Effects of benthic fauna on arsenic transport in Whitewood Creek, South Dakota
James S. Kuwabara, C.C.Y. Chang, S.P. Pasilis
James S. Kuwabara, C. C. Fuller, editor(s)
2004, Book chapter, Toxic substances in surface waters and sediments: A study to assess the effects of arsenic-contaminated alluvial sediment in Whitewood Creek, South Dakota
Field measurements and bioassay experiments were done to investigate the effects of arsenic and phosphorus interactions on sorption of these solutes by the benthic flora (periphyton and submerged macrophytes) in Whitewood Creek, a stream in western South Dakota. Short-term (24-hour) sorption experiments were used to determine arsenic transport characteristics...
Porosity and pore-size distribution
John R. Nimmo
2004, Book chapter, Encyclopedia of soils in the environment
No abstract available. ...
Using geochemical data and aquifer simulation to characterize recharge and groundwater flow in the Middle Rio Grande Basin, New Mexico
Niel Plummer, Ward E. Sanford, Laura M. Bexfield, Scott K. Anderholm, Eurybiades Busenberg
James F. Hogan, Fred M. Phillips, Bridget R. Scanlon, editor(s)
2004, Book chapter, Groundwater recharge in a desert environment: The southwestern United States
No abstract available. ...
Selenium loading through the Blackfoot River watershed--linking sources to ecosystem
Theresa S. Presser, Matthew Hardy, Mark Huebner, Paul J. Lamothe
James R. Hein, editor(s)
2004, Book chapter, Handbook of exploration and environmental geochemistry
The upper Blackfoot River watershed in southeast Idaho receives drainage from 11 of 16 phosphate mines that have extracted ore from the Phosphoria Formation, three of which are presently active. Toxic effects from selenium (Se), including death of livestock and deformity in aquatic birds, were documented locally in areas...
Fundamental concepts of recharge in the Desert Southwest: A regional modeling perspective
Alan L. Flint, Lorraine E. Flint, J.A. Hevesi
2004, Book chapter, Groundwater recharge in a desert environment: The southwestern United States
Recharge in arid basins does not occur in all years or at all locations within a basin. In the desert Southwest potential evapotranspiration exceeds precipitation on an average annual basis and, in many basins, on an average monthly basis. Ground-water traveltime from the surface to the water table and recharge...
Water year 2004: Western water managers feel the heat
Thomas Pagano, Phil Pasteris, Michael D. Dettinger, Daniel Cayan, Kelly Redmond
2004, Eos, Earth and Space Science News (85) 385-393
This spring, a rare combination of exceptionally warm temperatures and near-record lack of precipitation in the western United States caused a rapid change in hydrologic conditions and an unexpectedly early onset of spring conditions. With much of the western U.S. already in its fifth year of drought, an above-average western snowpack...
Riparian ecosystem assessments
J. Stromberg, M. Briggs, M. Scott, P. Shafroth
M. B. Baker, P. F. Ffolliott, L. F. DeBano, D. G. Neary, editor(s)
2004, Book chapter, Riparian areas of the southwestern United States: Hydrology, ecology, and management
No abstract available....
Transport and time lag of chlorofluorocarbon gases in the unsaturated zone, Rabis Creek, Denmark
Peter Engesgaard, Anker L. Højberg, Klaus Hinsby, Karsten H. Jensen, Troels Laier, Flemming Larsen, Eurybiades Busenberg, Niel Plummer
2004, Vadose Zone Journal (3) 1249-1261
Transport of chlorofluorocarbon (CFC) gases through the unsaturated zone to the water table is affected by gas diffusion, air–water exchange (solubility), sorption to the soil matrix, advective–dispersive transport in the water phase, and, in some cases, anaerobic degradation. In deep unsaturated zones, this may lead to a time lag between...
Air temperature and snowmelt discharge characteristics, Merced River at Happy Isles, Yosemite National Park, Central Sierra Nevada
D. Peterson, R. Smith, S. Hager, D. Cayan, M. Dettinger
2004, Conference Paper, Proceedings of the Twentieth Annual Pacific Climate Workshop
No abstract available....
Impact of clay minerals on sulfate-reducing activity in aquifers
D. Wong, J.M. Suflita, J.P. McKinley, L.R. Krumholz
2004, Microbial Ecology (47) 80-86
Previous studies have shown that sulfate-reduction activity occurs in a heterogeneous manner throughout the terrestrial subsurface. Low-activity regions are often observed in the presence of clay minerals. Here we report that clays inhibit sulfate reduction activity in sediments and in a pure culture of Desulfovibriovulgaris. Clay...
Use of PRD1 bacteriophage in groundwater viral transport, inactivation, and attachment studies
Ronald W. Harvey, Joseph N. Ryan
2004, FEMS Microbiology Ecology (49) 3-16
PRD1, an icosahedra-shaped, 62 nm (diameter), double-stranded DNA bacteriophage with an internal membrane, has emerged as an important model virus for studying the manner in which microorganisms are transported through a variety of groundwater environments. The popularity of this phage for use in transport studies involving geologic media is due,...
Atlas of depth-duration frequency of precipitation annual maxima for Texas
William H. Asquith, Meghan C. Roussel
2004, Texas Department of Transportation Project Summary Report 5–1301–01–S
The objective of this Texas Department of Transportation (TxDOT) and U.S. Geological Survey (USGS) cooperatively funded project was to develop a simple-to-use atlas of precipitation depths in Texas for selected storm durations and frequencies on the basis of the research results and unpublished digital archives of Asquith (1998). The selected...
Alkaline hydrolysis/polymerization of 2,4,6-Trinitrotoluene: Characterization of products by 13C and 15N NMR
Kevin A. Thorn, Philip G. Thorne, Larry G. Cox
2004, Environmental Science & Technology (38) 2224-2231
Alkaline hydrolysis has been investigated as a nonbiological procedure for the destruction of 2,4,6-trinitrotoluene (TNT) in explosives contaminated soils and munitions scrap. Nucleophilic substitutions of the nitro and methyl groups of TNT by hydroxide ion are the initial steps in the alkaline degradation of TNT. Potential applications of the technique...
Reach-scale cation exchange controls on major ion chemistry of an Antarctic glacial meltwater stream
Michael N. Gooseff, Diane M. McKnight, Robert L. Runkel
2004, Aquatic Geochemistry (10) 221-238
McMurdo dry valleys of Antarctica represent the largest of the ice-free areas on the Antarctic continent, containing glaciers, meltwater streams, and closed basin lakes. Previous geochemical studies of dry valley streams and lakes have addressed chemical weathering reactions of hyporheic substrate and geochemical evolution of dry valley surface waters. We...
A walk through the hydroclimate network in Yosemite National Park: River chemistry
Dave Peterson, Richard Smith, Stephen Hager
2004, Sierra Nature Notes (4) 1-16
Visitors to Yosemite National Park (YNP) are fully aware of the weather, snowmelt, waterfalls (Photo 1), and river discharge and river and lake water temperature. They are not, however, thinking about river chemistry because you can’t see, hear, or feel it. So a river chemistry article in Nature Notes needs...
A Holocene history of dune-mediated landscape change along the southeastern shore of Lake Superior
Walter L. Loope, Timothy G. Fisher, Harry M. Jol, John B. Anderton, William L. Blewett
2004, Geomorphology (61) 303-322
Causal links that connect Holocene high stands of Lake Superior with dune building, stream damming and diversion and reservoir impoundment and infilling are inferred from a multidisciplinary investigation of a small watershed along the SE shore of Lake Superior. Radiocarbon ages of wood fragments from in-place stumps and soil O...
Atmospheric wet deposition of trace elements to a suburban environment, Reston, Virginia, USA
Kathryn M. Conko, Karen C. Rice, Margaret M. Kennedy
2004, Atmospheric Environment (38) 4025-4033
Wet deposition from a suburban area in Reston, Virginia was collected during 1998 and analyzed to assess the anion and trace-element concentrations and depositions. Suburban Reston, approximately 26 km west of Washington, DC, is densely populated and heavily developed. Wet deposition was collected bi-weekly in an automated collector using trace-element clean...
Hydrochemical tracers in the middle Rio Grande Basin, USA: 1. Conceptualization of groundwater flow
Niel Plummer, L. M. Bexfield, S. K. Anderholm, W. E. Sanford, E. Busenberg
2004, Hydrogeology Journal (12) 359-388
Chemical and isotopic data for groundwater from throughout the Middle Rio Grande Basin, central New Mexico, USA, were used to identify and map groundwater flow from 12 sources of water to the basin, evaluate radiocarbon ages, and refine the conceptual model of the Santa Fe Group aquifer system.Hydrochemical...
Effect of cell physicochemical characteristics and motility on bacterial transport in groundwater
M.W. Becker, S.A. Collins, D.W. Metge, R.W. Harvey, A.M. Shapiro
2004, Journal of Contaminant Hydrology (69) 195-213
The influence of physicochemical characteristics and motility on bacterial transport in groundwater were examined in flow-through columns. Four strains of bacteria isolated from a crystalline rock groundwater system were investigated, with carboxylate-modified and amidine-modified latex microspheres and bromide as reference tracers. The bacterial isolates included a gram-positive rod (ML1), a...
A resampling procedure for generating conditioned daily weather sequences
Martyn P. Clark, Subhrendu Gangopadhyay, David Brandon, Kevin Werner, Lauren E. Hay, Balaji Rajagopalan, David Yates
2004, Water Resources Research (40)
A method is introduced to generate conditioned daily precipitation and temperature time series at multiple stations. The method resamples data from the historical record “nens” times for the period of interest (nens = number of ensemble members) and reorders the ensemble members to reconstruct the observed spatial (intersite) and temporal...
Improved spatial resolution for U-series dating of opal at Yucca Mountain, Nevada, USA, using ion-microprobe and microdigestion methods
J.B. Paces, L.A. Neymark, J. L. Wooden, H.M. Persing
2004, Geochimica et Cosmochimica Acta (68) 1591-1606
Two novel methods of in situ isotope analysis, ion microprobe and microdigestion, were used for 230Th/U and 234U/238U dating of finely laminated opal hemispheres formed in unsaturated felsic tuff at Yucca Mountain, Nevada, proposed site for a high-level radioactive waste repository. Both methods allow analysis of layers as many as...
Rapid assessment indicator of wetland integrity as an unintended predictor of avian diversity
Martin A. Stapanian, Thomas A. Waite, Gregory Krzys, John J. Mack, Mick Micacchion
2004, Hydrobiologia (520) 119-126
Rapid assessment of aquatic ecosystems has been widely implemented, sometimes without thorough evaluation of the robustness of rapid assessment metrics as indicators of ecological integrity. Here, we evaluate whether the Ohio Rapid Assessment Method (ORAM) for Wetlands Version 5.0 is a useful indicator of ecological integrity beyond its intended purpose....
Sorption of 99mTc radiopharmaceutical compounds by soils
S. Jurisson, J. Gawenis, E. R. Landa
2004, Health Physics (87) 423-428
Study of the sorption of 99mTc radiopharmaceutical compounds by soils has assessed the fate of these compounds in the event of a surface spill and examined the potential of these compounds as hydrologic tracers. Sorption from deionized water, filtered Missouri River water, and artificial seawater by five surface soils was...
Denitrification and hydrologic transient storage in a glacial meltwater stream, McMurdo Dry Valleys, Antarctica
M.N. Gooseff, Diane M. McKnight, R.L. Runkel, J.H. Duff
2004, Limnology and Oceanography (49) 1884-1895
In extreme environments, retention of nutrients within stream ecosystems contributes to the persistence of aquatic biota and continuity of ecosystem function. In the McMurdo Dry Valleys, Antarctica, many glacial meltwater streams flow for only 5–12 weeks a year and yet support extensive benthic microbial communities. We investigated...
The application of an integrated biogeochemical model (PnET-BGC) to five forested watersheds in the Adirondack and Catskill regions of New York
Chen LiJun, C. T. Driscoll, S. Gbondo-Tugbawa, M.J. Mitchell, Peter S. Murdoch
2004, Hydrological Processes (18) 2631-2650
PnET-BGC is an integrated biogeochemical model formulated to simulate the response of soil and surface waters in northern forest ecosystems to changes in atmospheric deposition and land disturbances. In this study, the model was applied to five intensive study sites in the Adirondack and Catskill regions of New York. Four...
