Conference Papers
Science Quality and Integrity
The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
Browse almost 5,000 conference papers authored by our scientists and refine search by topic, location, year, and advanced search.
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Simulation of methyl tert-butyl ether (MTBE) transport to ground water from immobile sources of gasoline in the vadose zone Simulation of methyl tert-butyl ether (MTBE) transport to ground water from immobile sources of gasoline in the vadose zone
The mathematical model, R-UNSAT, developed to simulate the transport of benzene and MTBE in representative sand and clay hydrogeologic systems was evaluated. The effects on groundwater were simulated for small, chronic-, and single-volume releases of gasoline trapped in unsaturated soil. Hydrocarbon biodegradation was simulated by using a dual Monod-type kinetics model that includes...
Authors
M.A. Lahvis, L.C. Rehmann
Socioeconomic impacts of climate change on U.S. water supplies Socioeconomic impacts of climate change on U.S. water supplies
A greenhouse warming would have major effects on water supplies and demands. A framework for examining the socioeconomic impacts associated with changes in the long-term availability of water is developed and applied to the hydrologic implications of the Canadian and British Hadley2 general circulation models (GCMs) for the 18 water resource regions in the conterminous United States. The...
Authors
K.D. Frederick, G. E. Schwarz
Strategies for ensuring global consistency/comparability of water-quality data Strategies for ensuring global consistency/comparability of water-quality data
In the past 20 years the water quality of the United States has improved remarkably-the waters are safer for drinking, swimming, and fishing. However, despite many accomplishments, it is still difficult to answer such basic questions as: 'How clean is the water?' and 'How is it changing over time?' These same questions exist on a global scale as well. In order to focus water-data issues...
Authors
J.M. Klein
Stream restoration at Denali National Park and Preserve Stream restoration at Denali National Park and Preserve
Placer mining for gold has severely disturbed many riparian ecosystems in northern regions. We are conducting a long-term project to test methods to promote restoration of a placer-mined watershed in Denali National Park and Preserve. The project included hydrological restoration of the unstable and excessively confined stream with heavy equipment. We stabilized the floodplain with...
Authors
Roseann V. Densmore, Kenneth F. Karle
Successful experimental reproduction of early mortality syndrome in Lake trout: Research task report on early mortality syndrome workshop Successful experimental reproduction of early mortality syndrome in Lake trout: Research task report on early mortality syndrome workshop
No abstract available at this time
Authors
D. C. Honeyfield
Targeted stock identification using multilocus genotype 'familyprinting' Targeted stock identification using multilocus genotype 'familyprinting'
We present an approach to stock identification of small, targeted populations that uses multilocus microsatellite genotypes of individual mating adults to uniquely identify first- and second-generation offspring in a mixture. We call the approach 'familyprinting'; unlike DNA fingerprinting where tissue samples of individuals are matched, offspring from various families are assigned to...
Authors
B.H. Letcher, T.L. King
The occurrence of wetlands within the context of hydrologic landscapes The occurrence of wetlands within the context of hydrologic landscapes
No abstract available.
Authors
Thomas C. Winter
The role of groundwater chemistry in the transport of bacteria to water-supply wells The role of groundwater chemistry in the transport of bacteria to water-supply wells
Static mini-columns and in situ injection and recovery tests were used to assess the effects of modest changes in groundwater chemistry upon the pH-dependence of bacterial attachment, a primary determinant of bacterial mobility in drinking water aquifers. In uncontaminated groundwater (
Authors
R.W. Harvey, D.W. Metge
The spring runoff pulse from the Sierra Nevada The spring runoff pulse from the Sierra Nevada
Just about every year there is one major first pulse of snowmelt runoff (streamflow) that marks the transition from winter to spring in high elevation, snowmelt driven watersheds in the western United States. As a index, we have used the record of relatively pristine streamflow at the Merced River, Happy Isles in Yosemite National Park to identify this transition for each year beginning...
Authors
D.R. Cayan, D. H. Peterson, L. Riddle, M. D. Dettinger, R. Smith
The use of modeling in restoration ecology: The Everglades case The use of modeling in restoration ecology: The Everglades case
No abstract available.
Authors
Donald L. DeAngelis
U.S. Geological Survey coal resource assessment U.S. Geological Survey coal resource assessment
No abstract available.
Authors
S.S. Crowley, John R. SanFilipo, Peter D. Warwick, S.J. Law, Claire E. Aubourg