs":true,"family":"Waite","given":"T.D.","email":"","affiliations":[],"preferred":false,"id":686350,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Davis, J.A.","contributorId":71694,"corporation":false,"usgs":true,"family":"Davis","given":"J.A.","email":"","affiliations":[],"preferred":false,"id":686351,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Fenton, B.R.","contributorId":189879,"corporation":false,"usgs":false,"family":"Fenton","given":"B.R.","email":"","affiliations":[],"preferred":false,"id":686352,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Payne, T.E.","contributorId":31916,"corporation":false,"usgs":true,"family":"Payne","given":"T.E.","email":"","affiliations":[],"preferred":false,"id":686353,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70185232,"text":"70185232 - 2000 - Multivariate correlation between concentrations of selected herbicides and derivatives in outflows from selected U.S. midwestern reservoirs","interactions":[],"lastModifiedDate":"2018-12-12T10:55:24","indexId":"70185232","displayToPublicDate":"2000-01-01T00:00:00","publicationYear":"2000","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":"Multivariate correlation between concentrations of selected herbicides and derivatives in outflows from selected U.S. midwestern reservoirs","docAbstract":"Multivariate correlations between the concentrations of selected herbicides and herbicide derivatives in outflows from selected reservoirs in the Midwestern United States for April 1992 through September 1993 were investigated using principal component analysis (PCA) and multivariate curve resolution (MCR). Two independent sources for alachlor ethanesulfonic acid, one major source related to spring flush and seasonal runoff and another minor source related to groundwater, were identified using PCA. Results of MCR provided a semiquantitative interpretation of the environmental sources of the observed herbicide concentrations in reservoir outflows and allowed the examination of their temporal and geographical distributions. Samples with higher herbicide concentrations were collected from reservoirs in Indiana and Ohio, especially during the late spring and summer.
","language":"English","publisher":"American Chemical Society","doi":"10.1021/es000884m","usgsCitation":"Tauler, R., Barcelo, D., and Thurman, E., 2000, Multivariate correlation between concentrations of selected herbicides and derivatives in outflows from selected U.S. midwestern reservoirs: Environmental Science & Technology, v. 34, no. 16, p. 3307-3314, https://doi.org/10.1021/es000884m.","productDescription":"8 p. ","startPage":"3307","endPage":"3314","costCenters":[{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":337752,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"34","issue":"16","noUsgsAuthors":false,"publicationDate":"2000-07-08","publicationStatus":"PW","scienceBaseUri":"58cba422e4b0849ce97dc792","contributors":{"authors":[{"text":"Tauler, R.","contributorId":189430,"corporation":false,"usgs":false,"family":"Tauler","given":"R.","email":"","affiliations":[],"preferred":false,"id":684815,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Barcelo, D.","contributorId":24107,"corporation":false,"usgs":true,"family":"Barcelo","given":"D.","affiliations":[],"preferred":false,"id":684816,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Thurman, E.M.","contributorId":102864,"corporation":false,"usgs":true,"family":"Thurman","given":"E.M.","affiliations":[],"preferred":false,"id":684817,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70180284,"text":"70180284 - 2000 - USGS investigations of rural Arizona watersheds; hydrogeology of the Coconino Plateau; background and current status","interactions":[],"lastModifiedDate":"2017-01-26T14:26:40","indexId":"70180284","displayToPublicDate":"2000-01-01T00:00:00","publicationYear":"2000","noYear":false,"publicationType":{"id":24,"text":"Conference Paper"},"publicationSubtype":{"id":19,"text":"Conference Paper"},"title":"USGS investigations of rural Arizona watersheds; hydrogeology of the Coconino Plateau; background and current status","docAbstract":"No abstract available.
","largerWorkType":{"id":24,"text":"Conference Paper"},"largerWorkTitle":"First Coconino Plateau hydrology workshop","largerWorkSubtype":{"id":19,"text":"Conference Paper"},"conferenceTitle":"First Coconino Plateau hydrology workshop","language":"English","usgsCitation":"Bills, D., Flynn, M., and Woodhouse, B., 2000, USGS investigations of rural Arizona watersheds; hydrogeology of the Coconino Plateau; background and current status, in First Coconino Plateau hydrology workshop, p. 23-27.","productDescription":"5 p.","startPage":"23","endPage":"27","costCenters":[],"links":[{"id":334083,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"588b1978e4b0ad67323f97fa","contributors":{"authors":[{"text":"Bills, Donald J. djbills@usgs.gov","contributorId":4180,"corporation":false,"usgs":true,"family":"Bills","given":"Donald J.","email":"djbills@usgs.gov","affiliations":[{"id":128,"text":"Arizona Water Science Center","active":true,"usgs":true}],"preferred":false,"id":661071,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Flynn, M.E.","contributorId":67993,"corporation":false,"usgs":true,"family":"Flynn","given":"M.E.","email":"","affiliations":[],"preferred":false,"id":661072,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Woodhouse, Betsy","contributorId":92327,"corporation":false,"usgs":true,"family":"Woodhouse","given":"Betsy","email":"","affiliations":[],"preferred":false,"id":661073,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ]}