The link between stress and hydrologic properties was examined at two sites that are distinguished by different rock types and different stress states. This investigation is based upon the analysis and interpretation of geophysical logs obtained in water wells at the two locations. At the northeast site (Newark Basin), the hydrologic characteristics of sedimentary rocks are dependent upon the relationship to the current regional stress field of two primary types of orthogonal features that serve as preferential pathways for fluid flow. Subhorizontal bedding-plane partings are highly transmissive near the surface and delineate transversely isotropic fluid flow at shallow depths. With increasing depth, the subhorizontal planes become less dominant and steeply dipping fractures become more influential hydrologically. These high-angle features define anisotropic flow pathways that are preferentially oriented along strike. At the southwest site (west Texas), extrusive rocks are subjected to topographically modified tectonic and gravitational stresses that vary spatially within a valley setting. The attendant changes in stress invariants cause fracture connectivity within the rock mass to systematically increase with depth along the valley flanks, but to remain relatively low in the central valley. The degree of fracture connectivity predicted within this valley configuration is consistent with variations in transmissivity determined at several well locations. In each of these cases, the idealized understanding of the hydrologic system is enhanced by considering the effects of regional and local stresses that act upon the fractured-rock aquifer.
Aims: To evaluate the numbers and selected phenotypic and genotypic characteristics of the faecal indicator bacteria Escherichia coli and enterococci in gull faeces at representative Great Lakes swimming beaches in the United States.
Methods and Results: E. coli and enterococci were enumerated in gull faeces by membrane filtration. E. coli genotypes (rep‐PCR genomic profiles) and E. coli (Vitek® GNI+) and enterococci (API® rapid ID 32 Strep and resistance to streptomycin, gentamicin, vancomycin, tetracycline and ampicillin) phenotypes were determined for isolates obtained from gull faeces both early and late in the swimming season. Identical E. coli genotypes were obtained only from single gull faecal samples but most faecal samples yielded more than one genotype (median of eight genotypes for samples with 10 isolates). E. coli isolates from the same site that clustered at ≥85% similarity were from the same sampling date and shared phenotypic characteristics, and at this similarity level there was population overlap between the two geographically isolated beach sites. Enterococcus API® profiles varied with sampling date. Gull enterococci displayed wide variation in antibiotic resistance patterns, and high‐level resistance to some antibiotics.
Conclusions: Gull faeces could be a major contributor of E. coli (105–109 CFU g−1) and enterococci (104–108 CFU g−1) to Great Lakes recreational waters. E. coli and enterococci in gull faeces are highly variable with respect to their genotypic and phenotypic characteristics and may exhibit temporal or geographic trends in these features.
Significance and Impact of the Study: The high degree of variation in genotypic or phenotypic characteristics of E. coli or enterococci populations within gull hosts will require extensive sampling for adequate characterization, and will influence methods that use these characteristics to determine faecal contamination sources for recreational waters.
","language":"English","publisher":"Wiley","doi":"10.1046/j.1365-2672.2003.01910.x","issn":"13645072","usgsCitation":"Fogarty, L., Haack, S., Wolcott, M.J., and Whitman, R., 2003, Abundance and characteristics of the recreational water quality indicator bacteria Escherichia coli and enterococci in gull faeces: Journal of Applied Microbiology, v. 94, no. 5, p. 865-878, https://doi.org/10.1046/j.1365-2672.2003.01910.x.","productDescription":"14 p.","startPage":"865","endPage":"878","costCenters":[{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":208695,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1046/j.1365-2672.2003.01910.x"},{"id":234617,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"94","issue":"5","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059e659e4b0c8380cd4735f","contributors":{"authors":[{"text":"Fogarty, L.R.","contributorId":27236,"corporation":false,"usgs":true,"family":"Fogarty","given":"L.R.","email":"","affiliations":[],"preferred":false,"id":407467,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Haack, S.K.","contributorId":26457,"corporation":false,"usgs":true,"family":"Haack","given":"S.K.","email":"","affiliations":[],"preferred":false,"id":407466,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Wolcott, M. J. 0000-0002-3924-5940","orcid":"https://orcid.org/0000-0002-3924-5940","contributorId":44110,"corporation":false,"usgs":true,"family":"Wolcott","given":"M.","email":"","middleInitial":"J.","affiliations":[],"preferred":false,"id":407468,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Whitman, R.L.","contributorId":69750,"corporation":false,"usgs":true,"family":"Whitman","given":"R.L.","email":"","affiliations":[],"preferred":false,"id":407469,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70026004,"text":"70026004 - 2003 - Modelling hydrologic responses in a small forested catchment (Panola Mountain, Georgia, USA): A comparison of the original and a new dynamic TOPMODEL","interactions":[],"lastModifiedDate":"2012-03-12T17:20:24","indexId":"70026004","displayToPublicDate":"2003-01-01T00:00:00","publicationYear":"2003","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":"Modelling hydrologic responses in a small forested catchment (Panola Mountain, Georgia, USA): A comparison of the original and a new dynamic TOPMODEL","docAbstract":"Preliminary modelling results for a new version of the rainfall-runoff model TOPMODEL, dynamic TOPMODEL, are compared with those of the original TOPMODEL formulation for predicting streamflow at the Panola Mountain Research Watershed, Georgia. Dynamic TOPMODEL uses a kinematic wave routing of subsurface flow, which allows for dynamically variable upslope contributing areas, while retaining the concept of hydrological similarity to increase computational efficiency. Model performance in predicting discharge was assessed for the original TOPMODEL and for one landscape unit (LU) and three LU versions of the dynamic TOPMODEL (a bare rock area, hillslope with regolith <1 m, and a riparian zone with regolith ???5 m). All simulations used a 30 min time step for each of three water years. Each 1-LU model underpredicted the peak streamflow, and generally overpredicted recession streamflow during wet periods and underpredicted during dry periods. The difference between predicted recession streamflow generally was less for the dynamic TOPMODEL and smallest for the 3-LU model. Bayesian combination of results for different water years within the GLUE methodology left no behavioural original or 1-LU dynamic models and only 168 (of 96 000 sample parameter sets) for the 3-LU model. The efficiency for the streamflow prediction of the best 3-LU model was 0.83 for an individual year, but the results suggest that further improvements could be made. ?? 2003 John Wiley & Sons, Ltd.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Hydrological Processes","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1002/hyp.1128","issn":"08856087","usgsCitation":"Peters, N., Freer, J., and Beven, K., 2003, Modelling hydrologic responses in a small forested catchment (Panola Mountain, Georgia, USA): A comparison of the original and a new dynamic TOPMODEL: Hydrological Processes, v. 17, no. 2, p. 345-362, https://doi.org/10.1002/hyp.1128.","startPage":"345","endPage":"362","numberOfPages":"18","costCenters":[],"links":[{"id":208694,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1002/hyp.1128"},{"id":234616,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"17","issue":"2","noUsgsAuthors":false,"publicationDate":"2003-01-23","publicationStatus":"PW","scienceBaseUri":"505a5c6be4b0c8380cd6fca2","contributors":{"authors":[{"text":"Peters, N.E.","contributorId":33332,"corporation":false,"usgs":true,"family":"Peters","given":"N.E.","email":"","affiliations":[],"preferred":false,"id":407464,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Freer, J.","contributorId":61975,"corporation":false,"usgs":true,"family":"Freer","given":"J.","email":"","affiliations":[],"preferred":false,"id":407465,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Beven, K.","contributorId":25320,"corporation":false,"usgs":true,"family":"Beven","given":"K.","email":"","affiliations":[],"preferred":false,"id":407463,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70025953,"text":"70025953 - 2003 - Selenium isotope fractionation during reduction by Fe(II)-Fe(III) hydroxide-sulfate (green rust)","interactions":[],"lastModifiedDate":"2020-01-05T14:36:54","indexId":"70025953","displayToPublicDate":"2003-01-01T00:00:00","publicationYear":"2003","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":"Selenium isotope fractionation during reduction by Fe(II)-Fe(III) hydroxide-sulfate (green rust)","docAbstract":"We have determined the extent of Se isotope fractionation induced by reduction of selenate by sulfate interlayered green rust (GRSO4), a Fe(II)-Fe(III) hydroxide-sulfate. This compound is known to reduce selenate to Se(0), and it is the only naturally relevant abiotic selenate reduction pathway documented to date. Se reduction reactions, when they occur in nature, greatly reduce Se mobility and bioavailability. Se stable isotope analysis shows promise as an indicator of Se reduction, and Se isotope fractionation by various Se reactions must be known in order to refine this tool. We measured the increase in the 80Se/76Se ratio of dissolved selenate as lighter isotopes were preferentially consumed during reduction by GRSO4. Six different experiments that used GRSO4 made by two methods, with varying solution compositions and pH, yielded identical isotopic fractionations. Regression of all the data yielded an instantaneous isotope fractionation of 7.36 ± 0.24‰. Selenate reduction by GRSO4 induces much greater isotopic fractionation than does bacterial selenate reduction. If selenate reduction by GRSO4 occurs in nature, it may be identifiable on the basis of its relatively large isotopic fractionation.
The mercury-gold deposits of the Ivanhoe mining district in northern Nevada formed when middle Miocene rhyolitic volcanism and high-angle faulting disrupted a shallow lacustrine environment. Sinter and replacement mercury deposits formed at and near the paleosurface, and disseminated gold deposits and high-grade gold-silver veins formed beneath the hot spring deposits. The lacustrine environment provided abundant meteoric water; the rhyolites heated the water; and the faults, flow units, and lakebeds provided fluid pathways for the hydrothermal fluids. A shallow lake began to develop in the Ivanhoe area about 16.5 Ma. The lake progressively expanded and covered the entire area with fine-grained lacustrine sediments. Lacustrine sedimentation continued to at least 14.4 Ma, and periodic fluctuations in the size and extent of the lake may have been responses to both climate and nearby volcanism. The eruption of rhyolite and andesite flows and domes periodically disrupted the lacustrine environment and produced interfingered flows and lake sediments. The major pulse of rhyolitic volcanism took place between 15.16 ± 0.05 and 14.92 ± 0.05 Ma. High-angle faulting began in the basement about 15.2 Ma, penetrated to and disrupted the paleosurface after 15.10 ± 0.06 Ma, and largely ceased by 14.92 ± 0.05 Ma. Ground motion related to both faulting and volcanism created debris flows and soft-sediment deformation in the lakebeds. Mercury-gold mineralization was coeval with rhyolite volcanism and high-angle faulting, and it took place about 15.2 to 14.9 Ma. At and near the paleosurface, hydrothermal fluids migrated through tuffaceous sediments above relatively impermeable volcanic and Paleozoic units, creating chalcedonic, cinnabar-bearing replacement bodies and sinters. Disseminated gold was deposited in sedimentary and volcanic rocks beneath the mercury deposits, although the hydrologic path between the two ore types is unclear. Higher-grade gold-silver deposits formed in massive rhyolites and Paleozoic quartzites at deeper levels, and these mineralized zones possibly represent the feeder zones for the higher-level deposits. Fluctuations in the ground-water table locally produced hydrothermal oxidation of the near-surface mercury and disseminated gold deposits. The locus of mineralization shifted with time, moving south and east from its inception point in the west-central part of the district. Thus, although mineralization in the district took place during a span of 300,000 years, the duration of mineralization at any one place probably was much shorter. The low-sulfidation deposits of the Ivanhoe district formed at the same time and under similar conditions as those in the nearby Midas district, 15 km to the northwest, which includes the large, high-grade Ken Snyder gold-silver epithermal vein deposit. The exposures in the Ivanhoe district are interpreted to represent the near-surface example of the paleosurface that originally was present above the Midas mineralizing system. The resulting combined Ivanhoe-Midas model provides an exploration guide for epithermal deposits in similar geologic environments in northern Nevada.
","language":"English","publisher":"Society of Economic Geologists","doi":"10.2113/gsecongeo.98.2.409","issn":"03610128","usgsCitation":"Wallace, A.R., 2003, Geology of the Ivanhoe Hg-Au district, northern Nevada: Influence of Miocene volcanism, lakes, and active faulting on epithermal mineralization: Economic Geology, v. 98, no. 2, p. 409-424, https://doi.org/10.2113/gsecongeo.98.2.409.","productDescription":"16 p.","startPage":"409","endPage":"424","costCenters":[],"links":[{"id":387485,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"98","issue":"2","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a25cae4b0c8380cd58b8d","contributors":{"authors":[{"text":"Wallace, A. R.","contributorId":59445,"corporation":false,"usgs":true,"family":"Wallace","given":"A.","email":"","middleInitial":"R.","affiliations":[],"preferred":false,"id":406989,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70025850,"text":"70025850 - 2003 - Geomorphic and hydrologic assessment of erosion hazards at the Norman municipal landfill, Canadian River floodplain, central Oklahoma","interactions":[],"lastModifiedDate":"2018-11-16T10:21:33","indexId":"70025850","displayToPublicDate":"2003-01-01T00:00:00","publicationYear":"2003","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1574,"text":"Environmental & Engineering Geoscience","printIssn":"1078-7275","active":true,"publicationSubtype":{"id":10}},"title":"Geomorphic and hydrologic assessment of erosion hazards at the Norman municipal landfill, Canadian River floodplain, central Oklahoma","docAbstract":"The Norman, Oklahoma, municipal landfill closed in 1985 after 63 years of operation, because it was identified as a point source of hazardous leachate composed of organic and inorganic compounds. The landfill is located on the floodplain of the Canadian River, a sand-bed river characterized by erodible channel boundaries and by large variation in mean monthly discharges. In 1986, floodwaters eroded riprap protection at the southern end of the landfill and penetrated the landfill's clay cap, thereby exposing the landfill contents. The impact of this moderate-magnitude flood event (Q12) was the catalyst to investigate erosion hazards at the Norman landfill. This geomorphic investigation analyzed floodplain geomorphology and historical channel changes, flood-frequency distributions, an erosion threshold, the geomorphic effectiveness of discharge events, and other factors that influence erosion hazards at the landfill site. The erosion hazard at the Norman landfill is a function of the location of the landfill with respect to the channel thalweg, erosional resistance of the channel margins, magnitude and duration of discrete discharge events, channel form and hydraulic geometry, and cumulative effects related to a series of discharge events. Based on current climatic conditions and historical channel changes, a minimum erosion threshold is set at bankfull discharge (Q = 572 m3/s). The annual probability of exceeding this threshold is 0.53. In addition, this analysis indicates that peak stream power is less informative than total energy expenditures when estimating the erosion potential or geomorphic effectiveness of discrete discharge events. On the Canadian River, long-duration, moderate-magnitude floods can have larger total energy expenditures than shorter-duration, high-magnitude floods and therefore represent the most serious erosion hazard to floodplain structures.
","language":"English","publisher":"Geological Society of America","doi":"10.2113/9.3.241","issn":"10787275","usgsCitation":"Curtis, J.A., and Whitney, J.W., 2003, Geomorphic and hydrologic assessment of erosion hazards at the Norman municipal landfill, Canadian River floodplain, central Oklahoma: Environmental & Engineering Geoscience, v. 9, no. 3, p. 241-252, https://doi.org/10.2113/9.3.241.","productDescription":"12 p.","startPage":"241","endPage":"252","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[{"id":154,"text":"California Water Science Center","active":true,"usgs":true},{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":234503,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":208632,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.2113/9.3.241"}],"volume":"9","issue":"3","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a277de4b0c8380cd5992f","contributors":{"authors":[{"text":"Curtis, Jennifer A. 0000-0001-7766-994X jacurtis@usgs.gov","orcid":"https://orcid.org/0000-0001-7766-994X","contributorId":927,"corporation":false,"usgs":true,"family":"Curtis","given":"Jennifer","email":"jacurtis@usgs.gov","middleInitial":"A.","affiliations":[{"id":154,"text":"California Water Science Center","active":true,"usgs":true}],"preferred":true,"id":406816,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Whitney, John W. 0000-0003-3824-3692 jwhitney@usgs.gov","orcid":"https://orcid.org/0000-0003-3824-3692","contributorId":804,"corporation":false,"usgs":true,"family":"Whitney","given":"John","email":"jwhitney@usgs.gov","middleInitial":"W.","affiliations":[{"id":318,"text":"Geosciences and Environmental Change Science Center","active":true,"usgs":true}],"preferred":true,"id":406815,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70025847,"text":"70025847 - 2003 - The sedimentary record of climatic and anthropogenic influence on the Patuxent estuary and Chesapeake Bay ecosystems","interactions":[],"lastModifiedDate":"2012-03-12T17:20:32","indexId":"70025847","displayToPublicDate":"2003-01-01T00:00:00","publicationYear":"2003","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1583,"text":"Estuaries","active":true,"publicationSubtype":{"id":10}},"title":"The sedimentary record of climatic and anthropogenic influence on the Patuxent estuary and Chesapeake Bay ecosystems","docAbstract":"Ecological and paleoecological studies from the Patuxent River mouth reveal dynamic variations in benthic ostracode assemblages over the past 600 years due to climatic and anthropogenic factors. Prior to the late 20th century, centennial-scale changes in species dominance were influenced by climatic and hydrological factors that primarily affected salinity and at times led to oxygen depletion. Decadal-scale droughts also occurred resulting in higher salinities and migration of ostracode species from the deep channel (Loxoconcha sp., Cytheromorpha newportensis) into shallower water along the flanks of the bay. During the 19th century the abundance of Leptocythere nikraveshae and Perissocytheridea brachyforma suggest increased turbidity and decreased salinity. Unprecedented changes in benthic ostracodes at the Patuxent mouth and in the deep channel of the bay occurred after the 1960s when Cytheromorpha curta became the dominant species, reflecting seasonal anoxia. The change in benthic assemblages coincided with the appearance of deformities in foraminifers. A combination of increased nitrate loading due to greater fertilizer use and increased freshwater flow explains this shift. A review of the geochemical and paleoecological evidence for dissolved oxygen indicates that seasonal oxygen depletion in the main channel of Chesapeake Bay varies over centennial and decadal timescales. Prior to 1700 AD, a relatively wet climate and high freshwater runoff led to oxygen depletion but rarely anoxia. Between 1700 and 1900, progressive eutrophication occurred related to land dearance and increased sedimentation, but this was superimposed on the oscillatory pattern of oxygen depletion most likely driven by climatological and hydrological factors. It also seems probable that the four- to five-fold increase in sedimentation due to agricultural and timber activity could have contributed to an increased natural nutrient load, likely fueling the early periods (1700-1900) of hypoxla prior to widespread fertilizer use. Twentieth-century anoxia worsened in the late 1930s-1940s and again around 1970, reaching unprecedented levels in the past few decades. Decadal and interannual variability in oxygen depletion even in the 20th century is still strongly influenced by climatic processes influencing precipitation and freshwater runoff.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Estuaries","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","issn":"01608347","usgsCitation":"Cronin, T.M., and Vann, C., 2003, The sedimentary record of climatic and anthropogenic influence on the Patuxent estuary and Chesapeake Bay ecosystems: Estuaries, v. 26, no. 2 A, p. 196-209.","startPage":"196","endPage":"209","numberOfPages":"14","costCenters":[],"links":[{"id":235011,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"26","issue":"2 A","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505bb005e4b08c986b324b8c","contributors":{"authors":[{"text":"Cronin, T. M. 0000-0002-2643-0979","orcid":"https://orcid.org/0000-0002-2643-0979","contributorId":42613,"corporation":false,"usgs":true,"family":"Cronin","given":"T.","email":"","middleInitial":"M.","affiliations":[{"id":40020,"text":"Florence Bascom Geoscience Center","active":true,"usgs":true}],"preferred":false,"id":406807,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Vann, C.D.","contributorId":51951,"corporation":false,"usgs":true,"family":"Vann","given":"C.D.","email":"","affiliations":[],"preferred":false,"id":406808,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70025805,"text":"70025805 - 2003 - Modeling Np and Pu transport with a surface complexation model and spatially variant sorption capacities: Implications for reactive transport modeling and performance assessments of nuclear waste disposal sites","interactions":[],"lastModifiedDate":"2018-11-19T09:14:44","indexId":"70025805","displayToPublicDate":"2003-01-01T00:00:00","publicationYear":"2003","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1315,"text":"Computers & Geosciences","printIssn":"0098-3004","active":true,"publicationSubtype":{"id":10}},"title":"Modeling Np and Pu transport with a surface complexation model and spatially variant sorption capacities: Implications for reactive transport modeling and performance assessments of nuclear waste disposal sites","docAbstract":"One-dimensional (1D) geochemical transport modeling is used to demonstrate the effects of speciation and sorption reactions on the ground-water transport of Np and Pu, two redox-sensitive elements. Earlier 1D simulations (Reardon, 1981) considered the kinetically limited dissolution of calcite and its effect on ion-exchange reactions (involving 90Sr, Ca, Na, Mg and K), and documented the spatial variation of a 90Sr partition coefficient under both transient and steady-state chemical conditions. In contrast, the simulations presented here assume local equilibrium for all reactions, and consider sorption on constant potential, rather than constant charge, surfaces. Reardon's (1981) seminal findings on the spatial and temporal variability of partitioning (of 90Sr) are reexamined and found partially caused by his assumption of a kinetically limited reaction.
In the present work, sorption is assumed the predominant retardation process controlling Pu and Np transport, and is simulated using a diffuse-double-layer-surface-complexation (DDLSC) model. Transport simulations consider the infiltration of Np- and Pu-contaminated waters into an initially uncontaminated environment, followed by the cleanup of the resultant contamination with uncontaminated water. Simulations are conducted using different spatial distributions of sorption capacities (with the same total potential sorption capacity, but with different variances and spatial correlation structures). Results obtained differ markedly from those that would be obtained in transport simulations using constant Kd, Langmuir or Freundlich sorption models. When possible, simulation results (breakthrough curves) are fitted to a constant Kdadvection–dispersion transport model and compared. Functional differences often are great enough that they prevent a meaningful fit of the simulation results with a constant Kd (or even a Langmuir or Freundlich) model, even in the case of Np, a weakly sorbed radionuclide under the simulation conditions. Functional behaviors that cannot be fit include concentration trend reversals and radionuclide desorption spikes. Other simulation results are fit successfully but the fitted parameters (Kd and dispersivity) vary significantly depending on simulation conditions (e.g. “infiltration” vs. “cleanup” conditions). Notably, an increase in the variance of the specified sorption capacities results in a marked increase in the dispersion of the radionuclides.
The results presented have implications for the simulation of radionuclide migration in performance assessments of nuclear waste-disposal sites, for the future monitoring of those sites, and more generally for modeling contaminant transport in ground-water environments.
","language":"English","publisher":"Elsevier","doi":"10.1016/S0098-3004(03)00009-8","issn":"00983004","usgsCitation":"Glynn, P.D., 2003, Modeling Np and Pu transport with a surface complexation model and spatially variant sorption capacities: Implications for reactive transport modeling and performance assessments of nuclear waste disposal sites: Computers & Geosciences, v. 29, no. 3, p. 331-349, https://doi.org/10.1016/S0098-3004(03)00009-8.","productDescription":"19 p.","startPage":"331","endPage":"349","costCenters":[{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":235008,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":208915,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/S0098-3004(03)00009-8"}],"volume":"29","issue":"3","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a5bcae4b0c8380cd6f7e0","contributors":{"authors":[{"text":"Glynn, P. D.","contributorId":7008,"corporation":false,"usgs":true,"family":"Glynn","given":"P.","email":"","middleInitial":"D.","affiliations":[],"preferred":false,"id":406640,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70025768,"text":"70025768 - 2003 - Kinetic dissolution of carbonates and Mn oxides in acidic water: Measurement of in situ field rates and reactive transport modeling","interactions":[],"lastModifiedDate":"2018-11-16T10:59:56","indexId":"70025768","displayToPublicDate":"2003-01-01T00:00:00","publicationYear":"2003","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":835,"text":"Applied Geochemistry","active":true,"publicationSubtype":{"id":10}},"title":"Kinetic dissolution of carbonates and Mn oxides in acidic water: Measurement of in situ field rates and reactive transport modeling","docAbstract":"The kinetics of carbonate and Mn oxide dissolution under acidic conditions were examined through the in situ exposure of pure phase samples to acidic ground water in Pinal Creek Basin, Arizona. The average long-term calculated in situ dissolution rates for calcite and dolomite were 1.65??10-7 and 3.64??10-10 mmol/(cm2 s), respectively, which were about 3 orders of magnitude slower than rates derived in laboratory experiments by other investigators. Application of both in situ and lab-derived calcite and dolomite dissolution rates to equilibrium reactive transport simulations of a column experiment did not improve the fit to measured outflow chemistry: at the spatial and temporal scales of the column experiment, the use of an equilibrium model adequately simulated carbonate dissolution in the column. Pyrolusite (MnO2) exposed to acidic ground water for 595 days increased slightly in weight despite thermodynamic conditions that favored dissolution. This result might be related to a recent finding by another investigator that the reductive dissolution of pyrolusite is accompanied by the precipitation of a mixed Mn-Fe oxide species. In PHREEQC reactive transport simulations, the incorporation of Mn kinetics improved the fit between observed and simulated behavior at the column and field scales, although the column-fitted rate for Mn-oxide dissolution was about 4 orders of magnitude greater than the field-fitted rate. Remaining differences between observed and simulated contaminant transport trends at the Pinal Creek site were likely related to factors other than the Mn oxide dissolution rate, such as the concentration of Fe oxide surface sites available for adsorption, the effects of competition among dissolved species for available surface sites, or reactions not included in the model.","language":"English","publisher":"Elsevier","doi":"10.1016/S0883-2927(03)00010-6","issn":"08832927","usgsCitation":"Brown, J.G., and Glynn, P.D., 2003, Kinetic dissolution of carbonates and Mn oxides in acidic water: Measurement of in situ field rates and reactive transport modeling: Applied Geochemistry, v. 18, no. 8, p. 1225-1239, https://doi.org/10.1016/S0883-2927(03)00010-6.","productDescription":"15 p.","startPage":"1225","endPage":"1239","costCenters":[{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":235006,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":208913,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/S0883-2927(03)00010-6"}],"volume":"18","issue":"8","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a40a6e4b0c8380cd64f1f","contributors":{"authors":[{"text":"Brown, J. G.","contributorId":28263,"corporation":false,"usgs":true,"family":"Brown","given":"J.","email":"","middleInitial":"G.","affiliations":[],"preferred":false,"id":406510,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Glynn, P. D.","contributorId":7008,"corporation":false,"usgs":true,"family":"Glynn","given":"P.","email":"","middleInitial":"D.","affiliations":[],"preferred":false,"id":406509,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70025762,"text":"70025762 - 2003 - The site-scale saturated zone flow model for Yucca Mountain: Calibration of different conceptual models and their impact on flow paths","interactions":[],"lastModifiedDate":"2018-09-27T11:28:45","indexId":"70025762","displayToPublicDate":"2003-01-01T00:00:00","publicationYear":"2003","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":"The site-scale saturated zone flow model for Yucca Mountain: Calibration of different conceptual models and their impact on flow paths","docAbstract":"This paper presents several different conceptual models of the Large Hydraulic Gradient (LHG) region north of Yucca Mountain and describes the impact of those models on groundwater flow near the potential high-level repository site. The results are based on a numerical model of site-scale saturated zone beneath Yucca Mountain. This model is used for performance assessment predictions of radionuclide transport and to guide future data collection and modeling activities. The numerical model is calibrated by matching available water level measurements using parameter estimation techniques, along with more informal comparisons of the model to hydrologic and geochemical information. The model software (hydrologic simulation code FEHM and parameter estimation software PEST) and model setup allows for efficient calibration of multiple conceptual models. Until now, the Large Hydraulic Gradient has been simulated using a low-permeability, east–west oriented feature, even though direct evidence for this feature is lacking. In addition to this model, we investigate and calibrate three additional conceptual models of the Large Hydraulic Gradient, all of which are based on a presumed zone of hydrothermal chemical alteration north of Yucca Mountain. After examining the heads and permeabilities obtained from the calibrated models, we present particle pathways from the potential repository that record differences in the predicted groundwater flow regime. The results show that Large Hydraulic Gradient can be represented with the alternate conceptual models that include the hydrothermally altered zone. The predicted pathways are mildly sensitive to the choice of the conceptual model and more sensitive to the quality of calibration in the vicinity on the repository. These differences are most likely due to different degrees of fit of model to data, and do not represent important differences in hydrologic conditions for the different conceptual models.
","language":"English","publisher":"Elsevier","doi":"10.1016/S0169-7722(02)00190-0","issn":"01697722","usgsCitation":"Zyvoloski, G., Kwicklis, E., Eddebbarh, A., Arnold, B., Faunt, C., and Robinson, B., 2003, The site-scale saturated zone flow model for Yucca Mountain: Calibration of different conceptual models and their impact on flow paths: Journal of Contaminant Hydrology, v. 62-63, p. 731-750, https://doi.org/10.1016/S0169-7722(02)00190-0.","productDescription":"20 p.","startPage":"731","endPage":"750","costCenters":[{"id":154,"text":"California Water Science Center","active":true,"usgs":true}],"links":[{"id":234901,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":208848,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/S0169-7722(02)00190-0"}],"volume":"62-63","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505bb036e4b08c986b324cda","contributors":{"authors":[{"text":"Zyvoloski, G.","contributorId":51068,"corporation":false,"usgs":true,"family":"Zyvoloski","given":"G.","email":"","affiliations":[],"preferred":false,"id":406482,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Kwicklis, E.","contributorId":69759,"corporation":false,"usgs":true,"family":"Kwicklis","given":"E.","affiliations":[],"preferred":false,"id":406484,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Eddebbarh, A.-A.","contributorId":101425,"corporation":false,"usgs":true,"family":"Eddebbarh","given":"A.-A.","email":"","affiliations":[],"preferred":false,"id":406486,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Arnold, B.","contributorId":32713,"corporation":false,"usgs":true,"family":"Arnold","given":"B.","email":"","affiliations":[],"preferred":false,"id":406481,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Faunt, C. 0000-0001-5659-7529","orcid":"https://orcid.org/0000-0001-5659-7529","contributorId":77714,"corporation":false,"usgs":true,"family":"Faunt","given":"C.","affiliations":[],"preferred":false,"id":406485,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Robinson, B.A.","contributorId":63035,"corporation":false,"usgs":true,"family":"Robinson","given":"B.A.","email":"","affiliations":[],"preferred":false,"id":406483,"contributorType":{"id":1,"text":"Authors"},"rank":6}]}} ,{"id":70025736,"text":"70025736 - 2003 - The saturated zone at Yucca Mountain: An overview of the characterization and assessment of the saturated zone as a barrier to potential radionuclide migration","interactions":[],"lastModifiedDate":"2018-09-18T08:37:39","indexId":"70025736","displayToPublicDate":"2003-01-01T00:00:00","publicationYear":"2003","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":"The saturated zone at Yucca Mountain: An overview of the characterization and assessment of the saturated zone as a barrier to potential radionuclide migration","docAbstract":"The US Department of Energy is pursuing Yucca Mountain, Nevada, for the development of a geologic repository for the disposal of spent nuclear fuel and high-level radioactive waste, if the repository is able to meet applicable radiation protection standards established by the US Nuclear Regulatory Commission and the US Environmental Protection Agency (EPA). Effective performance of such a repository would rely on a number of natural and engineered barriers to isolate radioactive waste from the accessible environment. Groundwater beneath Yucca Mountain is the primary medium through which most radionuclides might move away from the potential repository. The saturated zone (SZ) system is expected to act as a natural barrier to this possible movement of radionuclides both by delaying their transport and by reducing their concentration before they reach the accessible environment. Information obtained from Yucca Mountain Site Characterization Project activities is used to estimate groundwater flow rates through the site-scale SZ flow and transport model area and to constrain general conceptual models of groundwater flow in the site-scale area. The site-scale conceptual model is a synthesis of what is known about flow and transport processes at the scale required for total system performance assessment of the site. This knowledge builds on and is consistent with knowledge that has accumulated at the regional scale but is more detailed because more data are available at the site-scale level. The mathematical basis of the site-scale model and the associated numerical approaches are designed to assist in quantifying the uncertainty in the permeability of rocks in the geologic framework model and to represent accurately the flow and transport processes included in the site-scale conceptual model. Confidence in the results of the mathematical model was obtained by comparing calculated to observed hydraulic heads, estimated to measured permeabilities, and lateral flow rates calculated by the site-scale model to those calculated by the regional-scale flow model. In addition, it was confirmed that the flow paths leaving the region of the potential repository are consistent with those inferred from gradients of measured head and those independently inferred from water-chemistry data. The general approach of the site-scale SZ flow and transport model analysis is to calculate unit breakthrough curves for radionuclides at the interface between the SZ and the biosphere using the three-dimensional site-scale SZ flow and transport model. Uncertainties are explicitly incorporated into the site-scale SZ flow and transport abstractions through key parameters and conceptual models. ?? 2002 Elsevier Science B.V. All rights reserved.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Journal of Contaminant Hydrology","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1016/S0169-7722(02)00154-7","issn":"01697722","usgsCitation":"Eddebbarh, A., Zyvoloski, G., Robinson, B., Kwicklis, E., Reimus, P., Arnold, B., Corbet, T., Kuzio, S., and Faunt, C., 2003, The saturated zone at Yucca Mountain: An overview of the characterization and assessment of the saturated zone as a barrier to potential radionuclide migration: Journal of Contaminant Hydrology, v. 62-63, p. 477-493, https://doi.org/10.1016/S0169-7722(02)00154-7.","startPage":"477","endPage":"493","numberOfPages":"17","costCenters":[{"id":154,"text":"California Water Science Center","active":true,"usgs":true}],"links":[{"id":234532,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":208649,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/S0169-7722(02)00154-7"}],"volume":"62-63","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505bafb4e4b08c986b3249b1","contributors":{"authors":[{"text":"Eddebbarh, A.-A.","contributorId":101425,"corporation":false,"usgs":true,"family":"Eddebbarh","given":"A.-A.","email":"","affiliations":[],"preferred":false,"id":406378,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Zyvoloski, G.A.","contributorId":20123,"corporation":false,"usgs":true,"family":"Zyvoloski","given":"G.A.","email":"","affiliations":[],"preferred":false,"id":406370,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Robinson, B.A.","contributorId":63035,"corporation":false,"usgs":true,"family":"Robinson","given":"B.A.","email":"","affiliations":[],"preferred":false,"id":406372,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Kwicklis, E. M.","contributorId":86377,"corporation":false,"usgs":true,"family":"Kwicklis","given":"E. M.","affiliations":[],"preferred":false,"id":406375,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Reimus, P.W.","contributorId":91266,"corporation":false,"usgs":true,"family":"Reimus","given":"P.W.","email":"","affiliations":[],"preferred":false,"id":406377,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Arnold, B.W.","contributorId":77335,"corporation":false,"usgs":true,"family":"Arnold","given":"B.W.","email":"","affiliations":[],"preferred":false,"id":406373,"contributorType":{"id":1,"text":"Authors"},"rank":6},{"text":"Corbet, T.","contributorId":48361,"corporation":false,"usgs":true,"family":"Corbet","given":"T.","email":"","affiliations":[],"preferred":false,"id":406371,"contributorType":{"id":1,"text":"Authors"},"rank":7},{"text":"Kuzio, S.P.","contributorId":86539,"corporation":false,"usgs":true,"family":"Kuzio","given":"S.P.","email":"","affiliations":[],"preferred":false,"id":406376,"contributorType":{"id":1,"text":"Authors"},"rank":8},{"text":"Faunt, C. 0000-0001-5659-7529","orcid":"https://orcid.org/0000-0001-5659-7529","contributorId":77714,"corporation":false,"usgs":true,"family":"Faunt","given":"C.","affiliations":[],"preferred":false,"id":406374,"contributorType":{"id":1,"text":"Authors"},"rank":9}]}} ,{"id":70025708,"text":"70025708 - 2003 - Herbicides and herbicide degradation products in upper midwest agricultural streams during august base-flow conditions","interactions":[],"lastModifiedDate":"2018-11-19T09:55:54","indexId":"70025708","displayToPublicDate":"2003-01-01T00:00:00","publicationYear":"2003","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2262,"text":"Journal of Environmental Quality","active":true,"publicationSubtype":{"id":10}},"title":"Herbicides and herbicide degradation products in upper midwest agricultural streams during august base-flow conditions","docAbstract":"Herbicide concentrations in streams of the U.S. Midwest have been shown to decrease through the growing season due to a variety of chemical and physical factors. The occurrence of herbicide degradation products at the end of the growing season is not well known. This study was conducted to document the occurrence of commonly used herbicides and their degradation products in Illinois, Iowa, and Minnesota streams during base-flow conditions in August 1997. Atrazine, the most frequently detected herbicide (94%), was present at relatively low concentrations (median 0.17 μg L−1). Metolachlor was detected in 59% and cyanazine in 37% of the samples. Seven of nine compounds detected in more than 50% of the samples were degradation products. The total concentration of the degradation products (median of 4.4 μg L−1) was significantly greater than the total concentration of parent compounds (median of 0.26 μg L−1). Atrazine compounds were present less frequently and in significantly smaller concentrations in streams draining watersheds with soils developed on less permeable tills than in watersheds with soils developed on more permeable loess. The detection and concentration of triazine compounds was negatively correlated with antecedent rainfall (April–July). In contrast, acetanalide compounds were positively correlated with antecedant rainfall in late spring and early summer that may transport the acetanalide degradates into ground water and subsequently into nearby streams. The distribution of atrazine degradation products suggests regional differences in atrazine degradation processes.
","language":"English","publisher":"ACSESS","doi":"10.2134/jeq2003.1025","issn":"00472425","usgsCitation":"Kalkhoff, S., Lee, K.E., Porter, S.D., Terrio, P.J., and Thurman, E., 2003, Herbicides and herbicide degradation products in upper midwest agricultural streams during august base-flow conditions: Journal of Environmental Quality, v. 32, no. 3, p. 1025-1035, https://doi.org/10.2134/jeq2003.1025.","productDescription":"11 p.","startPage":"1025","endPage":"1035","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":234633,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","otherGeospatial":"Midwest region","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -95.16357421875,\n 45.767522962149904\n ],\n [\n -96.17431640625,\n 46.830133640447386\n ],\n [\n -96.591796875,\n 46.63435070293566\n ],\n [\n -96.65771484375,\n 46.08847179577592\n ],\n [\n -97.5146484375,\n 45.81348649679971\n ],\n [\n -98.19580078125,\n 45.78284835197676\n ],\n [\n -98.10791015625,\n 45.182036837015886\n ],\n [\n -97.49267578125,\n 44.19795903948531\n ],\n [\n -95.49316406249999,\n 43.67581809328341\n ],\n [\n -95.11962890625,\n 43.34116005412307\n ],\n [\n -94.1748046875,\n 42.569264372193864\n ],\n [\n -93.66943359374999,\n 41.60722821271717\n ],\n [\n -91.845703125,\n 40.763901280945866\n ],\n [\n -91.2744140625,\n 40.64730356252251\n ],\n [\n -90.81298828125,\n 39.57182223734374\n ],\n [\n -90.5712890625,\n 39.14710270770074\n ],\n [\n -90.41748046874999,\n 38.565347844885466\n ],\n [\n -89.296875,\n 38.53097889440026\n ],\n [\n -88.3740234375,\n 39.436192999314095\n ],\n [\n -88.0224609375,\n 40.26276066437183\n ],\n [\n -88.330078125,\n 40.66397287638688\n ],\n [\n -89.1650390625,\n 41.261291493919856\n ],\n [\n -89.6044921875,\n 41.07935114946899\n ],\n [\n -90.46142578125,\n 40.111688665595956\n ],\n [\n -90.9228515625,\n 40.48038142908172\n ],\n [\n -90.85693359375,\n 40.94671366508002\n ],\n [\n -90.966796875,\n 41.244772343082076\n ],\n [\n -90.04394531249999,\n 41.65649719441145\n ],\n [\n -90.15380859375,\n 42.114523952464246\n ],\n [\n -91.03271484375,\n 41.96765920367816\n ],\n [\n -92.10937499999999,\n 42.68243539838623\n ],\n [\n -92.70263671874999,\n 43.43696596521823\n ],\n [\n -93.22998046875,\n 44.02442151965934\n ],\n [\n -93.603515625,\n 44.213709909702054\n ],\n [\n -94.10888671875,\n 44.26093725039923\n ],\n [\n -93.36181640625,\n 44.793530904744074\n ],\n [\n -93.18603515624999,\n 44.99588261816546\n ],\n [\n -93.91113281249999,\n 45.19752230305685\n ],\n [\n -94.72412109375,\n 45.120052841530544\n ],\n [\n -95.3173828125,\n 45.22848059584359\n ],\n [\n -95.16357421875,\n 45.767522962149904\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"32","issue":"3","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a306ae4b0c8380cd5d619","contributors":{"authors":[{"text":"Kalkhoff, S. J.","contributorId":28967,"corporation":false,"usgs":true,"family":"Kalkhoff","given":"S. J.","affiliations":[],"preferred":false,"id":406257,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Lee, K. E.","contributorId":100014,"corporation":false,"usgs":true,"family":"Lee","given":"K.","email":"","middleInitial":"E.","affiliations":[],"preferred":false,"id":406258,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Porter, S. D.","contributorId":8882,"corporation":false,"usgs":true,"family":"Porter","given":"S.","email":"","middleInitial":"D.","affiliations":[],"preferred":false,"id":406255,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Terrio, P. J.","contributorId":11645,"corporation":false,"usgs":true,"family":"Terrio","given":"P.","email":"","middleInitial":"J.","affiliations":[],"preferred":false,"id":406256,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Thurman, E.M.","contributorId":102864,"corporation":false,"usgs":true,"family":"Thurman","given":"E.M.","affiliations":[],"preferred":false,"id":406259,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}} ,{"id":70025693,"text":"70025693 - 2003 - Using noble gases to investigate mountain-front recharge","interactions":[],"lastModifiedDate":"2012-03-12T17:20:31","indexId":"70025693","displayToPublicDate":"2003-01-01T00:00:00","publicationYear":"2003","noYear":false,"publicationType":{"id":24,"text":"Conference Paper"},"publicationSubtype":{"id":19,"text":"Conference Paper"},"title":"Using noble gases to investigate mountain-front recharge","docAbstract":"Mountain-front recharge is a major component of recharge to inter-mountain basin-fill aquifers. The two components of mountain-front recharge are (1) subsurface inflow from the mountain block (subsurface inflow), and (2) infiltration from perennial and ephemeral streams near the mountain front (stream seepage). The magnitude of subsurface inflow is of central importance in source protection planning for basin-fill aquifers and in some water rights disputes, yet existing estimates carry large uncertainties. Stable isotope ratios can indicate the magnitude of mountain-front recharge relative to other components, but are generally incapable of distinguishing subsurface inflow from stream seepage. Noble gases provide an effective tool for determining the relative significance of subsurface inflow, specifically. Dissolved noble gas concentrations allow for the determination of recharge temperature, which is correlated with recharge elevation. The nature of this correlation cannot be assumed, however, and must be derived for the study area. The method is applied to the Salt Lake Valley Principal Aquifer in northern Utah to demonstrate its utility. Samples from 16 springs and mine tunnels in the adjacent Wasatch Mountains indicate that recharge temperature decreases with elevation at about the same rate as the mean annual air temperature, but is on average about 2??C cooler. Samples from 27 valley production wells yield recharge elevations ranging from the valley elevation (about 1500 m) to mid-mountain elevation (about 2500 m). Only six of the wells have recharge elevations less than 1800 m. Recharge elevations consistently greater than 2000 m in the southeastern part of the basin indicate that subsurface inflow constitutes most of the total recharge in this area. ?? 2003 Published by Elsevier Science B.V.","largerWorkTitle":"Journal of Hydrology","language":"English","doi":"10.1016/S0022-1694(03)00043-X","issn":"00221694","usgsCitation":"Manning, A.H., and Solomon, D.K., 2003, Using noble gases to investigate mountain-front recharge, in Journal of Hydrology, v. 275, no. 3-4, p. 194-207, https://doi.org/10.1016/S0022-1694(03)00043-X.","startPage":"194","endPage":"207","numberOfPages":"14","costCenters":[],"links":[{"id":208909,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/S0022-1694(03)00043-X"},{"id":235002,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"275","issue":"3-4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505bc083e4b08c986b32a17d","contributors":{"authors":[{"text":"Manning, A. H.","contributorId":26491,"corporation":false,"usgs":true,"family":"Manning","given":"A.","email":"","middleInitial":"H.","affiliations":[],"preferred":false,"id":406195,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Solomon, D. K.","contributorId":98324,"corporation":false,"usgs":false,"family":"Solomon","given":"D.","email":"","middleInitial":"K.","affiliations":[],"preferred":false,"id":406196,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70025651,"text":"70025651 - 2003 - Hydrological alteration along the Missouri River Basin: A time series approach","interactions":[],"lastModifiedDate":"2012-03-12T17:20:31","indexId":"70025651","displayToPublicDate":"2003-01-01T00:00:00","publicationYear":"2003","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":873,"text":"Aquatic Sciences","active":true,"publicationSubtype":{"id":10}},"title":"Hydrological alteration along the Missouri River Basin: A time series approach","docAbstract":"Human alteration of large rivers is common-place, often resulting in significant changes in flow characteristics. We used a time series approach to examine daily mean flow data from locations throughout the main-stem Missouri River. Data from a pre-alteration period (1925-1948) were compared with a post-alteration period (1967-1996), with separate analyses conducted using either data from the entire year or restricted to the spring fish spawning period (1 April-30 June). Daily mean flows were significantly higher during the post-alteration period at all locations. Flow variability was markedly reduced during the post-alteration period as a probable result of flow regulation and climatological shifts. Daily mean flow during the spring fish spawning period was significantly lower during the post-alteration period at the most highly altered locations in the middle portion of the river, but unchanged at the least altered locations in the upper and lower portions of the river. Our data also corroborate other analyses, using alternate statistical approaches, that suggest similar changes to the Missouri River system. Our results suggest human alterations on the Missouri River, particularly in the middle portion most strongly affected by impoundments and channelization, have resulted in changes to the natural flow regime.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Aquatic Sciences","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1007/s000270300005","issn":"10151621","usgsCitation":"Pegg, M., Pierce, C., and Roy, A., 2003, Hydrological alteration along the Missouri River Basin: A time series approach: Aquatic Sciences, v. 65, no. 1, p. 63-72, https://doi.org/10.1007/s000270300005.","startPage":"63","endPage":"72","numberOfPages":"10","costCenters":[],"links":[{"id":478480,"rank":10000,"type":{"id":41,"text":"Open Access External Repository Page"},"url":"https://lib.dr.iastate.edu/nrem_pubs/125","text":"External Repository"},{"id":208825,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1007/s000270300005"},{"id":234856,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"65","issue":"1","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a36a8e4b0c8380cd608b9","contributors":{"authors":[{"text":"Pegg, M.A.","contributorId":46469,"corporation":false,"usgs":true,"family":"Pegg","given":"M.A.","affiliations":[],"preferred":false,"id":406024,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Pierce, C.L. 0000-0001-5088-5431","orcid":"https://orcid.org/0000-0001-5088-5431","contributorId":93606,"corporation":false,"usgs":true,"family":"Pierce","given":"C.L.","affiliations":[],"preferred":false,"id":406025,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Roy, A.","contributorId":25679,"corporation":false,"usgs":true,"family":"Roy","given":"A.","email":"","affiliations":[],"preferred":false,"id":406023,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70025644,"text":"70025644 - 2003 - An approach for mapping large-area impervious surfaces: Synergistic use of Landsat-7 ETM+ and high spatial resolution imagery","interactions":[],"lastModifiedDate":"2018-02-23T13:34:18","indexId":"70025644","displayToPublicDate":"2003-01-01T00:00:00","publicationYear":"2003","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1175,"text":"Canadian Journal of Remote Sensing","active":true,"publicationSubtype":{"id":10}},"title":"An approach for mapping large-area impervious surfaces: Synergistic use of Landsat-7 ETM+ and high spatial resolution imagery","docAbstract":"A wide range of urban ecosystem studies, including urban hydrology, urban climate, land use planning, and resource management, require current and accurate geospatial data of urban impervious surfaces. We developed an approach to quantify urban impervious surfaces as a continuous variable by using multisensor and multisource datasets. Subpixel percent impervious surfaces at 30-m resolution were mapped using a regression tree model. The utility, practicality, and affordability of the proposed method for large-area imperviousness mapping were tested over three spatial scales (Sioux Falls, South Dakota, Richmond, Virginia, and the Chesapeake Bay areas of the United States). Average error of predicted versus actual percent impervious surface ranged from 8.8 to 11.4%, with correlation coefficients from 0.82 to 0.91. The approach is being implemented to map impervious surfaces for the entire United States as one of the major components of the circa 2000 national land cover database.
","language":"English","publisher":"Canadian Aeronautics and Space Institute","doi":"10.5589/m02-098","issn":"07038992","usgsCitation":"Yang, L., Huang, C., Homer, C.G., Wylie, B.K., and Coan, M., 2003, An approach for mapping large-area impervious surfaces: Synergistic use of Landsat-7 ETM+ and high spatial resolution imagery: Canadian Journal of Remote Sensing, v. 29, no. 2, p. 230-240, https://doi.org/10.5589/m02-098.","productDescription":"11 p.","startPage":"230","endPage":"240","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[{"id":222,"text":"Earth Resources Observation and Science (EROS) Center","active":true,"usgs":true}],"links":[{"id":234740,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"29","issue":"2","noUsgsAuthors":false,"publicationDate":"2014-06-02","publicationStatus":"PW","scienceBaseUri":"5059ea0ae4b0c8380cd485c9","contributors":{"authors":[{"text":"Yang, Limin 0000-0002-2843-6944 lyang@usgs.gov","orcid":"https://orcid.org/0000-0002-2843-6944","contributorId":4305,"corporation":false,"usgs":true,"family":"Yang","given":"Limin","email":"lyang@usgs.gov","affiliations":[{"id":223,"text":"Earth Resources Observation and Science (EROS) Center (Geography)","active":false,"usgs":true}],"preferred":true,"id":405997,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Huang, Chengquan 0000-0003-0055-9798","orcid":"https://orcid.org/0000-0003-0055-9798","contributorId":198972,"corporation":false,"usgs":false,"family":"Huang","given":"Chengquan","email":"","affiliations":[{"id":7261,"text":"Department of Geographical Sciences, University of Maryland, College Park, MD, 20742","active":true,"usgs":false}],"preferred":false,"id":406001,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Homer, Collin G. 0000-0003-4755-8135 homer@usgs.gov","orcid":"https://orcid.org/0000-0003-4755-8135","contributorId":2262,"corporation":false,"usgs":true,"family":"Homer","given":"Collin","email":"homer@usgs.gov","middleInitial":"G.","affiliations":[{"id":223,"text":"Earth Resources Observation and Science (EROS) Center (Geography)","active":false,"usgs":true},{"id":222,"text":"Earth Resources Observation and Science (EROS) Center","active":true,"usgs":true}],"preferred":true,"id":405999,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Wylie, Bruce K. 0000-0002-7374-1083 wylie@usgs.gov","orcid":"https://orcid.org/0000-0002-7374-1083","contributorId":750,"corporation":false,"usgs":true,"family":"Wylie","given":"Bruce","email":"wylie@usgs.gov","middleInitial":"K.","affiliations":[{"id":223,"text":"Earth Resources Observation and Science (EROS) Center (Geography)","active":false,"usgs":true},{"id":222,"text":"Earth Resources Observation and Science (EROS) Center","active":true,"usgs":true}],"preferred":true,"id":405998,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Coan, Michael mcoan@usgs.gov","contributorId":5398,"corporation":false,"usgs":true,"family":"Coan","given":"Michael","email":"mcoan@usgs.gov","affiliations":[],"preferred":true,"id":406000,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}} ,{"id":70025607,"text":"70025607 - 2003 - Benthic sulfate reduction along the Chesapeake Bay central channel. II. Temporal controls","interactions":[],"lastModifiedDate":"2018-11-19T08:20:19","indexId":"70025607","displayToPublicDate":"2003-01-01T00:00:00","publicationYear":"2003","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2663,"text":"Marine Ecology Progress Series","active":true,"publicationSubtype":{"id":10}},"title":"Benthic sulfate reduction along the Chesapeake Bay central channel. II. Temporal controls","docAbstract":"Seasonal and interannual controls of benthic sulfate reduction (SR) were examined at 3 sites (upper [UB], mid- [MB] and lower [LB] bay) along the Chesapeake Bay central channel, from early spring through fall, for 6 yr (1989 to 1994). The combined influences of temperature, sulfate, organic loading and bioturbation affected seasonal SR rates differently in the 3 regions. Consistently low SR rates at UB resulted from low overlying-water sulfate concentrations and the dominance of refractory organic terrestrial material. Combined seasonal variation in temperature and sulfate accounted for 50% of the annual variability in 0 to 2 cm depth interval SR rates, while sediment organic content had no significant seasonal influence. In contrast, MB and LB sites had high rates of SR fostered by high levels of overlying water SO42- and organic input dominated by labile phytoplankton detritus. New organic loading (measured as chl a) stimulated 0 to 2 cm SR during spring at both sites. Combined organic quantity (as particulate C and/or N) and temperature accounted for > 75% of the variability in 0 to 2 cm SR at MB during spring and fall. Molecular diffusion supplied 25 to 45% of the SO 42- needed to fuel 0 to 12 cm depth interval SR at MB, with the balance presumably supplied by S-recycling. Interannual differences in summertime SR rates were linked to the extent of freshwater flow during spring, with high-flow years associated with high SR rates at UB and MB, and low rates at LB. The negative trend between benthic SR and river flow at LB may result from the up-estuary transport of senescing organic matter in bottom water, which increases in the lower reach of the estuary with increasing freshwater inflow.","language":"English","publisher":"Inter Res","doi":"10.3354/meps260055","issn":"01718630","usgsCitation":"Marvin-DiPasquale, M., Boynton, W., and Capone, D., 2003, Benthic sulfate reduction along the Chesapeake Bay central channel. II. Temporal controls: Marine Ecology Progress Series, v. 260, p. 55-70, https://doi.org/10.3354/meps260055.","productDescription":"16 p.","startPage":"55","endPage":"70","costCenters":[{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":478498,"rank":1,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.3354/meps260055","text":"Publisher Index Page"},{"id":235943,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","otherGeospatial":"Chesapeake Bay","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -77.1734619140625,\n 36.90597988519294\n ],\n [\n -75.43212890625,\n 36.90597988519294\n ],\n [\n -75.43212890625,\n 39.6606850221923\n ],\n [\n -77.1734619140625,\n 39.6606850221923\n ],\n [\n -77.1734619140625,\n 36.90597988519294\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"260","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059f0c2e4b0c8380cd4a8d4","contributors":{"authors":[{"text":"Marvin-DiPasquale, M. C.","contributorId":6605,"corporation":false,"usgs":true,"family":"Marvin-DiPasquale","given":"M. C.","affiliations":[],"preferred":false,"id":405841,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Boynton, W.R.","contributorId":77679,"corporation":false,"usgs":true,"family":"Boynton","given":"W.R.","email":"","affiliations":[],"preferred":false,"id":405842,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Capone, D.G.","contributorId":105876,"corporation":false,"usgs":true,"family":"Capone","given":"D.G.","email":"","affiliations":[],"preferred":false,"id":405843,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70025604,"text":"70025604 - 2003 - Rivers, runoff, and reefs","interactions":[],"lastModifiedDate":"2012-03-12T17:20:26","indexId":"70025604","displayToPublicDate":"2003-01-01T00:00:00","publicationYear":"2003","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1844,"text":"Global and Planetary Change","active":true,"publicationSubtype":{"id":10}},"title":"Rivers, runoff, and reefs","docAbstract":"The role of terrigenous sediment in controlling the occurrence of coral reef ecosystems is qualitatively understood and has been studied at local scales, but has not been systematically evaluated on a global-to-regional scale. Current concerns about degradation of reef environments and alteration of the hydrologic and sediment cycles place the issue at a focal point of multiple environmental concerns. We use a geospatial clustering of a coastal zone database of river and local runoff identified with 0.5?? grid cells to identify areas of high potential runoff effects, and combine this with a database of reported coral reef locations. Coastal cells with high runoff values are much less likely to contain reefs than low runoff cells and GIS buffer analysis demonstrates that this inhibition extends to offshore ocean cells as well. This analysis does not uniquely define the effects of sediment, since salinity, nutrients, and contaminants are potentially confounding variables also associated with runoff. However, sediment effects are likely to be a major factor and a basis is provided for extending the study to higher resolution with more specific variables. ?? 2003 Elsevier B.V. All rights reserved.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Global and Planetary Change","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1016/S0921-8181(03)00024-9","issn":"09218181","usgsCitation":"McLaughlin, C., Smith, C., Buddemeier, R., Bartley, J., and Maxwell, B., 2003, Rivers, runoff, and reefs: Global and Planetary Change, v. 39, no. 1-2, p. 191-199, https://doi.org/10.1016/S0921-8181(03)00024-9.","startPage":"191","endPage":"199","numberOfPages":"9","costCenters":[],"links":[{"id":209434,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/S0921-8181(03)00024-9"},{"id":235872,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"39","issue":"1-2","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505aadc4e4b0c8380cd86f82","contributors":{"authors":[{"text":"McLaughlin, C.J.","contributorId":25829,"corporation":false,"usgs":true,"family":"McLaughlin","given":"C.J.","email":"","affiliations":[],"preferred":false,"id":405828,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Smith, C.A.","contributorId":10432,"corporation":false,"usgs":true,"family":"Smith","given":"C.A.","email":"","affiliations":[],"preferred":false,"id":405827,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Buddemeier, R. W.","contributorId":86492,"corporation":false,"usgs":true,"family":"Buddemeier","given":"R. W.","affiliations":[],"preferred":false,"id":405829,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Bartley, J.D.","contributorId":88533,"corporation":false,"usgs":true,"family":"Bartley","given":"J.D.","email":"","affiliations":[],"preferred":false,"id":405830,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Maxwell, B.A.","contributorId":7516,"corporation":false,"usgs":true,"family":"Maxwell","given":"B.A.","email":"","affiliations":[],"preferred":false,"id":405826,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}} ,{"id":70025591,"text":"70025591 - 2003 - Density and distribution of water boatmen and brine shrimp at a major shorebird wintering area in Puerto Rico","interactions":[],"lastModifiedDate":"2012-03-12T17:20:27","indexId":"70025591","displayToPublicDate":"2003-01-01T00:00:00","publicationYear":"2003","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3751,"text":"Wetlands Ecology and Management","active":true,"publicationSubtype":{"id":10}},"title":"Density and distribution of water boatmen and brine shrimp at a major shorebird wintering area in Puerto Rico","docAbstract":"The Cabo Rojo salt flats are an important wintering area for migratory shorebirds. Their quality is intimately related to prey availability, as prey are needed to meet energetic requirements. Understanding prey dynamics is, therefore, a key element of shorebird conservation plans. To this end, we monitored the density and distribution of water-boatmen (Trichocorixa spp.) and brine shrimp (Artemia spp.) in relation to water salinity from September to November of 1994 and 1995. Salinity ranged from 4 to 292 ppt, and gradients were related to hydrological alterations (e.g., salt extraction) and connection to the ocean. Brine shrimp were restricted to areas of highest salinity (??? 106 ppt), whereas water-boatmen to areas of lowest salinity (< 65 ppt). We used aquaria experiments to discern potential mechanisms influencing density and distribution of water boatmen. We focused on this species because its caloric value is similar to the brine shrimp's, but it occurs in areas of lower salinity where shorebirds are less prone to hyperosmotic stress. We hypothesized that areas devoid of water boatmen exceeded their tolerance limit, and that these limits could hamper survival as individuals move among areas. Experiments showed that an increase of 8.5 ?? 2.1 ppt, when the base salinity was 40 ppt, induced a 50% mortality rate. From a base salinity of 55 ppt, median survival time decreased curvilinearly across salinity concentrations of 65 to 195 ppt. Median survival was lowest > 100 ppt. Lowering water salinity did not result in osmolal related mortality. Results underscored the sensitivity of water boatmen to high salinity, particularly when the difference in salinity between the 'source' and 'destination' localities widened. Water boatmen density increased in one lagoon as salinity decreased from 65 to 47 ppt. On the basis of our experiments, local adult survivorship improved and immigration and subsequent survival of adults, if any, was not hindered. The density of nymphs also suggested that hatching occurred concurrently. The foraging value of the salt flats can be enhanced by maintaining salinity at < 65 ppt in selected management units and minimizing differences in salinity concentrations among them.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Wetlands Ecology and Management","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1023/B:WETL.0000005542.46697.1d","issn":"09234861","usgsCitation":"Tripp, K., and Collazo, J., 2003, Density and distribution of water boatmen and brine shrimp at a major shorebird wintering area in Puerto Rico: Wetlands Ecology and Management, v. 11, no. 5, p. 331-341, https://doi.org/10.1023/B:WETL.0000005542.46697.1d.","startPage":"331","endPage":"341","numberOfPages":"11","costCenters":[],"links":[{"id":209349,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1023/B:WETL.0000005542.46697.1d"},{"id":235677,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"11","issue":"5","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059fe9fe4b0c8380cd4ee2b","contributors":{"authors":[{"text":"Tripp, K.J.","contributorId":74933,"corporation":false,"usgs":true,"family":"Tripp","given":"K.J.","email":"","affiliations":[],"preferred":false,"id":405778,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Collazo, J.A.","contributorId":35039,"corporation":false,"usgs":true,"family":"Collazo","given":"J.A.","affiliations":[],"preferred":false,"id":405777,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70025513,"text":"70025513 - 2003 - Summary of recent research in Long Valley Caldera, California","interactions":[],"lastModifiedDate":"2012-03-12T17:21:00","indexId":"70025513","displayToPublicDate":"2003-01-01T00:00:00","publicationYear":"2003","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2499,"text":"Journal of Volcanology and Geothermal Research","active":true,"publicationSubtype":{"id":10}},"title":"Summary of recent research in Long Valley Caldera, California","docAbstract":"Since 1978, volcanic unrest in the form of earthquakes and ground deformation has persisted in the Long Valley caldera and adjacent parts of the Sierra Nevada. The papers in this special volume focus on periods of accelerated seismicity and deformation in 1980, 1983, 1989-1990, and 1997-1998 to delineate relations between geologic, tectonic, and hydrologic processes. The results distinguish between earthquake sequences that result from relaxation of existing stress accumulation through brittle failure and those in which brittle failure is driven by active intrusion. They also indicate that in addition to a relatively shallow (7-10-km) source beneath the resurgent dome, there exists a deeper (???15-km) source beneath the south moat. Analysis of microgravimety and deformation data indicates that the composition of the shallower source may involve a combination of silicic magma and hydrothermal fluid. Pressure and temperature fluctuations in wells have accompanied periods of crustal unrest, and additional pressure and temperature changes accompanying ongoing geothermal power production have resulted in land subsidence. The completion in 1998 of a 3000-m-deep drill hole on the resurgent dome has provided useful information on present and past periods of circulation of water at temperatures of 100-200??C within the crystalline basement rocks that underlie the post-caldera volcanics. The well is now being converted to a permanent geophysical monitoring station. ?? 2003 Elsevier B.V. All rights reserved.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Journal of Volcanology and Geothermal Research","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1016/S0377-0273(03)00168-9","issn":"03770273","usgsCitation":"Sorey, M., McConnell, V., and Roeloffs, E., 2003, Summary of recent research in Long Valley Caldera, California: Journal of Volcanology and Geothermal Research, v. 127, no. 3-4, p. 165-173, https://doi.org/10.1016/S0377-0273(03)00168-9.","startPage":"165","endPage":"173","numberOfPages":"9","costCenters":[],"links":[{"id":209544,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/S0377-0273(03)00168-9"},{"id":236123,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"127","issue":"3-4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505b9ea6e4b08c986b31e048","contributors":{"authors":[{"text":"Sorey, M.L.","contributorId":73185,"corporation":false,"usgs":true,"family":"Sorey","given":"M.L.","affiliations":[],"preferred":false,"id":405479,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"McConnell, V.S.","contributorId":39975,"corporation":false,"usgs":true,"family":"McConnell","given":"V.S.","email":"","affiliations":[],"preferred":false,"id":405478,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Roeloffs, E.","contributorId":21680,"corporation":false,"usgs":true,"family":"Roeloffs","given":"E.","email":"","affiliations":[],"preferred":false,"id":405477,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70025464,"text":"70025464 - 2003 - Changes in the timing of high river flows in New England over the 20th Century","interactions":[],"lastModifiedDate":"2012-03-12T17:20:30","indexId":"70025464","displayToPublicDate":"2003-01-01T00:00:00","publicationYear":"2003","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":"Changes in the timing of high river flows in New England over the 20th Century","docAbstract":"The annual timing of river flows is a good indicator of climate-related changes, or lack of changes, for rivers with long-term data that drain unregulated basins with stable land use. Changes in the timing of annual winter/spring (January 1 to May 31) and fall (October 1 to December 31) center of volume dates were analyzed for 27 rural, unregulated river gaging stations in New England, USA with an average of 68 years of record. The center of volume date is the date by which half of the total volume of water for a given period of time flows past a river gaging station, and is a measure of the timing of the bulk of flow within the time period. Winter/spring center of volume (WSCV) dates have become significantly earlier (p < 0.1) at all 11 river gaging stations in areas of New England where snowmelt runoff has the most effect on spring river flows. Most of this change has occurred in the last 30 years with dates advancing by 1-2 weeks. WSCV dates were correlated with March through April air temperatures (r = -0.72) and with January precipitation (r = -0.37). Three of 16 river gaging stations in the remainder of New England had significantly earlier WSCV dates. Four out of 27 river gaging stations had significantly earlier fall center of volume dates in New England. Changes in the timing of winter/spring and fall peak flow dates were consistent with the changes in the respective center of volume dates, given the greater variability in the peak flow dates. Changes in the WSCV dates over the last 30 years are consistent with previous studies of New England last-frost dates, lilac bloom dates, lake ice-out dates, and spring air temperatures. This suggests that these New England spring geophysical and biological changes all were caused by a common mechanism, temperature increases.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Journal of Hydrology","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1016/S0022-1694(03)00155-0","issn":"00221694","usgsCitation":"Hodgkins, G., Dudley, R.W., and Huntington, T., 2003, Changes in the timing of high river flows in New England over the 20th Century: Journal of Hydrology, v. 278, no. 1-4, p. 244-252, https://doi.org/10.1016/S0022-1694(03)00155-0.","startPage":"244","endPage":"252","numberOfPages":"9","costCenters":[],"links":[{"id":209445,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/S0022-1694(03)00155-0"},{"id":235899,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"278","issue":"1-4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059f436e4b0c8380cd4bbe2","contributors":{"authors":[{"text":"Hodgkins, G.A.","contributorId":14022,"corporation":false,"usgs":true,"family":"Hodgkins","given":"G.A.","email":"","affiliations":[],"preferred":false,"id":405288,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Dudley, R. W.","contributorId":90780,"corporation":false,"usgs":true,"family":"Dudley","given":"R.","email":"","middleInitial":"W.","affiliations":[],"preferred":false,"id":405290,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Huntington, T.G. 0000-0002-9427-3530","orcid":"https://orcid.org/0000-0002-9427-3530","contributorId":64675,"corporation":false,"usgs":true,"family":"Huntington","given":"T.G.","affiliations":[{"id":466,"text":"New England Water Science Center","active":true,"usgs":true}],"preferred":false,"id":405289,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70025458,"text":"70025458 - 2003 - Data-based comparisons of moments estimators using historical and paleoflood data","interactions":[],"lastModifiedDate":"2012-03-12T17:20:30","indexId":"70025458","displayToPublicDate":"2003-01-01T00:00:00","publicationYear":"2003","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":"Data-based comparisons of moments estimators using historical and paleoflood data","docAbstract":"This paper presents the first systematic comparison, using historical and paleoflood data, of moments-based flood frequency methods. Peak flow estimates were compiled from streamflow-gaging stations with historical and/or paleoflood data at 36 sites located in the United States, Argentina, United Kingdom and China, covering a diverse range of hydrologic conditions. The Expected Moments Algorithm (EMA) and the Bulletin 17B historical weighting procedure (B17H) were compared in terms of goodness of fit using 25 of the data sets. Results from this comparison indicate that EMA is a viable alternative to current B17H procedures from an operational perspective, and performed equal to or better than B17H for the data analyzed. We demonstrate satisfactory EMA performance for the remaining 11 sites with multiple thresholds and binomial censoring, which B17H cannot accommodate. It is shown that the EMA estimator readily incorporates these types of information and the LP-III distribution provided an adequate fit to the data in most cases. The results shown here are consistent with Monte Carlo simulation studies, and demonstrate that EMA is preferred overall to B17H. The Bulletin 17B document could be revised to include an option for EMA as an alternative to the existing historical weighting approach. These results are of practical relevance to hydrologists and water resources managers for applications in floodplain management, design of hydraulic structures, and risk analysis for dams. ?? 2003 Elsevier Science B.V. All rights reserved.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Journal of Hydrology","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1016/S0022-1694(03)00141-0","issn":"00221694","usgsCitation":"England, J., Jarrett, R., and Salas, J., 2003, Data-based comparisons of moments estimators using historical and paleoflood data: Journal of Hydrology, v. 278, no. 1-4, p. 172-196, https://doi.org/10.1016/S0022-1694(03)00141-0.","startPage":"172","endPage":"196","numberOfPages":"25","costCenters":[],"links":[{"id":209409,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/S0022-1694(03)00141-0"},{"id":235823,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"278","issue":"1-4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059fdcfe4b0c8380cd4e95a","contributors":{"authors":[{"text":"England, J.F. Jr.","contributorId":42405,"corporation":false,"usgs":true,"family":"England","given":"J.F.","suffix":"Jr.","email":"","affiliations":[],"preferred":false,"id":405272,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Jarrett, R.D.","contributorId":36551,"corporation":false,"usgs":true,"family":"Jarrett","given":"R.D.","email":"","affiliations":[],"preferred":false,"id":405271,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Salas, J.D.","contributorId":84962,"corporation":false,"usgs":true,"family":"Salas","given":"J.D.","email":"","affiliations":[],"preferred":false,"id":405273,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70025408,"text":"70025408 - 2003 - Binding of mercury(II) to aquatic humic substances: Influence of pH and source of humic substances","interactions":[],"lastModifiedDate":"2018-11-19T08:30:27","indexId":"70025408","displayToPublicDate":"2003-01-01T00:00:00","publicationYear":"2003","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":"Binding of mercury(II) to aquatic humic substances: Influence of pH and source of humic substances","docAbstract":"Conditional distribution coefficients (KDOM‘) for Hg(II) binding to seven dissolved organic matter (DOM) isolates were measured at environmentally relevant ratios of Hg(II) to DOM. The results show that KDOM‘ values for different types of samples (humic acids, fulvic acids, hydrophobic acids) isolated from diverse aquatic environments were all within 1 order of magnitude (1022.5±1.0−1023.5±1.0 L kg-1), suggesting similar Hg(II) binding environments, presumably involving thiol groups, for the different isolates. KDOM‘ values decreased at low pHs (4) compared to values at pH 7, indicating proton competition for the strong Hg(II) binding sites. Chemical modeling of Hg(II)−DOM binding at different pH values was consistent with bidentate binding of Hg(II) by one thiol group (pKa = 10.3) and one other group (pKa = 6.3) in the DOM, which is in agreement with recent results on the structure of Hg(II)−DOM bonds obtained by extended X-ray absorption fine structure spectroscopy (EXAFS).
This paper presents the results of a study on the use of continuous stage data to describe the relation between urban development and three aspects of hydrologic condition that are thought to influence stream ecosystems - overall stage variability, stream flashiness, and the duration of extreme-stage conditions. This relation is examined using data from more than 70 watersheds in three contrasting environmental settings - the humid Northeast (the metropolitan Boston, Massachusetts, area); the very humid Southeast (the metropolitan Birmingham, Alabama, area); and the semiarid West (the metropolitan Salt Lake City, Utah, area). Results from the Birmingham and Boston studies provide evidence linking increased urbanization with stream flashiness. Fragmentation of developed land cover patches appears to ameliorate the effects of urbanization on overall variability and flashiness. There was less success in relating urbanization and streamflow conditions in the Salt Lake City study. A related investigation of six North Carolina sites with long term discharge and stage data indicated that hydrologic condition metrics developed using continuous stage data are comparable to flow based metrics, particularly for stream flashiness measures.
","language":"English","publisher":"Wiley","doi":"10.1111/j.1752-1688.2003.tb04437.x","issn":"1093474X","usgsCitation":"McMahon, G., Bales, J., Coles, J., Giddings, E., and Zappia, H., 2003, Use of stage data to characterize hydrologic conditions in an urbanizing environment: Journal of the American Water Resources Association, v. 39, no. 6, p. 1529-1546, https://doi.org/10.1111/j.1752-1688.2003.tb04437.x.","productDescription":"18 p.","startPage":"1529","endPage":"1546","costCenters":[],"links":[{"id":388290,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"39","issue":"6","noUsgsAuthors":false,"publicationDate":"2007-06-08","publicationStatus":"PW","scienceBaseUri":"505bbf89e4b08c986b329bff","contributors":{"authors":[{"text":"McMahon, G.","contributorId":87263,"corporation":false,"usgs":true,"family":"McMahon","given":"G.","email":"","affiliations":[],"preferred":false,"id":404889,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Bales, J. D.","contributorId":21569,"corporation":false,"usgs":true,"family":"Bales","given":"J. D.","affiliations":[],"preferred":false,"id":404886,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Coles, J.F.","contributorId":80257,"corporation":false,"usgs":true,"family":"Coles","given":"J.F.","affiliations":[],"preferred":false,"id":404888,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Giddings, E.M.P.","contributorId":36348,"corporation":false,"usgs":true,"family":"Giddings","given":"E.M.P.","email":"","affiliations":[],"preferred":false,"id":404887,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Zappia, H.","contributorId":94474,"corporation":false,"usgs":true,"family":"Zappia","given":"H.","affiliations":[],"preferred":false,"id":404890,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}} ]}