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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Time-dependent landslide probability mapping Time-dependent landslide probability mapping
Case studies where time of failure is known for rainfall-triggered debris flows can be used to estimate the parameters of a hazard model in which the probability of failure is a function of time. As an example, a time-dependent function for the conditional probability of a soil slip is estimated from independent variables representing hillside morphology, approximations of material...
Authors
Russell H. Campbell, Richard L. Bernknopf
Trends of sandstone po rosity in the Anadarko Basin- a preliminary evaluation Trends of sandstone po rosity in the Anadarko Basin- a preliminary evaluation
No abstract available.
Authors
T.C. Hester
TRIM—3D: a three-dimensional model for accurate simulation of shallow water flow TRIM—3D: a three-dimensional model for accurate simulation of shallow water flow
A semi-implicit finite difference formulation for the numerical solution of three-dimensional tidal circulation is discussed. The governing equations are the three-dimensional Reynolds equations in which the pressure is assumed to be hydrostatic. A minimal degree of implicitness has been introduced in the finite difference formula so that the resulting algorithm permits the use of large...
Authors
Vincenzo Casulli, Enrico Bertolazzi, Ralph T. Cheng
U.S. Geological Survey bedload sampling policy U.S. Geological Survey bedload sampling policy
During the late 1960's, the U.S. Geological Survey's (USGS) Water Resources Division (WRD) developed the Helley-Smith bedload sampler. Since then, the USGS and the Technical Committee of the Federal Interagency Subcommittee on Sedimentation (Technical Committee) have performed extensive flume and field studies concerning the calibration and use of bedload samplers. The policy and...
Authors
G. Douglas Glysson
Use of geophysical data to assess scour development Use of geophysical data to assess scour development
The development of scour holes in the Connecticut River near the new Baldwin Bridge has been documented by comparing geophysical records collected before (1989), during (1990), and after (1992) bridge construction. Eight piers that support the 570-m (meter) span over the Connecticut River were protected by 12-m wide cofferdams during construction. The maximum flow during the study was...
Authors
Gary Placzek, Peter F. Haeni, Roy Trent
Using a GIS to link digital spatial data and the precipitation-runoff modeling system, Gunnison River Basin, Colorado Using a GIS to link digital spatial data and the precipitation-runoff modeling system, Gunnison River Basin, Colorado
The U.S. Geological Survey Precipitation-Runoff Modeling System, a modular, distributed-parameter, watershed-modeling system, is being applied to 20 smaller watersheds within the Gunnison River basin. The model is used to derive a daily water balance for subareas in a watershed, ultimately producing simulated streamflows that can be input into routing and accounting models used to assess
Authors
William A. Battaglin, Gerhard Kuhn, Randolph S. Parker
Variation of froude number with discharge for large-gradient steams Variation of froude number with discharge for large-gradient steams
Under chemical-control conditions, the Froude number (f) for a cross-section can be approximated as a function of the ratio R2/ 3/d 1/2 , where R is the hydraulic radius and d is the average depth. For cross sections where the ratio increases with increasing depth, F can also increase with depth Current-meter measurement data for 433 streamflow gaging stations in Colorado were reviewed...
Authors
Kenneth L. Wahl
Water-level, velocity, and dye measurements in the Chicago tunnels Water-level, velocity, and dye measurements in the Chicago tunnels
On April 13, 1992, a section of a 100-year-old underground freight tunnel in downtown Chicago, Illinois was breached where the tunnel crosses under the Chicago River, about 15 meters below land surface. The breach allowed water from the Chicago River to flow into the freight tunnels and into buildings connected to the tunnels. As a result, utility services to more than 100 buildings in...
Authors
K. A. Oberg, A.R. Schmidt
Where are all the birds going? In search of the wintering grounds of the endangered least Bell's vireo Where are all the birds going? In search of the wintering grounds of the endangered least Bell's vireo
No abstract available at this time
Authors
B.E. Kus
Using GIS to determine the effects of contaminated sediments on natural resources in an estuary Using GIS to determine the effects of contaminated sediments on natural resources in an estuary
No abstract available.
Authors
P.F. Roscigno, G. M. Martin, J. B. Johnston, Mary C. Watzin
Use of ground-penetrating radar and continuous seismic-reflection profiling on surface-water bodies in environmental and engineering studies Use of ground-penetrating radar and continuous seismic-reflection profiling on surface-water bodies in environmental and engineering studies
No abstract available.
Authors
F.P. Haeni