Co-precipitation of dissolved organic matter by calcium carbonate in Pyramid Lake, Nevada
Jerry A. Leenheer, Michael M. Reddy
2008, Annals of Environmental Science (2) 11-25
Our previous research has demonstrated that dissolved organic matter (DOM) influences calcium carbonate mineral formation in surface and ground water. To better understand DOM mediation of carbonate precipitation and DOM co-precipitation and/or incorporation with carbonate minerals, we characterized the content and speciation of DOM in carbonate minerals and in the...
Modeling landslide recurrence in Seattle, Washington, USA
Diana Salciarini, Jonathan W. Godt, William Z. Savage, Rex L. Baum, Pietro Conversini
2008, Engineering Geology (102) 227-237
To manage the hazard associated with shallow landslides, decision makers need an understanding of where and when landslides may occur. A variety of approaches have been used to estimate the hazard from shallow, rainfall-triggered landslides, such as empirical rainfall threshold methods or probabilistic methods based on historical records. The wide...
Hydrologic connections and dynamics of water movement in the classical Karst (Kras) aquifer: Evidence from frequent chemical and stable isotope sampling
Daniel H. Doctor
2008, Acta Carsologica (37) 101-123
A review of past researchon the hydrogeology of the Classical Karst (Kras) region and new information obtained from a two-year study using environmental tracers are presented in this paper. The main problems addressed are 1) the sources of water to the Kras aquifer resurgence zone—including the famous Timavo springs—under changing...
Coupled semivariogram uncertainty of hydrogeological and geophysical data on capture zone uncertainty analysis
A. Rahman, F.T.-C. Tsai, C.D. White, C. S. Willson
2008, Journal of Hydrologic Engineering (13) 915-925
This study investigates capture zone uncertainty that relates to the coupled semivariogram uncertainty of hydrogeological and geophysical data. Semivariogram uncertainty is represented by the uncertainty in structural parameters (range, sill, and nugget). We used the beta distribution function to derive the prior distributions of structural parameters. The probability distributions of...
A seepage meter designed for use in flowing water
D.O. Rosenberry
2008, Journal of Hydrology (359) 118-130
Seepage meters provide one of the most direct means to measure exchange of water across the sediment-water interface, but they generally have been unsuitable for use in fluvial settings. Although the seepage bag can be placed inside a rigid container to minimize velocity head concerns, the seepage cylinder installed in...
Geoelectrical inference of mass transfer parameters using temporal moments
Frederick D. Day-Lewis, Kamini Singha
2008, Water Resources Research (44)
We present an approach to infer mass transfer parameters based on (1) an analytical model that relates the temporal moments of mobile and bulk concentration and (2) a bicontinuum modification to Archie's law. Whereas conventional geochemical measurements preferentially sample from the mobile domain, electrical resistivity tomography (ERT) is sensitive to...
Hydrological response to timber harvest in northern Idaho: Implications for channel scour and persistence of salmonids
D. Tonina, C.H. Luce, B. Rieman, J.M. Buffington, P. Goodwin, S.R. Clayton, S. Ali, J.J. Barry, C. Berenbrock
2008, Hydrological Processes (22) 3223-3235
The potential for forest harvest to increase snowmelt rates in maritime snow climates is well recognized. However, questions still exist about the magnitude of peak flow increases in basins larger than 10 km2 and the geomorphic and biological consequences of these changes. In this study, we used observations from two...
Precipitation rates and atmospheric heat transport during the Cenomanian greenhouse warming in North America: Estimates from a stable isotope mass-balance model
David F. Ufnar, Greg A. Ludvigson, L. Gonzalez, D.R. Grocke
2008, Palaeogeography, Palaeoclimatology, Palaeoecology (266) 28-38
Stable isotope mass-balance modeling results of meteoric ??18O values from the Cenomanian Stage of the Cretaceous Western Interior Basin (KWIB) suggest that precipitation and evaporation fluxes were greater than that of the present and significantly different from simulations of Albian KWIB paleohydrology. Sphaerosiderite meteoric ??18O values have been compiled from...
In situ arsenic removal in an alkaline clastic aquifer
A. H. Welch, K.G. Stollenwerk, A.P. Paul, D. K. Maurer, K. J. Halford
2008, Applied Geochemistry (23) 2477-2495
In situ removal of As from ground water used for water supply has been accomplished elsewhere in circum-neutral ground water containing high dissolved Fe(II) concentrations. The objective of this study was to evaluate in situ As ground-water treatment approaches in alkaline ground-water (pH > 8)...
Changes in dissolved organic material determine exposure of stream benthic communities to UV-B radiation and heavy metals: Implications for climate change
W.H. Clements, M.L. Brooks, D.R. Kashian, R.E. Zuellig
2008, Global Change Biology (14) 2201-2214
Changes in regional climate in the Rocky Mountains over the next 100 years are expected to have significant effects on biogeochemical cycles and hydrological processes. In particular, decreased discharge and lower stream depth during summer when ultraviolet radiation (UVR) is the highest combined with greater photo-oxidation of dissolved organic materials...
Landscape complexity and soil moisture variation in south Georgia, USA, for remote sensing applications
M.A. Giraldo, D. Bosch, M. Madden, L. Usery, Craig Kvien
2008, Journal of Hydrology (357) 405-420
This research addressed the temporal and spatial variation of soil moisture (SM) in a heterogeneous landscape. The research objective was to investigate soil moisture variation in eight homogeneous 30 by 30 m plots, similar to the pixel size of a Landsat Thematic Mapper (TM) or Enhanced Thematic Mapper plus (ETM+)...
Spatial dynamics of overbank sedimentation in floodplain systems
Aaron R. Pierce, S.L. King
2008, Geomorphology (100) 256-268
Floodplains provide valuable social and ecological functions, and understanding the rates and patterns of overbank sedimentation is critical for river basin management and rehabilitation. Channelization of alluvial systems throughout the world has altered hydrological and sedimentation processes within floodplain ecosystems. In the loess belt region of the Lower Mississippi Alluvial...
Arsenic(III) fuels anoxygenic photosynthesis in hot spring biofilms from Mono Lake, California
T.R. Kulp, S.E. Hoeft, M. Asao, M.T. Madigan, J.T. Hollibaugh, J.C. Fisher, J.F. Stolz, C.W. Culbertson, L.G. Miller, R.S. Oremland
2008, Science (321) 967-970
Phylogenetic analysis indicates that microbial arsenic metabolism is ancient and probably extends back to the primordial Earth. In microbial biofilms growing on the rock surfaces of anoxic brine pools fed by hot springs containing arsenite and sulfide at high concentrations, we discovered light-dependent oxidation of arsenite [As(III)] to arsenate [As(V)]...
Hydrologic models of modern and fossil geothermal systems in the Great Basin: Genetic implications for epithermal Au-Ag and Carlin-type gold deposits
M. Person, A. Banerjee, A. Hofstra, D. Sweetkind, Y. Gao
2008, Geosphere (4) 888-917
The Great Basin region in the western United States contains active geothermal systems, large epithermal Au-Ag deposits, and world-class Carlin-type gold deposits. Temperature profiles, fluid inclusion studies, and isotopic evidence suggest that modern and fossil hydrothermal systems associated with gold mineralization share many common features, including the absence of a...
Spatial patterns of simulated transpiration response to climate variability in a snow dominated mountain ecosystem
L. Christensen, C.L. Tague, Jill Baron
2008, Hydrological Processes (22) 3576-3588
Transpiration is an important component of soil water storage and stream-flow and is linked with ecosystem productivity, species distribution, and ecosystem health. In mountain environments, complex topography creates heterogeneity in key controls on transpiration as well as logistical challenges for collecting representative measurements. In these settings, ecosystem models can be...
Assessing the contribution of wetlands and subsided islands to dissolved organic matter and disinfection byproduct precursors in the Sacramento-San Joaquin River Delta: A geochemical approach
T.E.C. Kraus, B.A. Bergamaschi, P.J. Hernes, R.G.M. Spencer, R. Stepanauskas, C. Kendall, R.F. Losee, R. Fujii
2008, Organic Geochemistry (39) 1302-1318
This study assesses how rivers, wetlands, island drains and open water habitats within the Sacramento-San Joaquin River Delta affect dissolved organic matter (DOM) content and composition, and disinfection byproduct (DBP) formation. Eleven sites representative of these habitats were sampled on six dates to encompass seasonal variability. Using a suite of...
A national reconnaissance of pharmaceuticals and other organic wastewater contaminants in the United States - I) Groundwater
K.K. Barnes, D.W. Kolpin, E. T. Furlong, S.D. Zaugg, M. T. Meyer, L. B. Barber
2008, Science of the Total Environment (402) 192-200
As part of the continuing effort to collect baseline information on the environmental occurrence of pharmaceuticals, and other organic wastewater contaminants (OWCs) in the Nation's water resources, water samples were collected from a network of 47 groundwater sites across 18 states in 2000. All samples collected were analyzed for 65...
Sources and fate of nitrate in the Illinois River Basin, Illinois
S.V. Panno, W.R. Kelly, Keith C. Hackley, H.-H. Hwang, A.T. Martinsek
2008, Journal of Hydrology (359) 174-188
We conducted a two-year investigation into the sources and fate of nitrate (NO3-) in the Illinois River from the Chicago area to the river's confluence with the Mississippi River. Samples from waterways in the Chicago area (Des Plaines River and the Sanitary and Ship Canal) had relatively high concentrations of...
Groundwater discharge along a channelized Coastal Plain stream
D.M. LaSage, Joshua L. Sexton, A. Mukherjee, A.E. Fryar, S.F. Greb
2008, Journal of Hydrology (360) 252-264
In the Coastal Plain of the southeastern USA, streams have commonly been artificially channelized for flood control and agricultural drainage. However, groundwater discharge along such streams has received relatively little attention. Using a combination of stream- and spring-flow measurements, spring temperature measurements, temperature profiling along the stream-bed, and geologic mapping,...
Geochemical controls of elevated arsenic concentrations in groundwater, Ester Dome, Fairbanks district, Alaska
P. L. Verplanck, S. H. Mueller, R.J. Goldfarb, D. Kirk Nordstrom, E. K. Youcha
2008, Chemical Geology (255) 160-172
Ester Dome, an upland area near Fairbanks, Alaska, was chosen for a detailed hydrogeochemical study because of the previously reported elevated arsenic in groundwater, and the presence of a large set of wells amenable to detailed sampling. Ester Dome lies within the Fairbanks...
Geolocation of man-made reservoirs across terrains of varying complexity using GIS
D.M. Mixon, D.A. Kinner, R.F. Stallard, J.P.M. Syvitski
2008, Computers & Geosciences (34) 1184-1197
The Reservoir Sedimentation Survey Information System (RESIS) is one of the world's most comprehensive databases of reservoir sedimentation rates, comprising nearly 6000 surveys for 1819 reservoirs across the continental United States. Sediment surveys in the database date from 1904 to 1999, though more than 95% of surveys were entered prior...
Monitoring waterbird abundance in wetlands: The importance of controlling results for variation in water depth
F. Bolduc, A. D. Afton
2008, Ecological Modelling (216) 402-408
Wetland use by waterbirds is highly dependent on water depth, and depth requirements generally vary among species. Furthermore, water depth within wetlands often varies greatly over time due to unpredictable hydrological events, making comparisons of waterbird abundance among wetlands difficult as effects of habitat variables and water depth are confounded....
Assessing streamflow characteristics as limiting factors on benthic invertebrate assemblages in streams across the western United States
C.P. Konrad, A.M.D. Brasher, J. T. May
2008, Freshwater Biology (53) 1983-1998
1. Human use of land and water resources modifies many streamflow characteristics, which can have significant ecological consequences. Streamflow and invertebrate data collected at 111 sites in the western U.S.A. were analysed to identify streamflow characteristics (magnitude, frequency, duration, timing and variation) that are probably to limit characteristics of benthic...
Evaluating regional patterns in nitrate sources to watersheds in national parks of the Rocky Mountains using nitrate isotopes
L. Nanus, M.W. Williams, K. Campbell, E.M. Elliott, C. Kendall
2008, Environmental Science & Technology (42) 6487-6493
In the Rocky Mountains, there is uncertainty about the source areas and emission types that contribute to nitrate (NO3) deposition, which can adversely affect sensitive aquatic habitats of high-elevation watersheds. Regional patterns in NO3 deposition sources were evaluated using NO3 isotopes in five National Parks, including 37 lakes and 7...
Carbon isotope fractionation of dissolved inorganic carbon (DIC) due to outgassing of carbon dioxide from a headwater stream
D.H. Doctor, C. Kendall, S.D. Sebestyen, J. B. Shanley, N. Ohte, E.W. Boyer
2008, Hydrological Processes (22) 2410-2423
The stable isotopic composition of dissolved inorganic carbon (??13C-DIC) was investigated as a potential tracer of streamflow generation processes at the Sleepers River Research Watershed, Vermont, USA. Downstream sampling showed ?? 13C-DIC increased between 3-5??? from the stream source to the outlet weir approximately 0??5 km downstream, concomitant with increasing...
