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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Economic decision making and the application of nonparametric prediction models
Sustained increases in energy prices have focused attention on gas resources in low permeability shale or in coals that were previously considered economically marginal. Daily well deliverability is often relatively small, although the estimates of the total volumes of recoverable resources in these settings are large. Planning and development decisions for extraction of such resources must be are
Authors
Emil D. Attanasi, Timothy C. Coburn, Philip A. Freeman
Effect of an offshore sinkhole perforation in a coastal confined aquifer on submarine groundwater discharge
In order to explore submarine groundwater discharge in the vicinity of karst features that penetrate the confining layer of an offshore, partially confined aquifer, we constructed a three-dimensional groundwater model using the SUTRA (Saturated-Unsaturated TRAnsport) variable-density groundwater flow model. We ran a parameter sensitivity analysis, testing the effects of recharge rates, permeabilit
Authors
S.E. Fratesi, V. Leonard, W. E. Sanford
Effect of tidal fluctuations on contaminant transfer to the ocean
Variable-density groundwater flow was simulated to examine the effects that tide has on the coastward migration of a contaminant through a freshwater/saltwater interface and toward a coastal ocean boundary. Simulated ocean tides did not significantly affect the total contaminant mass input to the ocean; however, the difference in tidal and non-tidal simulated concentrations could be as much as 15%
Authors
I.L. Licata, C.D. Langevin, A.M. Dausman
Effects of antenna length and material on output power and detection of miniature radio transmitters
The optimal antenna of transmitters used in small aquatic animals is often a compromise between efficient radio wave propagation and effects on animal behavior. Radio transmission efficiency generally increases with diameter and length of the conductor, but increased antenna length or weight can adversely affect animal behavior. We evaluated the effects of changing antenna length and material on t
Authors
J.W. Beeman, N. Bower, S. Juhnke, L. Dingmon, Tillaart Van Den, T. Thomas
Eo-Ulrichian to Neo-Ulrichian views: The renaissance of "layer-cake stratigraphy"
Classical notions of "layer-cake stratigraphy" have been denigrated as representing an antiquated "Neptunian" view of the geologic record with the American paleontologist-stratigrapher E.O. Ulrich vilified as its quintessential advocate. Some of the extreme "layer-cake" interpretations of E.O. Ulrich are demonstrably incorrect, especially where applied in marginal marine and terrestrial settings.
Authors
Carlton E. Brett, P.I. McLaughlin, G.C. Baird
Ephemeroptera, plecoptera, megaloptera, and trichoptera of Great Smoky Mountains National Park
Great Smoky Mountains National Park (GSMNP), situated on the mountainous border of North Carolina and Tennessee, is recognized as one of the most highly diverse protected areas in the temperate region. In order to provide baseline data for the scientific management of GSMNP, an All Taxa Biodiversity Inventory (ATBI) was initiated in 1998. Among the goals of the ATBI are to discover the identity an
Authors
C.R. Parker, O.S. Flint, L.M. Jacobus, B.C. Kondratieff, W.P. McCafferty, J.C. Morse
Estimating locations and total magnetization vectors of compact magnetic sources from scalar, vector, or tensor magnetic measurements through combined Helbig and Euler analysis
The Helbig method for estimating total magnetization directions of compact sources from magnetic vector components is extended so that tensor magnetic gradient components can be used instead. Depths of the compact sources can be estimated using the Euler equation, and their dipole moment magnitudes can be estimated using a least squares fit to the vector component or tensor gradient component data
Authors
J. D. Phillips, M.N. Nabighian, D.V. Smith, Y. Li
Evaluating the accotink creek restoration project for improving water quality, in-stream habitat, and bank stability
Increased urbanization results in a larger percentage of connected impervious areas and can contribute large quantities of stormwater runoff and significant quantities of debris and pollutants (e.g., litter, oils, microorganisms, sediments, nutrients, organic matter, and heavy metals) to receiving waters. To improve water quality in urban and suburban areas, watershed managers often incorporate be
Authors
S.D. Struck, A. Selvakumar, K. Hyer, T. O'Connor
Evolving plans for the USA National Phenology Network
[No abstract available]
Authors
J.L. Betancourt, M.D. Schwartz, D.D. Breshears, C.A. Brewer, G. Frazer, J.E. Gross, S.J. Mazer, B. C. Reed, B.E. Wilson
Exploring rippled scour depressions offshore Huntington Beach, CA
Morphological model computations based on uniform (non-graded) sediment revealed an unrealistically strong scour of the sea floor in the immediate vicinity to the west of Maasvlakte 2. By means of a state-of-the-art graded sediment transport model the effect of natural armouring and sorting of bed material on the scour process has been examined. Sensitivity computations confirm that the developmen
Authors
Eleyne L. Phillips, Curt D. Storlazzi, Peter Dartnell, Brian D. Edwards
Extensive hydrothermal rock alteration in a low pH, steam-heated environment--Hot Springs Basin, Yellowstone National Park
No abstract available.
Authors
S. Hurwitz, J. B. Lowenstern, D. Bergfeld, C. Werner, H. Heasler, C. Jaworowski