Estimating areas contributing recharge to wells, lessons from previous studies
O. Lehn Franke, T. E. Reilly, D.W. Pollock, J. W. LaBaugh
1998, Circular 1174
Factors relating to the estimation of areas contributing recharge to wells, such as complexity of the ground-water flow system, effects of changing hydrologic conditions, and effects of well-screen locations and pumping rates, are reviewed. The point of view that simulation is the best means to obtain physically based estimates of...
Low-flow water-quality characterization of the Gore Creek watershed, upper Colorado River basin, Colorado, August 1996
Kirby H. Wynn, Norman E. Spahr
1998, Fact Sheet 160-97
The Upper Colorado River Basin (UCOL) is one of 59 National Water-Quality Assessment (NAWQA) study units designed to assess the status and trends of the Nation?s water quality (Leahy and others, 1990). The UCOL study unit began operation in 1994, and surface-water-quality data collection at a network of 14 sites...
USGS Mineral Resources Program: International Activities
S.J. Kropschot
1998, Fact Sheet 011-98
The USGS is the country's leading earth science organization. Since 1879, USGS scientists have gathered and analyzed data and disseminated the results of their research on the geology, cartography, hydrology, and, more recently biology, of every continent and ocean on Earth. Multidisciplinary research both in the United States and in...
Anaerobic oxidation of [1,2-14C]Dichloroethene under Mn(IV)-reducing conditions
Paul M. Bradley, James Landmeyer, Richard S. Dinicola
1998, Applied and Environmental Microbiology (64) 1560-1562
Anaerobic oxidation of [1,2-14C]dichloroethene to14CO2 under Mn(IV)-reducing conditions was demonstrated. The results indicate that oxidative degradation of partially chlorinated solvents like dichloroethene can be significant even under anoxic conditions and demonstrate the potential importance of Mn(IV) reduction for remediation of chlorinated groundwater contaminants....
Intercomparison of principal hydrometric instruments; Third phase, Evaluation of ultrasonic velocity meters for flow measurement in streams, canals, and estuaries
Charles S. Melching, Michael W. Meno
1998, Report, WMO/TD
As part of the World Meteorological Organization (WMO) project Intercomparison of Principal Hydrometric Instruments, Third Phase, a questionnaire was prepared by the U.S. Geological Survey (USGS) on the application of Ultrasonic Velocity Meters (UVM's) for flowmeasurement in <span...
Effects of reservoir hydrology on reproduction by largemouth bass and spotted bass in Normandy Reservoir, Tennessee
Steven M. Sammons, L.G. Dorsey, Phillip William Bettoli, F.C. Fiss
1998, North American Journal of Fisheries Management (19) 78-88
Age-0 largemouth bass Micropterus salmoides and spotted bass M. punctulatus were collected from Normandy Reservoir, Tennessee, 1992–1996, to evaluate effects of reservoir hydrology and hatching of shad Dorosoma spp. on hatching and first-year growth and survival of these two species. Fish were collected in cove rotenone samples in early Aug...
Geographic trend in mercury measured in common loon feathers and blood
Joseph D. Kaplan, Michael W. Meyer, Peter S. Reaman, W. Emmett Braselton, A. Major, Neil Burgess, Anton M. Scheuhammer
1998, Environmental Toxicology and Chemistry (17) 173-183
The common loon (Gavia immer) is a high‐trophic‐level, long‐lived, obligate piscivore at risk from elevated levels of Hg through biomagnification and bioaccumulation. From 1991 to 1996 feather (n = 455) and blood (n = 381) samples from adult loons were collected between June and September in five regions of North America: Alaska,...
Hydrology and snowmelt simulation of Snyderville Basin, Park City, and adjacent areas, Summit County, Utah
Lynette E. Brooks, James L. Mason, David D. Susong
1998, Technical Publication 115
Increasing residential and commercial development is placing increased demands on the ground- and surface-water resources of Snyderville Basin, Park City, and adjacent areas in the southwestern corner of Summit County, Utah. Data collected during 1993-95 were used to assess the quantity and quality of the water resources in the study...
Biogeochemical cycles of nitrogen, phosphorus, and sulfur: Natural distributions and response to disturbance
M.E. McClain, Richard E. Bilby, F.J. Triska
R. Naiman, editor(s)
1998, Book chapter, The ecology and management of rivers and streams in the Pacific Northwest Ecoregion
No abstract available. ...
Sources and age of aquatic humus
Diane M. McKnight, George R. Aiken
1998, Book chapter, Aquatic humic substances: Ecology and biogeochemsitry
As aquatic scientists have recognized the diversity of processes controlled by or dependent upon aquatic humus, it has become important to learn more about the genesis, chemical properties, and concentration of humic substances in aquatic ecosystems. There are three classes of aquatic humus (fulvic acids, humic acids, and humin), all...
Use of 13C NMR and FTIR for elucidation of degradation pathways during natural litter decomposition and compositing. IV. Characterization of humic and fulvic acids extracted from senescent leaves
Robert L. Wershaw, K. R. Kennedy
1998, Book chapter, Humic substances structures, properties and uses
No abstract available. ...
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...
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...
Tidal creek changes at the Sonoma Baylands restoration site
John R. Dingler, David A. Cacchione
Magoon O.T.Converse H.Baird B.Miller-Henson M., editor(s)
1998, Conference Paper, Proceedings of the Conference on California and the World Ocean
Over the past 150 years, human activity has had a major impact on tidal wetlands adjoining the San Francisco Bay-Delta estuary Growing concern about the effect of this change on the ecology of the estuary has prompted Bay area managers to attempt to reclaim tidal wetlands. The Sonoma Baylands Restoration...
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...
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)....
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....
