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.
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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Atmospheric circulation and snowpack in the Gunnison River Basin
Winter mean 700-millibar height anomalies over the eastern North Pacific Ocean and the western United States are related to variability in snowpack accumulations measured on or about April 1 in the Gunnison River Basin in Colorado. Higher-than-average snowpack accumulations are associated with negative 700-millibar height anomalies (anomalous cyclonic circulation) over the western United States an
Authors
Gregory J. McCabe
Bias in regression estimates of manning's n
Selected equations for estimating roughness for gravel-bed streams were tested using a composite data set containing much of the data used to define the equations. All equations tested were found to significantly underestimate n for relatively low discharges. For floods about equal to the median annual peak discharge, Jarrett's equation overestimates n (median error = 10 percent) while the other e
Authors
Kenneth L. Wahl
Biological impacts on wolves of exploitation and control: a response
No abstract available.
Authors
L. D. Mech
Brief summary of National Bridge Scour Data Base
This paper briefly summarizes more than 470 measurements of local channel scour at bridge piers from 58 sites in 14 States. Relations between local scour and selected deterministic parameters are illustrated and discussed. Observed scour depths are compared with predicted values from two local scour prediction equations.
Authors
Mark N. Landers, J. Sterling Jones, Roy E. Trent
Case for retrievable high-level nuclear waste disposal
Plans for the nation's first high-level nuclear waste repository have called for permanently closing and sealing the repository soon after it is filled. However, the hydrologic environment of the proposed site at Yucca Mountain, Nevada, should allow the repository to be kept open and the waste retrievable indefinitely. This would allow direct monitoring of the repository and maintain the options f
Authors
Eugene H. Roseboom
Coccidioidomycosis in southern sea otters
Disseminated coccidioidomycosis was diagnosed postmortem in six southern sea otters (Enhydra lutris nereis) found dying or dead along the Pacific Coast of California at San Luis Obispo County. These otters were found during winter or summer 1992, 1993, and 1994. Coccidioides immitis was identified by its morphology in tissue impression smears and by histopathology, and was confirmed by culture.
Authors
Nancy J. Thomas, Demosthenes Pappagianis, Lynn H. Creekmore, Ruth M. Duncan
Comparison of current meters used for stream gaging
The U.S. Geological Survey (USGS) is field and laboratory testing the performance of several current meters used throughout the world for stream gaging. Meters tested include horizontal-axis current meters from Germany, the United Kingdom, and the People's Republic of China, and vertical-axis and electromagnetic current meters from the United States. Summarized are laboratory test results for mete
Authors
Janice M. Fulford, Kirk G. Thibodeaux, William R. Kaehrle
Conservation of North Pacific shorebirds
In his introduction to the 1979 Symposium proceedings entitled “Shorebirds in Marine Environments," Frank Pitelka stressed the need for studies and conservation programs that spanned the western hemisphere (Pitelka 1979). In the 15 years since Pitelka's call to arms, the locations of many important migratory and wintering sites for shorebirds have been identified in the Americas (Senner and Howe 1
Authors
Robert E. Gill, Robert W. Butler, Pavel S. Tomkovich, Taej Mundkur, Colleen M. Handel
Contraction scour at a bridge over the Iowa River
Flooding of the Iowa River during July and August 1993 caused extensive contraction scour at the State Highway 99 bridge over the Iowa River at Wapello, Iowa. At least 3.3 m of piling under the footing of the second pier from the right (west) abutment were exposed. The scoured streambed did not fill in again after the flood receded, and a bathymetric survey in November 1993 showed that the streamb
Authors
Edward E. Fischer
Critical and supercritical flows in two unstable, mountain rivers, Toutle river system, Washington
Critical and supercritical flows are generally considered to be rare occurrences in natural river channels. This paper presents data and results pertaining to the existence of measured critical and supercritical flows at gaging stations on the North Fork Toutle River (NFT) and Toutle River main stem (TR). The data set includes 930 discharge measurements made by the staff of the U.S. Geological Sur
Authors
Andrew Simon, J. H. Hardison
Density gradient centrifugation: Application to the separation of macerals of type I, II, and III sedimentary organic matter
Samples of organic matter from nine well-known geological units (Green River Fm., Tasmanian Tasmanite, Lower Toarcian Sh. of the Paris Basin, Duwi Fm., New Albany Sh., Monterey Fm., Herrin No. 6 coal, Eocene coal, and Miocene lignite from Kalimantan) were processed by density gradient centrifugation (DGC) to isolate the constituent macerals. Optimal separation, as well as the liberation of microcr
Authors
B.A. Stankiewicz, M.A. Kruge, J.C. Crelling, G.L. Salmon
Design and operation of a system to monitor sediment deposition for protection of an endangered mussel
The USGS, in cooperation with the COE, has designed and installed a system to continuously monitor changes in elevation of the river bed over the mussel bed located downstream of the Olmsted Locks and Dam project. The installed system utilizes a multi-transducer acoustic ranging system to provide river bed elevation measurements accurate to plus or minus 1 cm. The system is currently collecting da
Authors
Michael S. Griffin, David S. Mueller