Lessons learned about metals in the estuary: The importance of long-term clam accumulation data
C. L. Brown, Samuel N. Luoma, Francis Parchaso, Janet K. Thompson
2004, Book chapter, The pulse of the estuary: Monitoring and managing water quality in the San Francisco estuary
No abstract available....
Geochemistry of coastal tarbells in southern California: A tribute to I.R. Kaplan
Keith A. Kvenvolden, Frances D. Hostettler
R.J. Hill, J. Leventhal, Zeev Aizenshtat, Mary Jo Baedecker, George E. Claypool, Robert P. Eganhouse, editor(s)
2004, Book chapter, Geochemical investigations in earth and space science: A tribute to Isaac R. Kaplan
No abstract available. ...
Evaluating remedial alternatives for the Alamosa River and Wightman Fork, near Summitville Mine, Colorado: Application of a reactive transport model to low- and high-flow simulations
J.W. Ball, R.L. Runkel, D. Kirk Nordstrom
2004, Book chapter, Environmental sciences and environmental computing
Reactive-transport processes in Wightman Fork and the Alamosa River downstream from the SummitvilleMine, south-central Colorado, were simulated at low and high flow using the OTEQ reactive-transport model.The simulations were calibrated using data from synoptic studies conducted during October 1998 and June1999. Discharge over the 30-km reach from just below the...
Aggregation: Physical aspects
John R. Nimmo
2004, Book chapter, Encyclopedia of soils in the environment
No abstract available. ...
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...
Monitoring radionuclide contamination in the unsaturated zone - Lessons learned at the Amargosa Desert Research Site, Nye County, Nevada
David A. Stonestrom, Jared D. Abraham, Brian J. Andraski, Ronald J. Baker, C. Justin Mayers, Robert L. Michel, David E. Prudic, Robert G. Striegl, Michelle Ann Walvoord
2004, Conference Paper, Proceedings, Workshop on long-term performance monitoring of metals and radionuclides in the subsurface
Contaminant-transport processes are being investigated at the U.S. Geological Survey’s Amargosa Desert Research Site (A DRS), adjacent to the Nation’s first commercial disposal facility for low-level radioactive waste. Gases containing tritium and radiocarbon are migrating through a 110-m thick unsaturated zone from unlined trenches that received waste from 1962 to...
Importance of clay size minerals for Fe(III) respiration in a petroleum-contaminated aquifer
Evgenya S. Shelobolina, Robert T. Anderson, Yury N. Vodyanitskii, Anatolii V. Sivtsov, Richard Yuretich, Derek R. Lovely
2004, Geobiology (2) 67-76
The availability of Fe(III)-bearing minerals for dissimilatory Fe(III) reduction was evaluated in sediments from a petroleum-contaminated sandy aquifer near Bemidji, Minnesota (USA). First, the sediments from a contaminated area of the aquifer, in which Fe(III) reduction was the predominant terminal electron accepting process, were compared with sediments from a nearby,...
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...
Object-based inversion of crosswell radar tomography data to monitor vegetable oil injection experiments
John W. Lane Jr., Frederick D. Day-Lewis, Roelof J. Versteeg, Clifton C. Casey
2004, Journal of Environmental & Engineering Geophysics (9) 63-77
Crosswell radar methods can be used to dynamically image ground-water flow and mass transport associated with tracer tests, hydraulic tests, and natural physical processes, for improved characterization of preferential flow paths and complex aquifer heterogeneity. Unfortunately, because the raypath coverage of the interwell region is limited by the borehole...
Enhanced gas-phase transport in a deep unsaturated zone, Amargosa Desert (U.S.A.)
Michelle Ann Walvoord, David A. Stonestrom
Karel Kovar, Z. Hrkal, J. Bruthans, editor(s)
2004, Conference Paper, International conference on finite element models, MODFLOW, and more: Solving groundwater problems
No abstract available....
Human alterations of riparian ecosystems
J. Stromberg, M. Briggs, C. Gourley, M. Scott, P. Shafroth, L. Stevens
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....
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....
Comparison of 13 equations for determining evapotranspiration from a prairie wetland, Cottonwood Lake Area, North Dakota, USA
Donald O. Rosenberry, David L. Stannard, Thomas C. Winter, Margo L. Martinez
2004, Wetlands (24) 483-497
Evapotranspiration determined using the energy-budget method at a semi-permanent prairie-pothole wetland in east-central North Dakota, USA was compared with 12 other commonly used methods. The Priestley-Taylor and deBruin-Keijman methods compared best with the energy-budget values; mean differences were less than 0.1 mm d−1, and standard deviations were less than 0.3...
Variability of hydrologic regimes and morphology in constructed open-ditch channels
J.S. Strock, J.A. Magner, W. B. Richardson, M.J. Sadowsky, G.R. Sands, R.T. Venterea
Cooke R.A., editor(s)
2004, Conference Paper, Proceedings of the 8th International Drainage Symposium - Drainage VIII
Open-ditch ecosystems are potential transporters of considerable loads of nutrients, sediment, pathogens and pesticides from direct inflow from agricultural land to small streams and larger rivers. Our objective was to compare hydrology and channel morphology between two experimental open-ditch channels. An open-ditch research facility incorporating a paired design was constructed...
Microbial precipitation of dolomite in methanogenic groundwater
Jennifer A. Roberts, Philip C. Bennett, Luis A. Gonzalez, G.L. Macpherson, Kitty L. Milliken
2004, Geology (32) 277-280
We report low-temperature microbial precipitation of dolomite in dilute natural waters from both field and laboratory experiments. In a freshwater aquifer, microorganisms colonize basalt and nucleate nonstoichiometric dolomite on cell walls. In the laboratory, ordered dolomite formed at near-equilibrium conditions from groundwater with molar Mg:Ca ratios of <1; dolomite was...
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...
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...
Inhibition and enhancement of microbial surface colonization: the role of silicate composition
Jennifer A. Roberts
2004, Chemical Geology (212) 313-327
Classical treatment of cell attachment by models of filtration or coulombic attraction assumes that attachment of cells to mineral surfaces would be controlled by factors such as response to predation, collision efficiency, or coulombic attraction between the charged groups at the mineral and cell surfaces. In the study reported here,...
Monitored natural attenuation forum: A panel discussion
Bruce E. Rittmann, Fran Kremer, Barbara Bekins
2004, Remediation Journal (14) 153-158
No abstract available....
"Implications of Observed and Simulated Ambient Flow in Monitoring Wells,” by Alper Elci, Fred J. Molz III, and W. R. Waldrop, November-December 2001 issue, v. 39, no. 6: 853–862
Fredrick L. Paillet
2004, Groundwater (42) 137-138
No abstract available....
Response to comment on "A reservoir of nitrate beneath desert soils"
Michelle Ann Walvoord, Fred M. Phillips, David A. Stonestrom, R. Dave Evans, Peter C. Hartsough, Brent D. Newman, Robert G. Striegl
2004, Science (304) 51-51
We appreciate the comment by Jackson et al. (1), which underscores two points made in our recent paper (2): (i) that desert subsoil nitrate (NO–3) inventories are spatially highly variable, and thereby warrant substantial measurement efforts to reduce uncertainty in global extrapolations, and (ii) that Chihuahuan Desert subsoil NO–3 inventories...
