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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Modeling black-footed ferret energetics: Are southern release sites better?
Several models have been developed to estimate prey requirements and to assess habitat suitability of release sites for the black-footed ferret (Mustela nigripes) (e.g., Stromberg and others, 1983; Powell and others, 1985; Biggins and others, 1993). None of these models, however, addressed possible differences in energetic requirements between sites due to climatic differences within the ferret’s
Authors
Lauren A. Harrington, Dean E. Biggins, A. William Alldredge
Modeling canopy turbulent flow over complex terrain
[No abstract available]
Authors
C. Yi, Russell K. Monson, Z. Zhai, D.E. Anderson, A.A. Turnipseed, Sean P. Burns, B. Lamb
Modeling nearshore morphological evolution at seasonal scale
A process-based model is compared with field measurements to test and improve our ability to predict nearshore morphological change at seasonal time scales. The field experiment, along the dissipative beaches adjacent to Grays Harbor, Washington USA, successfully captured the transition between the high-energy erosive conditions of winter and the low-energy beach-building conditions typical of sum
Authors
D.-J.R. Walstra, P. Ruggiero, G. Lesser, G. Gelfenbaum
Monitoring black-footed ferrets during reestablishment of free-ranging populations: Discussion of alternative methods and recommended minimum standards
Although the monitoring of black-footed ferret (Mustela nigripes) populations following reintroductions has not been haphazard, several ferret recovery groups since 1994 have recommended development of uniform standards prescribing minimum methods, intensities, and frequencies of monitoring that would provide data on population size, mortality rates, and recruitment. Such standards would promote c
Authors
Dean E. Biggins, Jerry L. Godbey, Marc R. Matchett, Louis R. Hanebury, Travis M. Livieri, Paul E. Marinari
National large-scale urban true orthophoto mapping and its standard initiative
[No abstract available]
Authors
G. Zhou, W. Xie, S. Benjamin, R.G. Fegeas, J. Simmers, H. Cluff, Y. Lei, J. Foust
Natural glide slab avalanches, Glacier National Park, USA: A unique hazard and forecasting challenge
In a museum of avalanche phenomena, glide cracks and glide avalanches might be housed in the “strange but true” section. These oddities are uncommon in most snow climates and tend to be isolated to specific terrain features such as bedrock slabs. Many glide cracks never result in avalanches, and when they do, the wide range of time between crack formation and slab failure makes them highly unpredi
Authors
Blase Reardon, Daniel B. Fagre, Mark Dundas, Chris Lundy
Net carbon exchange across the Arctic tundra-boreal forest transition in Alaska 1981-2000
Shifts in the carbon balance of high-latitude ecosystems could result from differential responses of vegetation and soil processes to changing moisture and temperature regimes and to a lengthening of the growing season. Although shrub expansion and northward movement of treeline should increase carbon inputs, the effects of these vegetation changes on net carbon exchange have not been evaluated. W
Authors
Catharine Copass Thompson, A. D. McGuire, Joy S. Clein, F. S. Chapin, J. Beringer
New ghost-node method for linking different models with varied grid refinement
A flexible, robust method for linking grids of locally refined ground-water flow models constructed with different numerical methods is needed to address a variety of hydrologic problems. This work outlines and tests a new ghost-node model-linking method for a refined "child" model that is contained within a larger and coarser "parent" model that is based on the iterative method of Steffen W. Mehl
Authors
S.C. James, J.E. Dickinson, S.W. Mehl, M. C. Hill, S. A. Leake, G.A. Zyvoloski, A.-A. Eddebbarh
Numerical modeling of magnetic moments for UXO applications
The surface magnetic anomaly observed in UXO clearance is mainly dipolar and, consequently, the dipole is the only magnetic moment regularly recovered in UXO applications. The dipole moment contains information about intensity of magnetization but lacks information about shape. In contrast, higher-order moments, such as quadrupole and octupole, encode asymmetry properties of the magnetization dist
Authors
V. Sanchez, Y. Li, M. Nabighian, D. Wright
Oil resources - Estimates and uncertainties
Oil reserves are reasonably well known, but they are not a reliable indicator of longterm supply. Future oil availability will depend upon reserve additions, which are highly uncertain. New reserves will come from three sources: 1) new field discoveries, 2) growth of reserves in existing fields, and 3) development of unconventional resources. U.S. Geological Survey estimates of global undiscovered
Authors
D. L. Gautier
Organic geochemistry - A retrospective of its first 70 years
Organic geochemistry had its origin in the early part of the 20th century when organic chemists and geologists realized that detailed information on the organic materials in sediments and rocks was scientifically interesting and of practical importance. The generally acknowledged "father" of organic geochemistry is Alfred E. Treibs (1899-1983), who discovered and described, in 1936, porphyrin pigm
Authors
K. A. Kvenvolden
Overview of selected surrogate technologies for continuous suspended-sediment monitoring
Surrogate technologies for inferring selected characteristics of suspended sediments in surface waters are being tested by the U.S. Geological Survey and several partners with the ultimate goal of augmenting or replacing traditional monitoring methods. Optical properties of water such as turbidity and optical backscatter are the most commonly used surrogates for suspended-sediment concentration, b
Authors
J. R. Gray, J. W. Gartner