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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Frequency spectral analysis of GPR data over a crude oil spill
A multi-offset ground penetrating radar (GPR) dataset was acquired by the U.S. Geological Survey (USGS) at a crude oil spill site near Bemidji, Minnesota, USA. The dataset consists of two, parallel profiles, each with 17 transmitter-receiver offsets ranging from 0.60 to 5.15m. One profile was acquired over a known oil pool floating on the water table, and the other profile was acquired over an unc
Authors
B.L. Burton, G.R. Olhoeft, M.H. Powers
From the Field: Efficacy of visual barriers in reducing black-tailed prairie dog colony expansion
[No abstract available]
Authors
J.W. Merriman, P.J. Zwank, C. W. Boal, T.L. Bashore
Geophysical techniques in detection to river embankments - A case study: To locate sites of potential leaks using surface-wave and electrical methods
Geophysical technologies are very effective in environmental, engineering and groundwater applications. Parameters of delineating nature of near-surface materials such as compressional-wave velocity, shear-wave velocity can be obtained using shallow seismic methods. Electric methods are primary approaches for investigating groundwater and detecting leakage. Both of methods are applied to detect em
Authors
C. Chen, J. Liu, S. Xu, J. Xia
Geospatial techniques for developing a sampling frame of watersheds across a region
Current land-management decisions that affect the persistence of native salmonids are often influenced by studies of individual sites that are selected based on judgment and convenience. Although this approach is useful for some purposes, extrapolating results to areas that were not sampled is statistically inappropriate because the sampling design is usually biased. Therefore, in recent investiga
Authors
Robert E. Gresswell, Douglas S. Bateman, George Lienkaemper, T.J. Guy
Geothermal resources of California sedimentary basins
The 2004 Department of Energy (DOE) Strategic Plan for geothermal energy calls for expanding the geothermal resource base of the United States to 40,000 MW of electric power generating potential. This will require advances in technologies for exploiting unconventional geothermal resources, including Enhanced Geothermal Systems (EGS) and geopressured geothermal. An investigation of thermal conditio
Authors
C.F. Williams, F.V. Grubb, S.P. Galanis
Glacier ice mass fluctuations and fault instability in tectonically active Southern Alaska
Across the plate boundary zone in south central Alaska, tectonic strain rates are high in a region that includes large glaciers undergoing wastage (glacier retreat and thinning) and surges. For the coastal region between the Bering and Malaspina Glaciers, the average ice mass thickness changes between 1995 and 2000 range from 1 to 5 m/year. These ice changes caused solid Earth displacements in our
Authors
J.M. Sauber, B. F. Molnia
Guidelines for managing lesser prairie-chicken populations and their habitats
Lesser prairie-chicken (Tympanuchus pallidicinctus) populations have declined by >90% since the 1800s. These declines have concerned both biologists and private conservation groups and led to a petition to list the lesser prairie-chicken as threatened under the Endangered Species Act. Most of the land in the current range of the lesser prairie-chicken is privately owned, and declines have been pri
Authors
C.A. Hagen, B.E. Jamison, K.M. Giesen, T.Z. Riley
Historical perspectives on the concept of ecosystem degradation
The concept of environmental degradation has evolved with the development of human society and settlement. In early human development, tribes went through a series of cycles of taming or developing mastery over the environment, to utilizing the resources of that environment until they could no longer support the population, which lead to moving on to do it again in a new area. There seems to have
Authors
W. L. Halvorson
Historical trend in the ratio of solid to total precipitation
No abstract available
Authors
Thomas G. Huntington, Glenn A. Hodgkins, B.D. Keim, Robert W. Dudley
History and effects of hatchery salmon in the Pacific
There has been a long history of production of hatchery salmon along the Pacific coast - from California’s first efforts in the 1870s using eggs from chinook and rainbow trout to the recent large-scale production hatcheries for pink salmon in Japan and the Russian Far East. The rationale for this production has also varied from replacement of fish lost in commercial ocean harvests to mitigation an
Authors
Jennifer L. Nielsen
Holocene alluvium around Lefkosia (Nicosia), Cyprus: An archive of land-use, tectonic processes, and climate change
Holocene alluvium of the Pedhicos River around Lefkosia (Nicosia), Cyprus, was studied. Alluvial stratigraphy was found to present serial flood deposits underlying river terraces and an extensive alluvial fan. It was found that the stratigraphy and geomorphology of the alluvium can be interpreted to distinguish not only the effects of climate change, but also land-use change, and the impact of par
Authors
Wayne L. Newell, B. Stone, R. Harrison
Hydraulic modeling and scour analysis for the San Francisco - Oakland Bay Bridge
A study was conducted to determine potential maximum scour depths for the foundations of the replacement east span of the San Francisco-Oakland Bay Bridge, as part of the ongoing structural design. This effort presented unique challenges as strong tidal currents, large depths, and cohesive bottom sediments characterize the site. The authors met these challenges with a multi-faceted approach to the
Authors
J.G. Shelden, E.D. Smith, D.M. Sheppard, M. Odeh