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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Freshwater mussels of the Chattahoochee and Flint rivers Freshwater mussels of the Chattahoochee and Flint rivers
No abstract available.
Authors
J.D. Williams, J. Brim-Box
Friction in debris flows: inferences from large-scale flume experiments Friction in debris flows: inferences from large-scale flume experiments
A recently constructed flume, 95 m long and 2 m wide, permits systematic experimentation with unsteady, nonuniform flows of poorly sorted geological debris. Preliminary experiments with water-saturated mixtures of sand and gravel show that they flow in a manner consistent with Coulomb frictional behavior. The Coulomb flow model of Savage and Hutter (1989, 1991), modified to include quasi...
Authors
Richard M. Iverson, Richard G. LaHusen
General implicit representation of hydraulic structures in numerical flow models General implicit representation of hydraulic structures in numerical flow models
Effects of hydraulic structures (such as culverts, bridge openings, or gates) can be simulated in numerical surface-water-flow models. Generally the scale and dimension of the numerical model is insufficient to model flow through the structure directly. However, if for a particular hydraulic structure a unique relation exists among headwater elevation, tailwater elevation, and discharge...
Authors
L. L. DeLong, J.M. Fulford
General implicit representation of hydraulic structures in numerical flow models General implicit representation of hydraulic structures in numerical flow models
No abstract available
Authors
L. L. DeLong, J.M. Fulford
Generalized statistical model of the Edwards Aquifer Generalized statistical model of the Edwards Aquifer
No abstract available
Authors
W.H. Asquith, M.E. Jennings
Genetic responses of Isonychia bicolor (Ephemeroptera:Oligoneuriidae) to chronic mercury pollution Genetic responses of Isonychia bicolor (Ephemeroptera:Oligoneuriidae) to chronic mercury pollution
No abstract available at this time
Authors
C.D. Snyder, A.C. Hendricks
Geologic assessments and characterization of marine sand resources - Gulf of Mexico region Geologic assessments and characterization of marine sand resources - Gulf of Mexico region
The U.S. Geological Survey conducts geologic surveys and research in marine areas of the United States and its territories and possessions. An objective in some of the investigations is locating and evaluating marine sand and gravel resources and interpretation of the origins of the sand body deposits. Results from such studies over the past 30 years show that many extremely large...
Authors
S. Jeffress Williams, Helana A. Cichon
Geological characterization of selected offshore sand resources on the OCS, offshore Alabama, for beach nourishment Geological characterization of selected offshore sand resources on the OCS, offshore Alabama, for beach nourishment
Most Alabama Gulf and estuarine shoreline is undergoing long-term erosion; threatened shorelines will need programs of replenishment and maintenance if they are to be even temporarily stabilized. Highest priority beach replenishment areas include eastern Dauphin Island; west of Perdido Pass; and west of the inlet at Little Lagoon. There are no appropriate local onshore sand sources...
Authors
David J. Davies, Steven J. Parker, W. Everett Smith
Geophysical investigations of buried volcanic centers near Yucca Mountain, Southwest Nevada Geophysical investigations of buried volcanic centers near Yucca Mountain, Southwest Nevada
Several aeromagnetic dipolar anomalies occur over flat, alluvial areas near Yucca Mountain that resemble anomalies typically associated with subaerial basaltic volcanic centers. Detailed gravity and ground magnetic data were collected along a surveyed traverse across an aeromagnetic anomaly in Amargosa Valley, south of Yucca Mountain, Nevada. Modeling of the ground magnetic data...
Authors
V.E. Langenheim, K. S. Kirchoff-Stein, H. W. Oliver
Geophysical investigations of concealed faults near Yucca Mountain, Southwest Nevada Geophysical investigations of concealed faults near Yucca Mountain, Southwest Nevada
Detailed gravity and ground magnetic data collected along surveyed traverses across Midway Valley, on the eastern flank of Yucca Mountain, Nevada reveal that these methods can be used to delineate concealed faults. These studies are part of an effort to evaluate faulting in the vicinity of the proposed surface facilities for a potential nuclear waste repository at Yucca Mountain. The...
Authors
D. A. Ponce
Geyser's magma chamber, California: constraints from gravity data, density measurements, and well information Geyser's magma chamber, California: constraints from gravity data, density measurements, and well information
A new crustal model based on isostatic residual gravity, geologic mapping, well information, and density measurements shows that the high-gradient parts of the residual gravity anomaly can be explained in terms of lithologic variations within the upper 7 km of the crust, consistent with the upper-crustal framework of the area. This conclusion does not rule out the presence of a magma...
Authors
Richard J. Blakely, W. D. Stanley
GPS network operations for the International GPS Geodynamics Service GPS network operations for the International GPS Geodynamics Service
As GPS technology comes of age in the 1990’s, it is evident that an internationally sponsored GPS tracking system is called for to provide consistent, timely ground tracking data and data products to the geophysical community. The planning group for the International GPS Geodynamics Service (IGS), sponsored by the International Association of Geodesy (IAG), is addressing all elements of...
Authors
Ruth E. Neilan