Hydrologic units
Water Resources Division, U.S. Geological Survey
1998, Report, National atlas of the United States
No abstract available....
Scale effects in fluid flow through fractured geologic media
Paul A. Hsieh
Garrison Sposito, editor(s)
1998, Book chapter, Scale dependence and scale invariance in hydrology
No abstract available. ...
Chloride and tritium concentrations in a thick unsaturated zone underlying an intermittent stream in the Mojave Desert, Southern California, USA
John A. Izbicki, Robert L. Michel, P. Martin
J. V. Brahana, Y. Eckstein, editor(s)
1998, Book chapter, Gambling with groundwater: Physical, chemical, and biological aspects of aquifer-stream relations
No abstract available. ...
Soil sorption of organic pollutants and pesticides
C. T. Chiou
Robert A. Meyers, editor(s)
1998, Book chapter, Encyclopedia of environmental analysis and remediation
No abstract available....
Predictive double-layer modeling of metal sorption in mine-drainage systems
K. S. Smith, J. F. Ranville, D.L. Macalady
E. A. Jenne, editor(s)
1998, Book chapter, Adsorption of metals by geomedia: Variables, mechanisms, and model applications
Previous comparison of predictive double-layer modeling and empirically derived metal-partitioning data has validated the use of the double-layer model to predict metal sorption reactions in iron-rich mine-drainage systems. The double-layer model subsequently has been used to model data collected from several mine-drainage sites in Colorado with diverse geochemistry and geology....
Fundamentals of isotope geochemistry
Carol Kendall, Eric A. Caldwell
1998, Book chapter, Isotope tracers in catchment hydrology
The dominant use of isotopes in catchment research in the last few decades has been to trace sources of waters and solutes. Generally, such data were evaluated with simple mixing models to determine how much was derived from either of the two (sometimes three) constant-composition sources. This chapter illustrates the...
Use of 13C NMR and FTIR for elucidation of degradation pathways during natural litter decomposition and compositing. III. Characterization of leachate from different types of leaves
Robert L. Wershaw, J. A. Leenheer, K. R. Kennedy
G. Davis, E.A. Ghabbour, editor(s)
1998, Book chapter, Humic substances structures, properties, and uses
No abstract available. ...
Isotopes as indicators of environmental change
James B. Shanley, Elise Pendall, Carol Kendall, Lora R. Stevens, Robert L. Michel, Patrick J. Phillips, Richard Forester, David L. Naftz, Beiling Liu, Libby Stern, Brent B. Wolfe, C. Page Chamberlain, Steven W. Leavitt, T. H. Heaton, Bernhard Mayer, L. DeWayne Cecil, W. Berry Lyons, Brian G. Katz, Julio L. Betancourt, Diane M. McKnight, Joel D. Blum, Thomas W.D. Edwards, Harold R. House, Emi Ito, Ramon O. Aravena, Joseph F. Whelan
1998, Book chapter, Isotope tracers in catchment hydrology
In addition to providing an understanding of processes within a catchment system, isotopic techniques have been instrumental in providing reconstructions of catchment climate and other environmental indicators at various time scales. Many recent changes are a direct consequence of anthropogenic activities. Isotopic analysis serves as a valuable tool for distinguishing...
Using transport model interpretations of tracer tests to study microbial processes in groundwater
Richard L. Smith, Stephen P. Garabedian
1998, Book chapter, Mathematical modeling in microbial ecology
It has long been known that microorganisms affect the geochemistry of groundwater. But despite this recognition, little detailed information is available regarding the rates and the factors controlling microbial processes in groundwater. Part of the reason stems from the relatively inaccessible nature of most groundwater and the difficulties encountered in...
Considerations in As analysis and speciation
M. Edwards, S. Patel, L. McNeil, H.W. Chen, M. Frey, A.D. Eaton, Ronald C. Antweiler, Howard E. Taylor
1998, Journal of the American Water Works Association (43) 1378-1383
This article summarizes recent experiences in arsenic (As) quantification, preservation, and speciation developed during AWWA Research Foundation (AWWARF) and Water Industry Technical Action Fund (WITAF) projects. The goal of this article is to alert analysts and decision-makers to potential problems in As analysis and speciation, because there appear to be...
Satellite telemetry: A new tool for wildlife research and management
Steven G. Fancy, Larry F. Pank, David C. Douglas, Catherine H. Curby, Gerald W. Garner, Steven C. Amstrup, Wayne L. Regelin
1998, Resource Publication 172
The U.S. Fish and Wildlife Service and the Alaska Department of Fish and Game have cooperated since 1984 to develop and evaluate satellite telemetry as a means of overcoming the high costs and logistical problems of conventional VHF (very high frequency) radiotelemetry systems. Detailed locational and behavioral data on caribou...
Selecting remediation goals by assessing the natural attenuation capacity of groundwater systems
Francis H. Chapelle, Paul M. Bradley
1998, Bioremediation Journal (2) 227-238
Remediation goals for the source areas of a chlorinated ethene‐contaminated groundwater plume were identified by assessing the natural attenuation capacity of the aquifer system. The redox chemistry of the site indicates that sulfate‐reducing (H2 ∼ 2 nanomoles [nM]) per liter conditions near the contaminant source grade to Fe(III)‐reducing conditions (H2...
Feldspars as a source of nutrients for microorganisms
J.R. Rogers, P.C. Bennett, W.J. Choi
1998, American Mineralogist (83) 1532-1540
Phosphorus and nitrogen are essential macronutrients necessary for the survival of virtually all living organisms. In groundwater systems, these nutrients can be quite scarce and can represent limiting elements for growth of subsurface microorganisms. In this study we examined silicate sources of these elements by characterizing the colonization and weathering...
Suitability of parametric models to describe the hydraulic properties of an unsaturated coarse sand and gravel
Andy Mace, David L. Rudolph, R. Gary Kachanoski
1998, Groundwater (36) 465-475
The performance of parametric models used to describe soil water retention (SWR) properties and predict unsaturated hydraulic conductivity (K) as a function of volumetric water content (θ) is examined using SWR and K(θ) data for coarse sand and gravel sediments. Six 70 cm long, 10 cm diameter cores of glacial...
Biodegradation of crude oil into nonvolatile organic acids in a contaminated aquifer near Bemidji, Minnesota
K. A. Thorn, G. R. Aiken
1998, Organic Geochemistry (29) 909-931
As the result of a pipeline burst, a body of light aliphatic crude oil floats atop the groundwater in a shallow sand and gravel aquifer in a remote area outside Bemidji, Minnesota. Biodegradation has resulted in the formation of a plume of DOC downgradient from the oil body. Groundwater has...
Flow and suspended particulate transport in a tidal bottom layer, south San Francisco Bay, California
R. T. Cheng, J. W. Gartner, D.A. Cacchione, G. B. Tate
1998, Conference Paper, Physics of estuaries and coastal seas: Proceedings of the 8th International Biennial Conference on Physics of Estuaries and Coastal Seas
Field investigations of the hydrodynamics and the resuspension and transport of particulate matter in a bottom boundary layer were carried out in South San Francisco Bay, California during March-April 1995. The GEOPROBE, an instrumented bottom tripod, and broad-band acousti Doppler current profilers were used in this investigation. The instrument assemblage...
Location of wells shown in "Structure, outcrop,, and subcrop of the bedrock aquifers along the western margin of the Denver Basin, Colorado." Hydrologic Atlas 742
Sharon Rafferty
1998, Report
This digital geospatial data set consists of locations of coal, oil, gas and water wells shown as data points in the report, "Structure, Outcrop, and Subcrop of the Bedrock Aquifers Along the Western Margin of the Denver Basin, Colorado" (Robson and others, 1998)....
Structure contours of top of Laramie-Fox Hills aquifer in "Structure, outcrop, and subcrop of the bedrock aquifers along the western margin of Denver Basin, Colorado." Hydrologic Atlas 742
Sharon Rafferty
1998, Report
This digital geospatial data set consists of structure contours of the top of the Laramie-Fox Hills aquifer along the Front Range of Colorado. The U.S. Geological Survey developed this data set as part of a project described in the report, "Structure, Outcrop, and Subcrop of the Bedrock Aquifers Along...
Trace element trophic transfer in aquatic organisms: A critique of the kinetic model approach
J.R. Reinfelder, N.S. Fisher, S. N. Luoma, J.W. Nichols, W.-X. Wang
1998, Science of the Total Environment (213) 117-135
The bioaccumulation of trace elements in aquatic organisms can be described with a kinetic model that includes linear expressions for uptake and elimination from dissolved and dietary sources. Within this model, trace element trophic transfer is described by four parameters: the weight-specific ingestion rate (IR); the assimilation efficiency (AE); the...
Study-area boundary for "Structure, outcrop, and subcrop of the bedrock aquifers along the western margin of the Denver Basin, Colorado." Hydrologic Atlas 742
Sharon Rafferty
1998, Report
This digital geospatial data set consists of outlines of the study area in the report "Structure, Outcrop, and Subcrop of the Bedrock Aquifers Along the Western Margin of the Denver Basin, Colorado" (Robson and others, 1998)....
Results from the hydrodynamic element of the 1994 entrapment zone study in Suisun Bay
J.R. Burau, J. W. Gartner, M. Stacey
1998, Report
The entrapment zo as long been considered an important region of the San Francisco estuary. It has been the subject of several previous studies, and its location has been suggested as an index of condition of the estuarine ecosystem.A close correlate of this location, X2 1, is now used as...
Effects of delta outflow and local stream flow on salinity in south San Francisco Bay: 1995-1998
Laurence E. Schemel
1998, Interagency Ecological Program Newsletter (4) 32-33
No abstract available....
Coupled atmosphere-terrestrial ecosystem-hydrology models for environmental modeling
R. L. Walko, L.E. Band, Jill Baron, Timothy G.F. Kittel, R. Lammers, T. J. Lee, R.A. Pielke Sr., C. Taylor, C. Tague, C.J. Tremback, P.L. Vidale
1998, Book
No abstract available....
Structure contours of base of upper Arapahoe aquifer in "Structure, outcrop, and subcrop of the bedrock aquifers along the western margin of the Denver Basin, Colorado." Hydrologic Atlas 742
Sharon Rafferty
1998, Report
This digital geospatial data set consists of structure contours on the base of the upper member of the Arapahoe aquifer. The U.S. Geological Survey developed this data set as part of a project described in the report,"Structure, Outcrop, and Subcrop of the Bedrock Aquifers Along the Western Margin of the...
Carbon cycling in terrestrial environments: Chapter 17
Yang Wang, Thomas G. Huntington, Laurie J. Osher, Leonard I Wassenaar, Susan E. Trumbore, Ronald Amundson, Jennifer W. Harden, Diane M. McKnight, Sherry L. Schiff, George R. Aiken, W. Berry Lyons, Ramon O. Aravena, Jill Baron
1998, Book chapter, Isotope tracers in catchment hydrology
This chapter reviews a number of applications of isotopic techniques for the investigation of carbon cycling processes. Carbon dioxide (C02) is an important greenhouse gas. Its concentration in the atmosphere has increased from an estimated 270 ppm at the beginning of the industrial revolution to ∼ 360 ppm at present....
