In the past, ice-core records from mid-latitude glaciers in alpine areas of the continental United States were considered to be poor candidates for paleoclimate records because of the influence of meltwater on isotopic stratigraphy. To evaluate the existence of reliable paleoclimatic records, a 160-m ice core, containing about 250 yr of record was obtained from Upper Fremont Glacier, at an altitude of 4000 m in the Wind River Range of south-central North America. The δ18O (SMOW) profile from the core shows a -0.95‰ shift to lighter values in the interval from 101.8 to 150 m below the surface, corresponding to the latter part of the Little Ice Age (LIA). Numerous high-amplitude oscillations in the section of the core from 101.8 to 150 m cannot be explained by site-specific lateral variability and probably reflect increased seasonality or better preservation of annual signals as a result of prolonged cooler temperatures that existed in this alpine setting. An abrupt decrease in these large amplitude oscillations at the 101.8-m depth suggests a sudden termination of this period of lower temperatures which generally coincides with the termination of the LIA. Three common features in the δ18O profiles between Upper Fremont Glacier and the better dated Quelccaya Ice Cap cores indicate a global paleoclimate linkage, further supporting the first documented occurrence of the LIA in an ice-core record from a temperate glacier in south-central North America.
","language":"English","publisher":"INSTAAR, University of Colorado","doi":"10.2307/1552083","issn":"00040851","usgsCitation":"Naftz, D.L., Klusman, R., Michel, R.L., Schuster, P., Ready, M., Taylor, H.E., Yanosky, T., and McConnaughey, E., 1996, Little Ice Age evidence from a south-central North American ice core, U.S.A.: Arctic and Alpine Research, v. 28, no. 1, p. 35-41, https://doi.org/10.2307/1552083.","productDescription":"7 p.","startPage":"35","endPage":"41","costCenters":[{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":227402,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","otherGeospatial":"Upper Fremont Glacier, Wind River Range","volume":"28","issue":"1","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a48b1e4b0c8380cd68066","contributors":{"authors":[{"text":"Naftz, D. L.","contributorId":40624,"corporation":false,"usgs":true,"family":"Naftz","given":"D.","email":"","middleInitial":"L.","affiliations":[],"preferred":false,"id":380734,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Klusman, R.W.","contributorId":93108,"corporation":false,"usgs":true,"family":"Klusman","given":"R.W.","email":"","affiliations":[],"preferred":false,"id":380738,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Michel, R. L.","contributorId":86375,"corporation":false,"usgs":true,"family":"Michel","given":"R.","email":"","middleInitial":"L.","affiliations":[],"preferred":false,"id":380737,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Schuster, P. F.","contributorId":30197,"corporation":false,"usgs":true,"family":"Schuster","given":"P. F.","affiliations":[],"preferred":false,"id":380732,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Ready, M.M.","contributorId":63968,"corporation":false,"usgs":true,"family":"Ready","given":"M.M.","email":"","affiliations":[],"preferred":false,"id":380736,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Taylor, Howard E. hetaylor@usgs.gov","contributorId":1551,"corporation":false,"usgs":true,"family":"Taylor","given":"Howard","email":"hetaylor@usgs.gov","middleInitial":"E.","affiliations":[{"id":5044,"text":"National Research Program - Central Branch","active":true,"usgs":true}],"preferred":true,"id":380733,"contributorType":{"id":1,"text":"Authors"},"rank":6},{"text":"Yanosky, T.M.","contributorId":42263,"corporation":false,"usgs":true,"family":"Yanosky","given":"T.M.","email":"","affiliations":[],"preferred":false,"id":380735,"contributorType":{"id":1,"text":"Authors"},"rank":7},{"text":"McConnaughey, E.A.","contributorId":97265,"corporation":false,"usgs":true,"family":"McConnaughey","given":"E.A.","email":"","affiliations":[],"preferred":false,"id":380739,"contributorType":{"id":1,"text":"Authors"},"rank":8}]}} ,{"id":70018636,"text":"70018636 - 1996 - Hydrogeologic controls on the groundwater interactions with an acidic lake in karst terrain, Lake Barco, Florida","interactions":[],"lastModifiedDate":"2018-03-08T15:27:42","indexId":"70018636","displayToPublicDate":"1996-01-01T00:00:00","publicationYear":"1996","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":"Hydrogeologic controls on the groundwater interactions with an acidic lake in karst terrain, Lake Barco, Florida","docAbstract":"Transient groundwater interactions and lake stage were simulated for Lake Barco, an acidic seepage lake in the mantled karst of north central Florida. Karst subsidence features affected groundwater flow patterns in the basin and groundwater fluxes to and from the lake. Subsidence features peripheral to the lake intercepted potential groundwater inflow and increased leakage from the shallow perimeter of the lake bed. Simulated groundwater fluxes were checked against net groundwater flow derived from a detailed lake hydrologic budget with short-term lake evaporation computed by the energy budget method. Discrepancies between modeled and budget-derived net groundwater flows indicated that the model underestimated groundwater inflow, possibly contributed to by transient water table mounding near the lake. Recharge from rainfall reduced lake leakage by 10 to 15 times more than it increased groundwater inflow. As a result of the karst setting, the contributing groundwater basin to the lake was 2.4 ha for simulated average rainfall conditions, compared to the topographically derived drainage basin area of 81 ha. Short groundwater inflow path lines and rapid travel times limit the contribution of acid-neutralizing solutes from the basin, making Lake Barco susceptible to increased acidification by acid rain.
","language":"English","publisher":"American Geophysical Union","doi":"10.1029/96WR00162","usgsCitation":"Lee, T.M., 1996, Hydrogeologic controls on the groundwater interactions with an acidic lake in karst terrain, Lake Barco, Florida: Water Resources Research, v. 32, no. 4, p. 831-844, https://doi.org/10.1029/96WR00162.","productDescription":"14 p.","startPage":"831","endPage":"844","costCenters":[],"links":[{"id":227309,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"32","issue":"4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a33a4e4b0c8380cd5f148","contributors":{"authors":[{"text":"Lee, T. M.","contributorId":67855,"corporation":false,"usgs":true,"family":"Lee","given":"T.","email":"","middleInitial":"M.","affiliations":[],"preferred":false,"id":380286,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70018634,"text":"70018634 - 1996 - Cadmium in the California Current system: Tracer of past and present upwelling","interactions":[],"lastModifiedDate":"2019-02-14T07:34:50","indexId":"70018634","displayToPublicDate":"1996-01-01T00:00:00","publicationYear":"1996","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2315,"text":"Journal of Geophysical Research C: Oceans","active":true,"publicationSubtype":{"id":10}},"title":"Cadmium in the California Current system: Tracer of past and present upwelling","docAbstract":"Over 100 samples were collected off the west coast of North America during 1991–1993 to determine the relation between wind‐driven upwelling and nearshore concentrations of dissolved silicate (Si), phosphate (P), and cadmium (Cd). Highly enriched in deep water offshore, these constituents are sensitive indicators of upwelling. Coastal water was sampled from the shore in January and June 1992 at 12 sites distributed between 36° and 48°N latitude. In January the composition of nearshore water along this transect was fairly uniform: 5–15 μmol/kg for Si, 0.5 to 1.0 μmol/kg for P, and 0.1–0.3 nmol/kg for Cd. In June, elevated concentrations of Si (30 μmol/kg), P (2.0 μmol/kg), and Cd (0.6 nmol/kg) revealed a region of intense upwelling between 38° and 40°N. The pattern is broadly consistent with meridional gradients in coastal upwelling calculated from the long‐term mean of alongshore winds compiled from ship reports. Nearshore water was also collected biweekly to monthly at two sites 3 km apart near San Francisco Bay (37.5°N) during 1991–1993. The variability seen in the time series suggests that the composition of nearshore water integrates the effect of alongshore winds over timescales of several weeks. Seasonal variations in Si (5–50 μmol/kg), P (0.5–2.5 μmol/kg), and Cd (0.1–0.8 nmol/kg) concentrations were consistent with upwelling during spring and summer. Maximum Si, P, and Cd concentrations reached in May 1991 were consistent with advection to the very nearshore region from a depth of about 300 m relative to a vertical profile at a distance of 200 km from the coast. Nearshore Si, P, and Cd concentrations were reduced relative to 1991 in 1992, and, to a lesser extent, in 1993 due to weaker upwelling linked to the warm phase of the El Niño‐Southern Oscillation. During periods of weaker upwelling or downwelling, variations in P, Si, and Cd concentrations became uncoupled. There is a good correlation between the coastal Cd time series near San Francisco Bay (37.5°N) and a second order polynomial function of the upwelling index of Bakun [1975] at 36°N, filtered with a 30‐day running mean (r2 = 0.71, n = 39). The index is a daily estimate of coastal upwelling calculated from 6‐hourly mean atmospheric pressure distributions at 36°N. From this function and a record of daily upwelling indices, we infer a range of annually averaged coastal Cd concentrations of at least 0.3–0.5 nmol/kg since 1967. Cd/Ca ratios in shells of foraminifera from San Francisco Bay suggest that average coastal Cd concentrations 3500–4500 years ago were at the upper end of this range.
The occurrence and distribution of selected pesticides and their metabolites were investigated through the collection of 837 water-quality samples from 303 wells across the Midwest. Results of this study showed that five of the six most frequently detected compounds were pesticide metabolites. Thus, it was common for a metabolite to be found more frequently in groundwater than its parent compound. The metabolite alachlor ethanesulfonic acid (alachlor-ESA; 2-[(2,6-diethylphenyl)(methoxymethyl)amino]-2-oxoethanesulfonic acid) was detected almost 10 times as frequently and at much higher concentrations than its parent compound alachlor (2-chloro-2‘,6‘-diethyl-N-(methoxymethyl)acetamide). The median detectable atrazine (2-chloro-4-ethylamino-6- isopropylamino-s-triazine) concentration was almost half that of atrazine residue (atrazine plus the two atrazine metabolites analyzed). Cyanazine amide [2-chloro-4-(1-carbamoyl-1-methylethylamino)-6-ethylamino-s-triazine] was detected almost twice as frequently as cyanazine (2-chloro-4-ethylamino-6-methylpropionitrileamino-s-triazine). Results show that information on pesticide metabolites is necessary to understand the environmental fate of pesticides. Consequently, if pesticide metabolites are not quantified, the effects of chemical use on groundwater quality would be substantially underestimated. Thus, continued research is needed to identify major degradation pathways for all pesticides and to develop analytical methods to determine their concentrations in water and other environmental media.
","language":"English","publisher":"American Chemical Society","doi":"10.1021/es950462q","issn":"0013936X","usgsCitation":"Kolpin, D., Michael, T.E., and Goolsby, D.A., 1996, Occurrence of selected pesticides and their metabolites in near-surface aquifers of the midwestern United States: Environmental Science & Technology, v. 30, no. 1, p. 335-340, https://doi.org/10.1021/es950462q.","productDescription":"6 p.","startPage":"335","endPage":"340","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[{"id":351,"text":"Iowa Water Science Center","active":true,"usgs":true},{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":226662,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":205767,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1021/es950462q"}],"country":"United States","geographicExtents":"{ \"type\": \"FeatureCollection\", 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D.W.","contributorId":87565,"corporation":false,"usgs":true,"family":"Kolpin","given":"D.W.","email":"","affiliations":[],"preferred":false,"id":380889,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Michael, Thurman E.","contributorId":86116,"corporation":false,"usgs":true,"family":"Michael","given":"Thurman","email":"","middleInitial":"E.","affiliations":[],"preferred":false,"id":380888,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Goolsby, D. A.","contributorId":50508,"corporation":false,"usgs":true,"family":"Goolsby","given":"D.","email":"","middleInitial":"A.","affiliations":[],"preferred":false,"id":380887,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70018629,"text":"70018629 - 1996 - Mapping playa evaporite minerals and associated sediments in Death Valley, California, with multispectral thermal infrared images","interactions":[],"lastModifiedDate":"2024-11-12T17:41:33.097721","indexId":"70018629","displayToPublicDate":"1996-01-01T00:00:00","publicationYear":"1996","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2314,"text":"Journal of Geophysical Research B: Solid Earth","active":true,"publicationSubtype":{"id":10}},"title":"Mapping playa evaporite minerals and associated sediments in Death Valley, California, with multispectral thermal infrared images","docAbstract":"Efflorescent salt crusts and associated sediments in Death Valley, California, were studied with remote-sensing data acquired by the NASA thermal infrared multispectral scanner (TIMS). Nine spectral classes that represent a variety of surface materials were distinguished, including several classes that reflect important aspects of the playa groundwater chemistry and hydrology. Evaporite crusts containing abundant thenardite (sodium sulfate) were mapped along the northern and eastern margins of the Cottonball Basin, areas where the inflow waters are rich in sodium. Gypsum (calcium sulfate) crusts were more common in the Badwater Basin, particularly near springs associated with calcic groundwaters along the western basin margin. Evaporite-rich crusts generally marked areas where groundwater is periodically near the surface and thus able to replenish the crusts though capillary evaporation. Detrital silicate minerals were prevalent in other parts of the salt pan where shallow groundwater does not affect the surface composition. The surface features in Death Valley change in response to climatic variations on several different timescales. For example, salt crusts on low-lying mudflats form and redissolve during seasonal-to-interannual cycles of wetting and desiccation. In contrast, recent flooding and erosion of rough-salt surfaces in Death Valley probably reflect increased regional precipitation spanning several decades. Remote-sensing observations of playas can provide a means for monitoring changes in evaporite facies and for better understanding the associated climatic processes. At present, such studies are limited by the availability of suitable airborne scanner data. However, with the launch of the Earth Observing System (EOS) AM-1 Platform in 1998, multispectral visible/near-infrared and thermal infrared remote-sensing data will become globally available.
","language":"English","publisher":"American Geophysical Union","doi":"10.1029/95JB02813","issn":"01480227","usgsCitation":"Crowley, J., and Hook, S., 1996, Mapping playa evaporite minerals and associated sediments in Death Valley, California, with multispectral thermal infrared images: Journal of Geophysical Research B: Solid Earth, v. 101, no. B1, p. 643-660, https://doi.org/10.1029/95JB02813.","productDescription":"18 p.","startPage":"643","endPage":"660","numberOfPages":"18","costCenters":[],"links":[{"id":227220,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"101","issue":"B1","noUsgsAuthors":false,"publicationDate":"1996-01-10","publicationStatus":"PW","scienceBaseUri":"505a506fe4b0c8380cd6b6bb","contributors":{"authors":[{"text":"Crowley, J.K.","contributorId":103690,"corporation":false,"usgs":true,"family":"Crowley","given":"J.K.","email":"","affiliations":[],"preferred":false,"id":380271,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Hook, S.J.","contributorId":21711,"corporation":false,"usgs":true,"family":"Hook","given":"S.J.","email":"","affiliations":[],"preferred":false,"id":380270,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70018615,"text":"70018615 - 1996 - Shallow subsurface geology of part of the Savannah River alluvial valley in the upper Coastal Plain of Georgia and South Carolina","interactions":[],"lastModifiedDate":"2012-03-12T17:19:15","indexId":"70018615","displayToPublicDate":"1996-01-01T00:00:00","publicationYear":"1996","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3443,"text":"Southeastern Geology","active":true,"publicationSubtype":{"id":10}},"title":"Shallow subsurface geology of part of the Savannah River alluvial valley in the upper Coastal Plain of Georgia and South Carolina","docAbstract":"The depth to which Coastal Plain rivers incise underlying formations is an important control on local and regional hydrologic flow systems. In order to clarify these stream/aquifer relations, a better understanding of the shallow subsurface geology of the Savannah River was necessary. To accomplish this, three drillhole transects were completed across a part of the Savannah River alluvial valley in September 1993, and five geologic sections were constructed from the data. The alluvium is coarser, more angular, and more poorly sorted than the underlying formations, and lithologic differences between the strata are readily apparent, especially in areas where the underlying strata are of marine origin. Inspection of the transects indicates an asymmetry to both the alluvial terrace complex and the underlying bedrock strath. The alluvium thins in a coastward direction; and similarly, bulk-grain size diminishes in a downstream direction. This phenomenon has remained constant over time and is most likely a function of the change in slope which occurs when the river traverses the Fall Line north of the study area. The maximum thickness of the alluvial valley fill is 50 ft. The elevation of the unconformity between the alluvium and the underlying formation is far below the lowest elevation of the modern-day thalweg, indicating that the alluvial system has aggraded to form the modern-day Savannah River Valley. Formerly, the Savannah River was located immediately adjacent to and east of the modern floodplain when the river valley was formed by a cyclic pattern of infilling and subsequent entrenchment that gave rise to an irregular bedrock surface beneath the depositional terrace system. After this depositional period, the river migrated to the southwest and began a period of downcutting that ended with the formation of the unconformity (erosional terrace) that lies some 45 ft. beneath the modern-day river. The protracted southwestward migration of the river system is perhaps the best indication that pre-historic tectonism exerts an influence on the modern-day alluvial system.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Southeastern Geology","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","issn":"00383678","usgsCitation":"Leeth, D., and Nagle, D., 1996, Shallow subsurface geology of part of the Savannah River alluvial valley in the upper Coastal Plain of Georgia and South Carolina: Southeastern Geology, v. 36, no. 1, p. 1-14.","startPage":"1","endPage":"14","numberOfPages":"14","costCenters":[],"links":[{"id":226997,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"36","issue":"1","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505b8e3ee4b08c986b3187fc","contributors":{"authors":[{"text":"Leeth, D.C.","contributorId":12991,"corporation":false,"usgs":true,"family":"Leeth","given":"D.C.","affiliations":[],"preferred":false,"id":380224,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Nagle, D.D.","contributorId":59072,"corporation":false,"usgs":true,"family":"Nagle","given":"D.D.","email":"","affiliations":[],"preferred":false,"id":380225,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70018597,"text":"70018597 - 1996 - Wide angle X-ray scattering (WAXS) study of \"two-line\" ferrihydrite structure: Effect of arsenate sorption and counterion variation and comparison with EXAFS results","interactions":[],"lastModifiedDate":"2020-01-07T12:53:32","indexId":"70018597","displayToPublicDate":"1996-01-01T00:00:00","publicationYear":"1996","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1759,"text":"Geochimica et Cosmochimica Acta","active":true,"publicationSubtype":{"id":10}},"title":"Wide angle X-ray scattering (WAXS) study of \"two-line\" ferrihydrite structure: Effect of arsenate sorption and counterion variation and comparison with EXAFS results","docAbstract":"Wide angle X-ray scattering (WAXS) measurements have been made on a suite of “two-line” ferrihydrite (FHY2) samples containing varying amounts of coprecipitated arsenate. Samples prepared at pH 8 with counter ions chloride, nitrate, and a mixture of both also were examined. The raw WAXS scattering functions show that “two-line” ferrihydrite actually has a large number of non-Bragg (i.e., diffuse scattering) maxima up to our observation limit of 16 Å−1. The type of counter ion used during synthesis produces no significant change in this function. In unarsenated samples, Radial Distribution Functions (RDFs) produced from the scattering functions show a well-defined Fe-O peak at 2.02 Å in excellent agreement with the mean distance of 2.01 Å from extended X-ray absorption fine structure (EXAFS) analysis. The area under the Fe-O peak is consistent with only octahedral oxygen coordination about iron, and an iron coordination about oxygen of 2.2, in agreement with the EXAFS results, the sample composition, and XANES measurements. The second peak observed in the RDFs is clearly divided into two populations of correlations, at 3.07 and 3.52 Å, respectively. These distances are close to the EXAFS-derived Fe-Fe subshell distances of 3.02–3.05 and 3.43–3.46 Å, respectively, though this is misleading as the RDF peaks also include contributions from O-Fe and O-O correlations. Simulated RDFs of the FeOOH polymorphs indicate how the observed RDF structure relates to the EXAFS pair-correlation function, and allow comparisons with an ordered ferrihydrite structure.
","language":"English","publisher":"Elsevier","doi":"10.1016/0016-7037(96)89830-9","issn":"00167037","usgsCitation":"Waychunas, G., Fuller, C.C., Rea, B., and Davis, J., 1996, Wide angle X-ray scattering (WAXS) study of \"two-line\" ferrihydrite structure: Effect of arsenate sorption and counterion variation and comparison with EXAFS results: Geochimica et Cosmochimica Acta, v. 60, no. 10, p. 1765-1781, https://doi.org/10.1016/0016-7037(96)89830-9.","productDescription":"17 p.","startPage":"1765","endPage":"1781","numberOfPages":"17","costCenters":[{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":479167,"rank":1,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1016/0016-7037(96)89830-9","text":"Publisher Index Page"},{"id":227349,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"60","issue":"10","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505bd0a8e4b08c986b32efb5","contributors":{"authors":[{"text":"Waychunas, G.A.","contributorId":90888,"corporation":false,"usgs":true,"family":"Waychunas","given":"G.A.","email":"","affiliations":[],"preferred":false,"id":380172,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Fuller, C. C.","contributorId":29858,"corporation":false,"usgs":true,"family":"Fuller","given":"C.","email":"","middleInitial":"C.","affiliations":[],"preferred":false,"id":380169,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Rea, B.A.","contributorId":39008,"corporation":false,"usgs":true,"family":"Rea","given":"B.A.","email":"","affiliations":[],"preferred":false,"id":380170,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Davis, J.A.","contributorId":71694,"corporation":false,"usgs":true,"family":"Davis","given":"J.A.","email":"","affiliations":[],"preferred":false,"id":380171,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70018590,"text":"70018590 - 1996 - Herbicide metabolites in surface water and groundwater: Introduction and overview","interactions":[],"lastModifiedDate":"2020-01-03T16:55:57","indexId":"70018590","displayToPublicDate":"1996-01-01T00:00:00","publicationYear":"1996","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":612,"text":"ACS Symposium Series","active":true,"publicationSubtype":{"id":10}},"title":"Herbicide metabolites in surface water and groundwater: Introduction and overview","docAbstract":"Several future research topics for herbicide metabolites in surface and ground water are outlined in this chapter. They are herbicide usage, chemical analysis of metabolites, and fate and transport of metabolites in surface and ground water. These three ideas follow the themes in this book, which are the summary of a symposium of the American Chemical Society on herbicide metabolites in surface and ground water. First, geographic information systems allow the spatial distribution of herbicide-use data to be combined with geochemical information on fate and transport of herbicides. Next these two types of information are useful in predicting the kinds of metabolites present and their probable distribution in surface and ground water. Finally, methods development efforts may be focused on these specific target analytes. This chapter discusses these three concepts and provides an introduction to this book on the analysis, chemistry, and fate and transport of herbicide metabolites in surface and ground water.","language":"English","publisher":"ACS","doi":"10.1021/bk-1996-0630.ch001","issn":"00976156","usgsCitation":"Thurman, E., and Meyer, M.T., 1996, Herbicide metabolites in surface water and groundwater: Introduction and overview: ACS Symposium Series, v. 630, 15 p., https://doi.org/10.1021/bk-1996-0630.ch001.","productDescription":"15 p.","costCenters":[{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":227218,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"630","noUsgsAuthors":false,"publicationDate":"2009-07-23","publicationStatus":"PW","scienceBaseUri":"505a3063e4b0c8380cd5d5e1","contributors":{"authors":[{"text":"Thurman, E.M.","contributorId":102864,"corporation":false,"usgs":true,"family":"Thurman","given":"E.M.","affiliations":[],"preferred":false,"id":380147,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Meyer, M. T.","contributorId":92279,"corporation":false,"usgs":true,"family":"Meyer","given":"M.","email":"","middleInitial":"T.","affiliations":[],"preferred":false,"id":380146,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70018582,"text":"70018582 - 1996 - Reactive transport modeling of acidic metal-contaminated ground water at a site with sparse spatial information","interactions":[],"lastModifiedDate":"2018-09-19T10:59:38","indexId":"70018582","displayToPublicDate":"1996-01-01T00:00:00","publicationYear":"1996","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3280,"text":"Reviews in Mineralogy","active":true,"publicationSubtype":{"id":10}},"title":"Reactive transport modeling of acidic metal-contaminated ground water at a site with sparse spatial information","docAbstract":"No abstract available.
","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Reviews in Mineralogy","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","issn":"02750279","usgsCitation":"Glynn, P., and Brown, J., 1996, Reactive transport modeling of acidic metal-contaminated ground water at a site with sparse spatial information: Reviews in Mineralogy, v. 34, p. 377-438.","productDescription":"62 p.","startPage":"377","endPage":"438","costCenters":[{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":227126,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"34","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a958ae4b0c8380cd81aa2","contributors":{"authors":[{"text":"Glynn, P.","contributorId":56394,"corporation":false,"usgs":true,"family":"Glynn","given":"P.","affiliations":[],"preferred":false,"id":380109,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Brown, J.","contributorId":57801,"corporation":false,"usgs":true,"family":"Brown","given":"J.","affiliations":[],"preferred":false,"id":380110,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70018564,"text":"70018564 - 1996 - A top specified boundary layer (TSBL) approximation approach for the simulation of groundwater contamination processes","interactions":[],"lastModifiedDate":"2012-03-12T17:19:24","indexId":"70018564","displayToPublicDate":"1996-01-01T00:00:00","publicationYear":"1996","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":"A top specified boundary layer (TSBL) approximation approach for the simulation of groundwater contamination processes","docAbstract":"This paper presents improvements in the 'classical boundary layer' (CBL) approximation method to obtain simple but robust initial characterization of aquifer contamination processes. Contaminants are considered to penetrate into the groundwater through the free surface of the aquifer. The improved method developed in this study is termed the 'top specified boundary layer' (TSBL) approach. It involves the specification of the contaminant concentration at the top of the contaminated 'region of interest' (ROI), which is simulated as a boundary layer. the TSBL modification significantly improves the ability of the boundary layer method to predict the development of concentration profiles over both space and time. The TSBL method can be useful for the simulation of cases in which the contaminant concentration is prescribed at the aquifer's free surface as well as for cases in which the contaminant mass flux is prescribed at the surface.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Journal of Contaminant Hydrology","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1016/0169-7722(95)00083-6","issn":"01697722","usgsCitation":"Rubin, H., and Buddemeier, R., 1996, A top specified boundary layer (TSBL) approximation approach for the simulation of groundwater contamination processes: Journal of Contaminant Hydrology, v. 22, no. 1-2, p. 123-144, https://doi.org/10.1016/0169-7722(95)00083-6.","startPage":"123","endPage":"144","numberOfPages":"22","costCenters":[],"links":[{"id":205933,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/0169-7722(95)00083-6"},{"id":227525,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"22","issue":"1-2","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059e5ffe4b0c8380cd470bc","contributors":{"authors":[{"text":"Rubin, H.","contributorId":54358,"corporation":false,"usgs":true,"family":"Rubin","given":"H.","email":"","affiliations":[],"preferred":false,"id":380052,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Buddemeier, R. W.","contributorId":86492,"corporation":false,"usgs":true,"family":"Buddemeier","given":"R. W.","affiliations":[],"preferred":false,"id":380053,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70018554,"text":"70018554 - 1996 - Effects of winter atmospheric circulation on temporal and spatial variability in annual streamflow in the western United States","interactions":[],"lastModifiedDate":"2024-01-22T16:11:32.939879","indexId":"70018554","displayToPublicDate":"1996-01-01T00:00:00","publicationYear":"1996","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1927,"text":"Hydrological Sciences Journal","active":true,"publicationSubtype":{"id":10}},"title":"Effects of winter atmospheric circulation on temporal and spatial variability in annual streamflow in the western United States","docAbstract":"Winter mean 700-hectoPascal (hPa) height anomalies, representing the average atmospheric circulation during the snow season, are compared with annual streamflow measured at 140 streamgauges in the western United States. Correlation and anomaly pattern analyses are used to identify relationships between winter mean atmospheric circulation and temporal and spatial variability in annual streamflow. Results indicate that variability in winter mean 700-Hpa height anomalies accounts for a statistically significant portion of the temporal variability in annual streamflow in the western United States. In general, above-average annual streamflow is associated with negative winter mean 700-Hpa height anomalies over the eastern North Pacific Ocean and/or the western United States. The anomalies produce an anomalous flow of moist air from the eastern North Pacific Ocean into the western United States that increases winter precipitation and snowpack accumulations, and subsequently streamflow. Winter mean 700-hPa height anomalies also account for statistically significant differences in spatial distributions of annual streamflow. As part of this study, winter mean atmospheric circulation patterns for the 40 years analysed were classified into five winter mean 700-hPa height anomaly patterns. These patterns are related to statistically significant and physically meaningful differences in spatial distributions of annual streamflow.
","language":"English","publisher":"Taylor & Francis","doi":"10.1080/02626669609491556","issn":"02626667","usgsCitation":"McCabe, G.J., 1996, Effects of winter atmospheric circulation on temporal and spatial variability in annual streamflow in the western United States: Hydrological Sciences Journal, v. 41, no. 6, p. 873-887, https://doi.org/10.1080/02626669609491556.","productDescription":"15 p.","startPage":"873","endPage":"887","numberOfPages":"15","costCenters":[],"links":[{"id":479061,"rank":2,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1080/02626669609491556","text":"Publisher Index Page"},{"id":227347,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"41","issue":"6","noUsgsAuthors":false,"publicationDate":"2009-12-24","publicationStatus":"PW","scienceBaseUri":"505a0848e4b0c8380cd51a63","contributors":{"authors":[{"text":"McCabe, G. J. Jr.","contributorId":77551,"corporation":false,"usgs":true,"family":"McCabe","given":"G.","suffix":"Jr.","email":"","middleInitial":"J.","affiliations":[],"preferred":false,"id":380025,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70018551,"text":"70018551 - 1996 - Infiltration and solute transport experiments in unsaturated sand and gravel, Cape Cod, Massachusetts: Experimental design and overview of results","interactions":[],"lastModifiedDate":"2019-02-19T06:02:23","indexId":"70018551","displayToPublicDate":"1996-01-01T00:00:00","publicationYear":"1996","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":"Infiltration and solute transport experiments in unsaturated sand and gravel, Cape Cod, Massachusetts: Experimental design and overview of results","docAbstract":"A series of infiltration and tracer experiments was conducted in unsaturated sand and gravel deposits on Cape Cod, Massachusetts. A network of 112 porous cup lysimeters and 168 time domain reflectometry (TDR) probes was deployed at depths from 0.25 to 2.0 m below ground surface along the centerline of a 2-m by 10-m test plot. The test plot was irrigated at rates ranging from 7.9 to 37.0 cm h−1 through a sprinkler system. Transient and steady state water content distributions were monitored with the TDR probes and spatial properties of water content distributions were determined from the TDR data. The spatial variance of the water content tended to increase as the average water content increased. In addition, estimated horizontal correlation length scales for water content were significantly smaller than those estimated by previous investigators for saturated hydraulic conductivity. Under steady state flow conditions at each irrigation rate, a sodium chloride solution was released as a tracer at ground surface and tracked with both the lysimeter and TDR networks. Transect-averaged breakthrough curves at each monitoring depth were constructed both from solute concentrations measured in the water samples and flux concentrations inferred from the TDR measurements. Transport properties, including apparent solute velocities, dispersion coefficients, and total mass balances, were determined independently from both sets of breakthrough curves. The dispersion coefficients tended to increase with depth, reaching a constant value with the lysimeter data and appearing to increase continually with the TDR data. The variations with depth of the solute transport parameters, along with observations of water and solute mass balance and spatial distributions of water content, provide evidence of significant three-dimensional flow during the irrigation experiments. The TDR methods are shown to efficiently provide dense spatial and temporal data sets for both flow and solute transport in unsaturated sediments with minimal sediment and flow field disturbance. Combined implementation of lysimeters and TDR probes can enhance data interpretation particularly when three-dimensional flow conditions are anticipated.
","language":"English","publisher":"American Geophysical Union","doi":"10.1029/95WR02972","usgsCitation":"Rudolph, D.L., Kachanoski, R.G., Celia, M.A., LeBlanc, D.R., and Stevens, J.H., 1996, Infiltration and solute transport experiments in unsaturated sand and gravel, Cape Cod, Massachusetts: Experimental design and overview of results: Water Resources Research, v. 32, no. 3, p. 519-532, https://doi.org/10.1029/95WR02972.","productDescription":"14 p.","startPage":"519","endPage":"532","costCenters":[{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":479060,"rank":1,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1029/95wr02972","text":"Publisher Index Page"},{"id":227304,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"32","issue":"3","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a3af2e4b0c8380cd620d9","contributors":{"authors":[{"text":"Rudolph, David L.","contributorId":189474,"corporation":false,"usgs":false,"family":"Rudolph","given":"David","email":"","middleInitial":"L.","affiliations":[],"preferred":false,"id":380017,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Kachanoski, R. Gary","contributorId":189475,"corporation":false,"usgs":false,"family":"Kachanoski","given":"R.","email":"","middleInitial":"Gary","affiliations":[],"preferred":false,"id":380018,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Celia, Michael A.","contributorId":189683,"corporation":false,"usgs":false,"family":"Celia","given":"Michael","email":"","middleInitial":"A.","affiliations":[],"preferred":false,"id":380015,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"LeBlanc, Denis R. 0000-0002-4646-2628 dleblanc@usgs.gov","orcid":"https://orcid.org/0000-0002-4646-2628","contributorId":1696,"corporation":false,"usgs":true,"family":"LeBlanc","given":"Denis","email":"dleblanc@usgs.gov","middleInitial":"R.","affiliations":[{"id":466,"text":"New England Water Science Center","active":true,"usgs":true}],"preferred":true,"id":380019,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Stevens, Jonathon H.","contributorId":29497,"corporation":false,"usgs":false,"family":"Stevens","given":"Jonathon","email":"","middleInitial":"H.","affiliations":[],"preferred":false,"id":380016,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}} ,{"id":70018534,"text":"70018534 - 1996 - Controls on surface water chemistry in the upper Merced River basin, Yosemite National Park, California","interactions":[],"lastModifiedDate":"2024-03-27T11:11:58.746183","indexId":"70018534","displayToPublicDate":"1996-01-01T00:00:00","publicationYear":"1996","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1924,"text":"Hydrological Processes","active":true,"publicationSubtype":{"id":10}},"title":"Controls on surface water chemistry in the upper Merced River basin, Yosemite National Park, California","docAbstract":"Surface water draining granitic bedrock in Yosemite National Park exhibits considerable variability in chemical composition, despite the relative homogeneity of bedrock chemistry. Other geological factors, including the jointing and distribution of glacial till, appear to exert strong controls on water composition. Chemical data from three surface water surveys in the upper Merced River basin conducted in August 1981, June 1988 and August 1991 were analysed and compared with mapped geological, hydrological and topographic features to identify the solute sources and processes that control water chemistry within the basin during baseflow. Water at most of the sampling sites was dilute, with alkalinities ranging from 26 to 77 μequiv. l−1. Alkalinity was much higher in two subcatchments, however, ranging from 51 to 302 μequiv. l−1. Base cations and silica were also significantly higher in these two catchments than in the rest of the watershed. Concentrations of weathering products in surface water were correlated to the fraction of each subcatchment underlain by surficial material, which is mostly glacial till. Silicate mineral weathering is the dominant control on concentrations of alkalinity, silica and base cations, and ratios of these constituents in surface water reflect the composition of local bedrock. Chloride concentrations in surface water samples varied widely, ranging from <1 to 96 μequiv. l−1. The annual volume-weighted mean chloride concentration in the Merced River at the Happy Isles gauge from 1968 to 1990 was 26 μequiv. l−1, which was five times higher than in atmospheric deposition (4–5 μequiv. l−1), suggesting that a source of chloride exists within the watershed. Saline groundwater springs, whose locations are probably controlled by vertical jointing in the bedrock, are the most likely source of the chloride. Sulphate concentrations varied much less than most other solutes, ranging from 3 to 14 μequiv. l−1. Concentrations of sulphate in quarterly samples collected at the watershed outlet also showed relatively little variation, suggesting that sulphate may be regulated to some extent by a within-watershed process, such as sulphate adsorption.
A study was conducted in 1992 to assess the effects of anthropogenic activities and land use on the water quality of the San Joaquin River and its major tributaries. This study focused on pesticides and organic contaminants, looking at distributions of contaminants in water, bed and suspended sediment, and the bivalve Corbicula fluminea. Results indicated that this river system is affected by agricultural practices and urban runoff. Sediments from Dry Creek contained elevated concentrations of polycyclic aromatic hydrocarbons (PAHs), possibly derived from urban runoff from the city of Modesto; suspended sediments contained elevated amounts of chlordane. Trace levels of triazine herbicides atrazine and simazine were present in water at most sites. Sediments, water, and bivalves from Orestimba Creek, a westside tributary draining agricultural areas, contained the greatest levels of DDT (1,1,1-trichloro-2-2-bis[p-chlorophenyl]ethane), and its degradates DDD (1,1-dichloro-2,2-bis[p-chlorophenyl]ethane), and DDE (1,1-dichloro-2,2- bis[p-chlorophenyl]ethylene). Sediment adsorption co efficients (K(oc)), and bioconcentration factors (BCF) in Corbicula of DDT, DDD, and DDE at Orestimba Creek were greater than predicted values. Streams of the western San Joaquin Valley can potentially transport significant amounts of chlorinated pesticides to the San Joaquin River, the delta, and San Francisco Bay. Organochlorine compounds accumulate in bivalves and sediment and may pose a problem to other biotic species in this watershed.
","language":"English","publisher":"Wiley","doi":"10.1897/1551-5028(1996)015<0172:OAAOPA>2.3.CO;2","usgsCitation":"Pereira, W.E., Domagalski, J.L., Hostettler, F., Brown, L., and Rapp, J.B., 1996, Occurrence and accumulation of pesticides and organic contaminants in river sediment, water and clam tissues from the San Joaquin River and tributaries, California: Environmental Toxicology and Chemistry, v. 15, no. 2, p. 172-180, https://doi.org/10.1897/1551-5028(1996)015<0172:OAAOPA>2.3.CO;2.","productDescription":"9 p.","startPage":"172","endPage":"180","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[{"id":154,"text":"California Water Science Center","active":true,"usgs":true},{"id":552,"text":"San Francisco Bay-Delta","active":false,"usgs":true},{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true},{"id":5079,"text":"Pacific Regional Director's Office","active":true,"usgs":true}],"links":[{"id":226992,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"California","otherGeospatial":"San Joaquin River and tributaries","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -119.06982421874999,\n 36.87962060502676\n ],\n [\n -120.728759765625,\n 38.66835610151506\n ],\n [\n -121.17919921875001,\n 39.58875727696545\n ],\n [\n -121.728515625,\n 39.9434364619742\n ],\n [\n -122.728271484375,\n 39.53793974517628\n ],\n [\n -122.178955078125,\n 38.315801006824984\n ],\n [\n -122.135009765625,\n 38.06539235133249\n ],\n [\n -120.377197265625,\n 36.89719446989036\n ],\n [\n -119.06982421874999,\n 36.87962060502676\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"15","issue":"2","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a6b27e4b0c8380cd74547","contributors":{"authors":[{"text":"Pereira, W. E.","contributorId":46981,"corporation":false,"usgs":true,"family":"Pereira","given":"W.","email":"","middleInitial":"E.","affiliations":[],"preferred":false,"id":379954,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Domagalski, Joseph L. 0000-0002-6032-757X joed@usgs.gov","orcid":"https://orcid.org/0000-0002-6032-757X","contributorId":1330,"corporation":false,"usgs":true,"family":"Domagalski","given":"Joseph","email":"joed@usgs.gov","middleInitial":"L.","affiliations":[{"id":154,"text":"California Water Science Center","active":true,"usgs":true}],"preferred":true,"id":379953,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Hostettler, F. D.","contributorId":99563,"corporation":false,"usgs":true,"family":"Hostettler","given":"F. D.","affiliations":[],"preferred":false,"id":379956,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Brown, L. R. 0000-0001-6702-4531","orcid":"https://orcid.org/0000-0001-6702-4531","contributorId":66391,"corporation":false,"usgs":true,"family":"Brown","given":"L. R.","affiliations":[],"preferred":false,"id":379955,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Rapp, J. B.","contributorId":28987,"corporation":false,"usgs":true,"family":"Rapp","given":"J.","email":"","middleInitial":"B.","affiliations":[],"preferred":false,"id":379952,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}} ,{"id":70018529,"text":"70018529 - 1996 - Hydrologic impact of Great Flood of 1993 in south-central Kansas","interactions":[],"lastModifiedDate":"2024-05-08T14:43:30.236568","indexId":"70018529","displayToPublicDate":"1996-01-01T00:00:00","publicationYear":"1996","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2362,"text":"Journal of Irrigation and Drainage Engineering","active":true,"publicationSubtype":{"id":10}},"title":"Hydrologic impact of Great Flood of 1993 in south-central Kansas","docAbstract":"The writers analyze the hydrologic budget and quantify the ground-water recharge impact of the Great Flood of 1993 on the Great Bend Prairie aquifer of south-central Kansas. During the summer of 1993, rainfall totals exceeded normal levels by 200% in the northern portion of the study area, while air temperature and evapotranspiration were below normal levels. This extreme event provided the opportunity to revisit previously developed recharge-estimation algorithms. Average ground-water recharge for 1993 at four index sites was estimated at 178 mm using the hybrid water-fluctuation method of Sophocleous. Employing the recharge-estimation multiple-regression methodology of Sophocleous for the area, the writers estimated the 1993 recharge to be 145 mm. Both estimates are higher than the maximum annual recharge observed at the index sites during the 1985–1992 period. A January–July 1993 hydrologic balance analysis resulted in 130 mm of recharge. The recharge caused by the flood was three to more than four times the average annual recharge of the previous eight years. The regression-based recharge-estimation methodology proved to be generally reliable, even under extreme conditions.
","language":"English","publisher":"ASCE","doi":"10.1061/(ASCE)0733-9437(1996)122:4(203)","issn":"07339437","usgsCitation":"Sophocleous, M., Stern, A., and Perkins, S., 1996, Hydrologic impact of Great Flood of 1993 in south-central Kansas: Journal of Irrigation and Drainage Engineering, v. 122, no. 4, p. 203-210, https://doi.org/10.1061/(ASCE)0733-9437(1996)122:4(203).","productDescription":"8 p.","startPage":"203","endPage":"210","numberOfPages":"8","costCenters":[],"links":[{"id":227652,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"122","issue":"4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a3636e4b0c8380cd60518","contributors":{"authors":[{"text":"Sophocleous, M.","contributorId":13373,"corporation":false,"usgs":true,"family":"Sophocleous","given":"M.","email":"","affiliations":[],"preferred":false,"id":379947,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Stern, A.J.","contributorId":90485,"corporation":false,"usgs":true,"family":"Stern","given":"A.J.","email":"","affiliations":[],"preferred":false,"id":379948,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Perkins, S.P.","contributorId":12211,"corporation":false,"usgs":true,"family":"Perkins","given":"S.P.","email":"","affiliations":[],"preferred":false,"id":379946,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70018516,"text":"70018516 - 1996 - Effects of glacial meltwater inflows and moat freezing on mixing in an ice-covered antarctic lake as interpreted from stable isotope and tritium distributions","interactions":[],"lastModifiedDate":"2012-03-12T17:19:24","indexId":"70018516","displayToPublicDate":"1996-01-01T00:00:00","publicationYear":"1996","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2620,"text":"Limnology and Oceanography","active":true,"publicationSubtype":{"id":10}},"title":"Effects of glacial meltwater inflows and moat freezing on mixing in an ice-covered antarctic lake as interpreted from stable isotope and tritium distributions","docAbstract":"Perennially ice-covered lakes in the McMurdo Dry Valleys have risen several meters over the past two decades due to climatic warming and increased glacial meltwater inflow. To elucidate the hydrologic responses to changing climate and the effects on lake mixing processes we measured the stable isotope (??18O and ??D) and tritium concentrations of water and ice samples collected in the Lake Fryxell watershed from 1987 through 1990. Stable isotope enrichment resulted from evaporation in stream and moat samples and from sublimation in surface lake-ice samples. Tritium enrichment resulted from exchange with the postnuclear atmosphere in stream and moat samples. Rapid injection of tritiated water into the upper water column of the make and incorporation of this water into the ice cover resulted in uniformly elevated tritium contents (> 3.0 TU) in these reservoirs. Tritium was also present in deep water, suggesting that a component of bottom water was recently at the surface. During summer, melted lake ice and stream water forms the moat. Water excluded from ice formation during fall moat freezing (enriched in solutes and tritium, and depleted in 18O and 2H relative to water below 15-m depth) may sink as density currents to the bottom of the lake. Seasonal lake circulation, in response to climate-driven surface inflow, is therefore responsible for the distribution of both water isotopes and dissolved solutes in Lake Fryxell.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Limnology and Oceanography","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","issn":"00243590","usgsCitation":"Miller, L., and Aiken, G., 1996, Effects of glacial meltwater inflows and moat freezing on mixing in an ice-covered antarctic lake as interpreted from stable isotope and tritium distributions: Limnology and Oceanography, v. 41, no. 5, p. 966-976.","startPage":"966","endPage":"976","numberOfPages":"11","costCenters":[],"links":[{"id":227477,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"41","issue":"5","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a0701e4b0c8380cd51500","contributors":{"authors":[{"text":"Miller, L.G.","contributorId":32522,"corporation":false,"usgs":true,"family":"Miller","given":"L.G.","email":"","affiliations":[],"preferred":false,"id":379905,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Aiken, G. R. 0000-0001-8454-0984","orcid":"https://orcid.org/0000-0001-8454-0984","contributorId":14452,"corporation":false,"usgs":true,"family":"Aiken","given":"G. R.","affiliations":[],"preferred":false,"id":379904,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70018507,"text":"70018507 - 1996 - A catastrophic flood caused by drainage of a caldera lake at Aniakchak Volcano, Alaska, and implications for volcanic hazards assessment","interactions":[],"lastModifiedDate":"2019-04-10T07:53:30","indexId":"70018507","displayToPublicDate":"1996-01-01T00:00:00","publicationYear":"1996","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1786,"text":"Geological Society of America Bulletin","active":true,"publicationSubtype":{"id":10}},"title":"A catastrophic flood caused by drainage of a caldera lake at Aniakchak Volcano, Alaska, and implications for volcanic hazards assessment","docAbstract":"Aniakchak caldera, located on the Alaska Peninsula of southwest Alaska, formerly contained a large lake (estimated volume 3.7 × 109 m3) that rapidly drained as a result of failure of the caldera rim sometime after ca. 3400 yr B.P. The peak discharge of the resulting flood was estimated using three methods: (1) flow-competence equations, (2) step-backwater modeling, and (3) a dam-break model. The results of the dam-break model indicate that the peak discharge at the breach in the caldera rim was at least 7.7 × 104 m3 s−1, and the maximum possible discharge was ≈1.1 × 106 m3 s−1. Flow-competence estimates of discharge, based on the largest boulders transported by the flood, indicate that the peak discharge values, which were a few kilometers downstream of the breach, ranged from 6.4 × 105 to 4.8 × 106 m3 s−1. Similar but less variable results were obtained by step-backwater modeling. Finally, discharge estimates based on regression equations relating peak discharge to the volume and depth of the impounded water, although limited by constraining assumptions, provide results within the range of values determined by the other methods. The discovery and documentation of a flood, caused by the failure of the caldera rim at Aniakchak caldera, underscore the significance and associated hydrologic hazards of potential large floods at other lake-filled calderas.
","language":"English","publisher":"GSA","doi":"10.1130/0016-7606(1996)108<0861:ACFCBD>2.3.CO;2","issn":"00167606","usgsCitation":"Waythomas, C.F., Walder, J.S., McGimsey, R.G., and Neal, C., 1996, A catastrophic flood caused by drainage of a caldera lake at Aniakchak Volcano, Alaska, and implications for volcanic hazards assessment: Geological Society of America Bulletin, v. 108, no. 7, p. 861-871, https://doi.org/10.1130/0016-7606(1996)108<0861:ACFCBD>2.3.CO;2.","productDescription":"11 p.","startPage":"861","endPage":"871","costCenters":[{"id":615,"text":"Volcano Hazards Program","active":true,"usgs":true}],"links":[{"id":227342,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"108","issue":"7","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059e33be4b0c8380cd45ec5","contributors":{"authors":[{"text":"Waythomas, C. F.","contributorId":10065,"corporation":false,"usgs":true,"family":"Waythomas","given":"C.","email":"","middleInitial":"F.","affiliations":[],"preferred":false,"id":379862,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Walder, J. S.","contributorId":32561,"corporation":false,"usgs":true,"family":"Walder","given":"J.","email":"","middleInitial":"S.","affiliations":[],"preferred":false,"id":379863,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"McGimsey, R. G.","contributorId":93921,"corporation":false,"usgs":true,"family":"McGimsey","given":"R.","email":"","middleInitial":"G.","affiliations":[],"preferred":false,"id":379865,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Neal, C.A. 0000-0002-7697-7825","orcid":"https://orcid.org/0000-0002-7697-7825","contributorId":91122,"corporation":false,"usgs":true,"family":"Neal","given":"C.A.","affiliations":[],"preferred":false,"id":379864,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70018490,"text":"70018490 - 1996 - Flow to a well in a water-table aquifer: An improved laplace transform solution","interactions":[],"lastModifiedDate":"2019-02-14T07:17:30","indexId":"70018490","displayToPublicDate":"1996-01-01T00:00:00","publicationYear":"1996","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1861,"text":"Ground Water","active":true,"publicationSubtype":{"id":10}},"title":"Flow to a well in a water-table aquifer: An improved laplace transform solution","docAbstract":"An alternative Laplace transform solution for the problem, originally solved by Neuman, of constant discharge from a partially penetrating well in a water-table aquifer was obtained. The solution differs from existing solutions in that it is simpler in form and can be numerically inverted without the need for time-consuming numerical integration. The derivation invloves the use of the Laplace transform and a finite Fourier cosine series and avoids the Hankel transform used in prior derivations. The solution allows for water in the overlying unsaturated zone to be released either instantaneously in response to a declining water table as assumed by Neuman, or gradually as approximated by Boulton's convolution integral. Numerical evaluation yields results identical with results obtained by previously published methods with the advantage, under most well-aquifer configurations, of much reduced computation time.","language":"English","publisher":"Wiley","doi":"10.1111/j.1745-6584.1996.tb02045.x","issn":"0017467X","usgsCitation":"Moench, A., 1996, Flow to a well in a water-table aquifer: An improved laplace transform solution: Ground Water, v. 34, no. 4, p. 593-604, https://doi.org/10.1111/j.1745-6584.1996.tb02045.x.","productDescription":"12 p.","startPage":"593","endPage":"604","costCenters":[{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":226990,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"34","issue":"4","noUsgsAuthors":false,"publicationDate":"2005-08-04","publicationStatus":"PW","scienceBaseUri":"505a1255e4b0c8380cd54281","contributors":{"authors":[{"text":"Moench, A.F.","contributorId":91495,"corporation":false,"usgs":true,"family":"Moench","given":"A.F.","email":"","affiliations":[],"preferred":false,"id":379785,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70018477,"text":"70018477 - 1996 - Characterization of metal adsorption variability in a sand and gravel aquifer, Cape Cod, Massachusetts, U.S.A","interactions":[],"lastModifiedDate":"2019-02-19T05:49:26","indexId":"70018477","displayToPublicDate":"1996-01-01T00:00:00","publicationYear":"1996","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":"Characterization of metal adsorption variability in a sand and gravel aquifer, Cape Cod, Massachusetts, U.S.A","docAbstract":"Several geochemical properties of an aquifer sediment that control metal-ion adsorption were investigated to determine their potential use as indicators of the spatial variability of metal adsorption. Over the length of a 4.5-m-long core from a sand and gravel aquifer, lead (Pb2+) and zinc (Zn2+) adsorption at constant chemical conditions (pH 5.3) varied by a factor of 2 and 4, respectively. Pb2+ and Zn2+ were adsorbed primarily by Fe- and Al-oxide coatings on quartz-grain surfaces. Per unit surface area, both Pb2+ and Zn2+ adsorption were significantly correlated with the amount of Fe and Al that dissolved from the aquifer material in a partial chemical extraction. The variability in conditional binding constants for Pb2+ and Zn2+ adsorption (log KADS) derived from a simple non-electrostatic surface complexation model were also predicted by extracted Fe and Al normalized to surface area. Because the abundance of Fe- and Al-oxide coatings that dominate adsorption does not vary inversely with grain size by a simple linear relationship, only a weak, negative correlation was found between the spatial variability of Pb2+ adsorption and grain size in this aquifer. The correlation between Zn2+ adsorption and grain size was not significant. Partial chemical extractions combined with surface-area measurements have potential use for estimating metal adsorption variability in other sand and gravel aquifers of negligible carbonate and organic carbon content.","language":"English","publisher":"Elsevier","doi":"10.1016/0169-7722(95)00090-9","issn":"01697722","usgsCitation":"Fuller, C.C., Davis, J., Coston, J., and Dixon, E., 1996, Characterization of metal adsorption variability in a sand and gravel aquifer, Cape Cod, Massachusetts, U.S.A: Journal of Contaminant Hydrology, v. 22, no. 3-4, p. 165-187, https://doi.org/10.1016/0169-7722(95)00090-9.","productDescription":"23 p.","startPage":"165","endPage":"187","costCenters":[{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":227475,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Massachusetts","otherGeospatial":"Cape Cod","volume":"22","issue":"3-4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059f4cfe4b0c8380cd4bf2c","contributors":{"authors":[{"text":"Fuller, C. C.","contributorId":29858,"corporation":false,"usgs":true,"family":"Fuller","given":"C.","email":"","middleInitial":"C.","affiliations":[],"preferred":false,"id":379730,"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":379732,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Coston, J.A.","contributorId":59572,"corporation":false,"usgs":true,"family":"Coston","given":"J.A.","email":"","affiliations":[],"preferred":false,"id":379731,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Dixon, E.","contributorId":79254,"corporation":false,"usgs":true,"family":"Dixon","given":"E.","affiliations":[],"preferred":false,"id":379733,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70018465,"text":"70018465 - 1996 - Effect of snow and firn hydrology on the physical and chemical characteristics of glacial runoff","interactions":[],"lastModifiedDate":"2024-03-27T11:18:18.285205","indexId":"70018465","displayToPublicDate":"1996-01-01T00:00:00","publicationYear":"1996","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1924,"text":"Hydrological Processes","active":true,"publicationSubtype":{"id":10}},"title":"Effect of snow and firn hydrology on the physical and chemical characteristics of glacial runoff","docAbstract":"Near-surface processes on glaciers, including water flow over bare ice and through seasonal snow and firn, have a significant effect on the speed, volume and chemistry of water flow through the glacier. The transient nature of the seasonal snow profoundly affects the water discharge and chemistry. Water flow through snow is fairly slow compared with flow over bare ice and a thinning snowpack on a glacier decreases the delay between peak meltwater input and peak stream discharge. Furthermore, early spring melt flushes the snowpack of solutes and by mid-summer the melt water flowing into the glacier is fairly clean by comparison. The firn, a relatively constant feature of glaciers, attenuates variations in water drainage into the glacier by temporarily storing water in saturated layer. Bare ice exerts opposite influences by accentuating variations in runoff by water flowing over the ice surface. The melt of firn and ice contributes relatively clean (solute-free) water to the glacier water system.","language":"English","publisher":"Wiley","issn":"08856087","usgsCitation":"Fountain, A.G., 1996, Effect of snow and firn hydrology on the physical and chemical characteristics of glacial runoff: Hydrological Processes, v. 10, no. 4, p. 509-521.","productDescription":"13 p.","startPage":"509","endPage":"521","numberOfPages":"13","costCenters":[],"links":[{"id":227250,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"10","issue":"4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a0608e4b0c8380cd510b4","contributors":{"authors":[{"text":"Fountain, A. G.","contributorId":29815,"corporation":false,"usgs":true,"family":"Fountain","given":"A.","email":"","middleInitial":"G.","affiliations":[],"preferred":false,"id":379697,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70018461,"text":"70018461 - 1996 - Estimation of rates of aerobic hydrocarbon biodegradation by simulation of gas transport in the unsaturated zone","interactions":[],"lastModifiedDate":"2019-02-20T08:45:28","indexId":"70018461","displayToPublicDate":"1996-01-01T00:00:00","publicationYear":"1996","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":"Estimation of rates of aerobic hydrocarbon biodegradation by simulation of gas transport in the unsaturated zone","docAbstract":"The distribution of oxygen and carbon dioxide gases in the unsaturated zone provides a geochemical signature of aerobic hydrocarbon degradation at petroleum product spill sites. The fluxes of these gases are proportional to the rate of aerobic biodegradation and are quantified by calibrating a mathematical transport model to the oxygen and carbon dioxide gas concentration data. Reaction stoichiometry is assumed to convert the gas fluxes to a corresponding rate of hydrocarbon degradation. The method is applied at a gasoline spill site in Galloway Township, New Jersey, to determine the rate of aerobic degradation of hydrocarbons associated with passive and bioventing remediation field experiments. At the site, microbial degradation of hydrocarbons near the water table limits the migration of hydrocarbon solutes in groundwater and prevents hydrocarbon volatilization into the unsaturated zone. In the passive remediation experiment a site-wide degradation rate estimate of 34,400 g yr−1 (11.7 gal. yr−1) of hydrocarbon was obtained by model calibration to carbon dioxide gas concentration data collected in December 1989. In the bioventing experiment, degradation rate estimates of 46.0 and 47.9 g m−2 yr−1(1.45 × 10−3 and 1.51 × 10−3 gal. ft.−2yr−1) of hydrocarbon were obtained by model calibration to oxygen and carbon dioxide gas concentration data, respectively. Method application was successful in quantifying the significance of a naturally occurring process that can effectively contribute to plume stabilization.
","language":"English","publisher":"American Geophysical Union","doi":"10.1029/96WR00805","usgsCitation":"Lahvis, M.A., and Baehr, A.L., 1996, Estimation of rates of aerobic hydrocarbon biodegradation by simulation of gas transport in the unsaturated zone: Water Resources Research, v. 32, no. 7, p. 2231-2249, https://doi.org/10.1029/96WR00805.","productDescription":"19 p.","startPage":"2231","endPage":"2249","costCenters":[{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":227163,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"32","issue":"7","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a0ba3e4b0c8380cd527f0","contributors":{"authors":[{"text":"Lahvis, Matthew A.","contributorId":104522,"corporation":false,"usgs":true,"family":"Lahvis","given":"Matthew","email":"","middleInitial":"A.","affiliations":[],"preferred":false,"id":379682,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Baehr, Arthur L.","contributorId":104523,"corporation":false,"usgs":true,"family":"Baehr","given":"Arthur","email":"","middleInitial":"L.","affiliations":[],"preferred":false,"id":379681,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70018427,"text":"70018427 - 1996 - Upscaled soil-water retention using van Genuchten's function","interactions":[],"lastModifiedDate":"2024-05-08T14:38:10.740252","indexId":"70018427","displayToPublicDate":"1996-01-01T00:00:00","publicationYear":"1996","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2341,"text":"Journal of Hydrologic Engineering","active":true,"publicationSubtype":{"id":10}},"title":"Upscaled soil-water retention using van Genuchten's function","docAbstract":"Soils are often layered at scales smaller than the block size used in numerical and conceptual models of variably saturated flow. Consequently, the small-scale variability in water content within each block must be homogenized (upscaled). Laboratory results have shown that a linear volume average (LVA) of water content at a uniform suction is a good approximation to measured water contents in heterogeneous cores. Here, we upscale water contents using van Genuchten's function for both the local and upscaled soil-water-retention characteristics. The van Genuchten (vG) function compares favorably with LVA results, laboratory experiments under hydrostatic conditions in 3-cm cores, and numerical simulations of large-scale gravity drainage. Our method yields upscaled vG parameter values by fitting the vG curve to the LVA of water contents at various suction values. In practice, it is more efficient to compute direct averages of the local vG parameter values. Nonlinear power averages quantify a feasible range of values for each upscaled vG shape parameter; upscaled values of N are consistently less than the harmonic means, reflecting broad pore-size distributions of the upscaled soils. The vG function is useful for modeling soil-water retention at large scales, and these results provide guidance for its application.
","language":"English","publisher":"ASCE","doi":"10.1061/(ASCE)1084-0699(1996)1:3(123)","issn":"10840699","usgsCitation":"Green, T., Constantz, J., and Freyberg, D., 1996, Upscaled soil-water retention using van Genuchten's function: Journal of Hydrologic Engineering, v. 1, no. 3, p. 123-130, https://doi.org/10.1061/(ASCE)1084-0699(1996)1:3(123).","productDescription":"8 p.","startPage":"123","endPage":"130","numberOfPages":"8","costCenters":[],"links":[{"id":227296,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"1","issue":"3","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505bbd6ce4b08c986b329000","contributors":{"authors":[{"text":"Green, T.R.","contributorId":86503,"corporation":false,"usgs":true,"family":"Green","given":"T.R.","email":"","affiliations":[],"preferred":false,"id":379541,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Constantz, J.E.","contributorId":22919,"corporation":false,"usgs":true,"family":"Constantz","given":"J.E.","email":"","affiliations":[],"preferred":false,"id":379539,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Freyberg, D.L.","contributorId":66867,"corporation":false,"usgs":true,"family":"Freyberg","given":"D.L.","email":"","affiliations":[],"preferred":false,"id":379540,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ]}