Conference Papers
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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.
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Silver and other tracers of sewage particles in coastal and deep sea sediments off the east coast, USA Silver and other tracers of sewage particles in coastal and deep sea sediments off the east coast, USA
No abstract available.
Authors
Michael H. Bothner, Marilyn R. Buchholtz ten Brink, G.E. Ravizza
Simplified method for estimating total streambed scour at bridges in Illinois Simplified method for estimating total streambed scour at bridges in Illinois
A simplified method to estimate total streambed scour was developed for application to approximately 10,000 Local Agency bridges (bridges owned by local governments and not by the State of Illinois). This method consists of using total scour-envelope curves, developed as empirical relations between calculated total scour and bridge characteristics for 303 State Highway Bridges, to...
Authors
Robert R. Holmes, Daniel G. Ghere, Chad J. Dunn
Simulation of interaction between ground water in an alluvial aquifer and surface water in a large braided river Simulation of interaction between ground water in an alluvial aquifer and surface water in a large braided river
The Fairbanks, Alaska, area has many contaminated sites in a shallow alluvial aquifer. A ground-water flow model is being developed using the MODFLOW finite-difference ground-water flow model program with the River Package. The modeled area is discretized in the horizontal dimensions into 118 rows and 158 columns of approximately 150-meter square cells. The fine grid spacing has the...
Authors
S. A. Leake, M. R. Lilly
Suspended-solids flux in Suisun Bay, California Suspended-solids flux in Suisun Bay, California
No abstract available.
Authors
A. Tobin, D. H. Schoellhamer, J.R. Burau
Three-dimensional inverse modelling using heads and concentrations at a Danish landfill Three-dimensional inverse modelling using heads and concentrations at a Danish landfill
A three-dimensional inverse model using hydraulic heads and concentrations of non-reactive solutes is presented. Application to the Danish Grindsted Old Landfill is used to investigate how the concentration data affects estimates of horizontal and vertical hydraulic conductivity and longitudinal dispersivity as well as prediction uncertainty
Authors
Heidi Christiansen Barlebo, Mary C. Hill, Dan Rosbjerg, Karsten H. Jensen
Trend analyses of sediment data for the DEC project Trend analyses of sediment data for the DEC project
Daily stream discharge, suspended-sediment concentration, and suspended-sediment discharge data were collected at eight sites in six watersheds of the Demonstration Erosion Control project in the Yazoo River Basin in north-central Mississippi during the period July 1985 through September 1991. The project is part of an ongoing interagency program of planning, design, construction...
Authors
Richard Allen Rebich
Use of hydrologic budgets and hydrochemistry to determine ground-water and surface-water interactions for Rapid Creek, Western South Dakota Use of hydrologic budgets and hydrochemistry to determine ground-water and surface-water interactions for Rapid Creek, Western South Dakota
The study of ground-water and surface-water interactions often employs streamflow-gaging records and hydrologic budgets to determine ground-water seepage. Because ground-water seepage usually is computed as a residual in the hydrologic budget approach, all uncertainty of measurement and estimation of budget components is associated with the ground-water seepage. This uncertainty can...
Authors
Mark T. Anderson
Using GIS for verification of bathymetric data from Long Island sound Using GIS for verification of bathymetric data from Long Island sound
Accurate depiction of the topography of the seafloor in coastal areas is needed for modeling of ecosystems and processes, and also as a framework for analyzing and displaying information used in management decisions. Often, errors must be corrected before acquired digital data bases can be used. To create an acceptable data set, two corrected versions of a Long Island Sound data base...
Authors
Muriel S. Grim, Barbara A. Seekins, Thomas E. Chase
What do we know about wolves and what more do we need to learn? What do we know about wolves and what more do we need to learn?
No abstract available.
Authors
L. David Mech
Winter wolf predation in a multiple ungulate prey system, Gates of the Arctic National Park, Alaska Winter wolf predation in a multiple ungulate prey system, Gates of the Arctic National Park, Alaska
We investigated patterns of winter wolf predation, including prey selection, prey switching, kill rates, carcass utilization, and consumption rates for four wolf packs during three different study periods (March 1989, March 1990, and November 1990) in Gates of the Arctic National Park and Preserve, Alaska. Wolves killed predominantly caribou (165 caribou, seven moose, and five Dall sheep...
Authors
Bruce W. Dale, Layne G. Adams, R. Terry Bowyer
Wolf predation on caribou calves in Denali National Park, Alaska Wolf predation on caribou calves in Denali National Park, Alaska
During 1987-1991, 29 to 45 radio-collared caribou cows were monitored daily during calving each year and their calves were radio-collared (n = 147 calves) to investigate calf production and survival. We determined characteristics of wolf predation on caribou calves and, utilizing information from a companion wolf study, evaluated the role of spacing by caribou cows in minimizing wolf...
Authors
Layne G. Adams, B. Dale, L. David Mech
A GIS-based decision support system for wetland permit analysis A GIS-based decision support system for wetland permit analysis
No abstract available.
Authors
Wei Ji, James Johnston