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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Calibration strategies for a groundwater model in a highly dynamic alpine floodplain Calibration strategies for a groundwater model in a highly dynamic alpine floodplain
Most surface flows to the 20-km-long Maggia Valley in Southern Switzerland are impounded and the valley is being investigated to determine environmental flow requirements. The aim of the investigation is the devel-opment of a modelling framework that simulates the dynamics of the ground-water, hydrologic, and ecologic systems. Because of the multi-scale nature of the modelling framework...
Authors
L. Foglia, P. Burlando, Mary C. Hill, S. Mehl
Natural bitumen and extra-heavy oil Natural bitumen and extra-heavy oil
Crude oil is found in sedimentary rocks throughout the world, except, thus far, in Antarctica. In many places the oil has been degraded, so that it is represented by viscous black oil that is difficult to recover, transport, and refine. Depending upon the degree of degradation the result is extra-heavy oil or, in the extreme case, natural bitumen. Except in Canada, precise quantitative...
Authors
R. F. Meyer, Emil D. Attanasi
Traditional and new methods to derive sediment-discharge information in the United States Traditional and new methods to derive sediment-discharge information in the United States
No abstract available.
Authors
John R. Gray, G. Douglas Glysson
Economic impacts of anthropogenic activities on coastlines of the United States Economic impacts of anthropogenic activities on coastlines of the United States
Anthropogenic activities primarily impact coasts by reducing sediment inputs, altering sediment transport processes, and accelerating sediment losses to the offshore. These activities include: sand and gravel extraction, navigation and shore protection works; non-structural shoreline management strategies such as beach nourishment, sand by-passing and beach scraping, dams and flood...
Authors
Orville T. Magoon, S. Jeffress Williams, Linda K. Lent, James A. Richmond, Donald D. Treadwell, Scott L. Douglass, Billy L. Edge, Lesley C. Ewing, Anthony P. Pratt
Pesticide degradates: Monitoring and occurrence Pesticide degradates: Monitoring and occurrence
No abstract available.
Authors
D.W. Kolpin, W.A. Battaglin, M. T. Meyer, D.J. Schnoebelen, S. J. Kalkhoff
Topographic mapping of Mars: From hectometer to micrometer scales Topographic mapping of Mars: From hectometer to micrometer scales
We describe USGS topomapping of Mars at resolutions from 100 m to 30 µm with data from the latest spacecraft missions. Analysis of NASA 2001 Mars Odyssey Thermal Emission Imaging System (THEMIS) data combining daytime visible reflected, daytime IR emitted, and nighttime IR emitted images allows us to isolate the physical effects of topography, albedo, and thermal inertia. To a good...
Authors
Randolph L. Kirk, Steven W. Squyres, Gerhard Neukum
A new Mars Digital Image Model (MDIM 2.1) control network A new Mars Digital Image Model (MDIM 2.1) control network
The U.S. Geological Survey has recently completed a final revised version of its 231 m/pixel global Viking image mosaic of Mars that has substantially improved geodetic accuracy compared to versions released in 1991 and 2001. This mosaic, known as MDIM 2.1, is currently available in the USGS ISIS file format (see http://astrogeology.usgs.gov/Projects/MDIM21/) and will be formatted and...
Authors
Brent A. Archinal, Ella M. Lee, Randolph L. Kirk, T. C. Duxbury, Robert M. Sucharski, Debbie Cook, Janet M. Barrett
A new Mars Digital Image Model (MDIM 2.1) control network A new Mars Digital Image Model (MDIM 2.1) control network
The U.S. Geological Survey has recently completed a final revised version of its 231 m/pixel global Viking image mosaic of Mars that has substantially improved geodetic accuracy compared to versions released in 1991 and 2001. This mosaic, known as MDIM 2.1, is currently available in the USGS ISIS file format and will be formatted and submitted to the NASA Planetary Data System (PDS) in...
Authors
Brent A. Archinal, Ella M. Lee, Randolph L. Kirk, T. C. Duxbury, Robert M. Sucharski, Debbie Cook, Janet M. Barrett
Global environmental databases from CEOS agencies Global environmental databases from CEOS agencies
The Committee on Earth Observation Satellites (CEOS) is an international organization charged with coordinating international civil spaceborne missions designed to observe and study planet Earth. Comprising 44 space agencies and other national and international organizations, CEOS is recognized as the major international forum for the coordination of Earth observation satellite programs...
Authors
John Faundeen, I. Petiteville, T. Fisher
Responses of male fathead minnows to wastewater effluent--Indications of causative factors Responses of male fathead minnows to wastewater effluent--Indications of causative factors
No abstract available.
Authors
K. E. Lee, L. B. Barber, H.L. Schoenfuss
Ground-water evapotranspiration estimates near wet meadows using well hydrographs Ground-water evapotranspiration estimates near wet meadows using well hydrographs
No abstract available.
Authors
T.K. Cowdery