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.
Browse almost 5,000 conference papers authored by our scientists and refine search by topic, location, year, and advanced search.
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Long-term observations of migrating shore-normal bars
A series of migrating shore-normal sandbars with wavelengths of 50-200 m and heights of 0.5-2 m have been identified off the northern tip of Anna Maria Island, a barrier island on the west-central Florida coast. Similar features have been described elsewhere since the 1930's and termed `transverse bars.' The transverse bars identified off Anna Maria Island are found for about 3 km along the coast
Authors
Guy Gelfenbaum, Gregg R. Brooks
Low shear stress gravel-bed river
A low stress gravel bed river is a river where the cross-sectional average dimensionless shear stress (??*) rarely exceeds 0.047. That is the case for the Gunnison River below Delta in Western Colorado. The cross-sectional average ??* in the Gunnison River has not exceeded 0.047, except at one cross section during one year, in the 87 years of record. A ??* of 0.047 is the critical ??* in the bed-l
Authors
Robert T. Milhous
Low-rank coal formation in Poland and the United States: I. Zitau Basin, Poland
No abstract available.
Authors
J.R. Kasinski, R. B. Finkelman, M. Piwocki, R.W. Stanton, Peter D. Warwick
Mapping the radon potential of the united states: Examples from the Appalachians
The geologic radon potential of the United States was recently assessed by the U.S. Geological Survey. Results indicate that approximately 33% of the U.S. population lives within geologic provinces where the average indoor radon levels have the potential to be greater than 4 pCi/L (147 Bq/m3). Rock types most commonly associated with high indoor radon include: 1) Uraniferous metamorphosed sediment
Authors
L.C.S. Gundersen, R. R. Schumann
Molecular tools for the diagnosis of infectious hematopoietic necrosis virus
Abstract not available
Authors
J. R. Winton
Near bottom velocity and suspended solids measurements in San Francisco Bay, California
Ability to accurately measure long-term time-series of turbulent mean velocity distribution within the bottom boundary layer (BBL) in addition to suspended solids concentration (SSC) is critical to understanding complex processes controlling transport, resuspension, and deposition of suspended sediments in bays and estuaries. A suite of instruments, including broad band acoustic Doppler current pr
Authors
Jeffrey W. Gartner, Ralph T. Cheng, David A. Cacchione, George B. Tate
Normalizing rainfall/debris-flow thresholds along the U.S. Pacific coast for long-term variations in precipitation climate
Broad-scale variations in long-term precipitation climate may influence rainfall/debris-flow threshold values along the U.S. Pacific coast, where both the mean annual precipitation (MAP) and the number of rainfall days (#RDs) are controlled by topography, distance from the coastline, and geographic latitude. Previous authors have proposed that rainfall thresholds are directly proportional to MAP,
Authors
Raymond C. Wilson
Nowcast model for hazardous material spill prevention and response, San Francisco Bay, California
The National Oceanic and Atmospheric Administration (NOAA) installed the Physical Oceanographic Real-time System (PORTS) in San Francisco Bay, California, to provide real-time observations of tides, tidal currents, and meteorological conditions to, among other purposes, guide hazardous material spill prevention and response. Integrated with nowcast modeling techniques and dissemination of real-tim
Authors
Ralph T. Cheng, Wayne L. Wilmot, Jerry A. Galt
Overview of USGS sediment research and monitoring capabilities
For more than a century the USGS, as its name implies, has been the leading federal earth science research organization for the Nation. With the recent addition to the USGS of the National Biological Service in October 1996, as the Biological Resources Division, the mission of the USGS has broadened and the Survey's research capabilities are strengthened considerably. The USGS is now in a position
Authors
J. R. Gray, S.J. Williams, S.E. Finger, J. W. Jones
Physical processes affecting the sedimentary environments of Long Island Sound
A modeling study was undertaken to simulate the bottom tidal-, wave-, and wind-driven currents in Long Island Sound in order to provide a general physical oceanographic framework for understanding the characteristics and distribution of seafloor sedimentary environments. Tidal currents are important in the funnel-shaped eastern part of the Sound, where a strong gradient of tidal-current speed was
Authors
R. P. Signell, H.J. Knebel, J. H. List, A.S. Farris
Population genetic studies of the sea otter (Enhydra lutris): A review and interpretation of available data
Current information about the utility of genetic markers for estimating population structuring in sea otters (Enhydra lutris) is reviewed. Analyses of spatial population structuring with biochemical and molecular genetic markers are discussed in the context of the species' ecology and history of exploitation. Studies that have used a diversity of genetic markers including allozymes, mitochondrial
Authors
Kim T. Scribner, James L. Bodkin, Brenda E. Ballachey, Steven R. Fain, Matthew A. Cronin, Maria D. Sanchez