Conference Papers
Science Quality and Integrity
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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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Geophysical borehole logging in the unsaturated zone, Yucca Mountain, Nevada
Borehole geophysical logging for site characterization in the volcanic rocks at the proposed nuclear waste repository at Yucca Mountain, Nevada, requires data collection under rather unusual conditions. Logging tools must operate in rugose, dry holes above the water table in the unsaturated zone. Not all logging tools will operate in this environment, therefore; careful consideration must be given
Authors
Ulrich Schimschal, Philip H. Nelson
Gravitational circulation in a tidal strait
Eight months of continuous measurements of tidal current profiles with an acoustic Doppler current profiler (ADCP) were made in Carquinez Strait, California, during 1988 for the purpose of estimating long-term variations in vertical profiles of Eulerian residual currents. Salinity stratification near the ADCP deployment site also was analyzed. The strength of density-driven gravitational circulati
Authors
P. E. Smith, R. T. Cheng, J.R. Burau, M.R. Simpson
Ground-water recharge from streamflow data, NW Florida
Annual base flows of streams draining Okaloosa County and adjacent areas in northwest Florida were determined through hydrograph separation and correlation techniques for purposes of evaluating variations in ground-water recharge rates. Base flows were least in the northern part of the county and greatest in the southern part. Topographic and soils data were then superimposed on the distribution o
Authors
John Vecchioli, W. C. Bridges, Roger P. Rumenik, J. W. Grubbs
Herbicides in streams. Midwestern United States
Results from a 2-year study of 149 streams geographically distributed across the corn-producing region of 10 midwestern States show that detectable concentrations of herbicides persist year round in most streams. Some herbicides exceeded proposed maximum contaminant levels for drinking water for periods of several weeks to several months following application. Atrazine was the most frequently dete
Authors
Donald A. Goolsby, E. Michael Thurman, Dana W. Kolpin
How do foraging seabirds sample their environment?
No abstract available.
Authors
G.L. Hunt, John F. Piatt, Kjell Einar Erikstad
Hydrologic and geochemical approaches for determining ground-water flow components
Lyman Lake is an irrigation-storage reservoir on the Little Colorado River near St. Johns, Arizona. The main sources of water for the lake are streamflow in the Little Colorado River and ground-water inflow from the underlying Coconino aquifer. Two approaches, a hydrologic analysis and a geochemical analysis, were used to compute the quantity of ground-water flow to and from Lyman Lake. Hydrologic
Authors
H. W. Hjalmarson, F. N. Robertson
Hydrologic monitoring for effects of geothermal and ground-water development, Long Valley caldera, California
No abstract available.
Authors
C. D. Farrar, D. L. Lyster
Immunostimulants effect nonspecific defense mechanisms and specific immune response in trout given Aeromonas salmonicida bacterins
No abstract available at this time
Authors
D. P. Anderson, G. Jeney
Implications of accelerated sea-level rise on Louisiana coastal environments
Natural and human-induced processes have combined to produce high rates of relative sea-level rise and coastal land loss in Louisiana. This paper presents historical trends in sea-level rise and the implication of predicted accelerated rise scenarios on Louisiana's coastal environments. Mean eustatic sea-level in the Gulf of Mexico is 0.23 cm/yr. In Louisiana, relative sea-level rise, which combin
Authors
Karen E. Ramsey, Shea Penland, Harry H. Roberts
In characteristics of the first North American isolates of viral hemorrhagic septicemia virus
No abstract available
Authors
J. R. Winton, W.N. Batts, R. Brunson, K. Hopper, T. Nishizawa, C. Stehr
Infiltration of unconsumed irrigation water in Utah
The ground-water hydrology of Panguitch Valley and adjacent areas, south-central Utah, was studied during 1988-90. One objective of the study was to measure ground-water recharge from infiltration of unconsumed irrigation water. Water-level and soil-moisture data were used to estimate travel times for water moving down through the soil profile, and to compare quantities of water reaching the water
Authors
William C. Brothers, Susan A. Thiros
Is April to July runoff really decreasing in the Western United States?
Global warming has been the topic of a great deal of heated discussion and debate in recent years, both in the lay press and in scientific journals. The debate is about whether we are beginning to detect signs of a buildup of greenhouse gases on a global scale. A major part of the debate concerns the possible effects on climate and on the future availability of water resources. The ongoing drought
Authors
Kenneth L. Wahl