Conference Papers
Science Quality and Integrity
The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
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Trapping and migration of methane associated with the gas hydrate stability zone at the Blake Ridge Diapir: New insights from seismic data Trapping and migration of methane associated with the gas hydrate stability zone at the Blake Ridge Diapir: New insights from seismic data
The Blake Ridge Diapir is the southernmost of a line of salt diapirs along the Carolina trough. Diapirs cause faulting of the superjacent sediments, creating pathways for migration of fluids and gas to the seafloor. We analyzed reflection seismic data from the Blake Ridge Diapir, which is located in a region with known abundant gas hydrate occurrence. A striking feature in these data is...
Authors
M.H. Taylor, William P. Dillon, I.A. Pecher
Treatment of internal sources in the finite-volume ELLAM Treatment of internal sources in the finite-volume ELLAM
The finite-volume Eulerian-Lagrangian localized adjoint method (FVELLAM) is a mass-conservative approach for solving the advection-dispersion equation. The method has been shown to be accurate and efficient for solving advection-dominated problems of solute transport in ground water in 1, 2, and 3 dimensions. Previous implementations of FVELLAM have had difficulty in representing...
Authors
R. W. Healy
Tritium/3He measurements in young groundwater: Progress in applications to complex hydrogeological systems Tritium/3He measurements in young groundwater: Progress in applications to complex hydrogeological systems
Tritium/3He dating has been applied to many problems in groundwater hydrology including, for example, determination of circulation patterns, mean residence times, recharge rates, or bank infiltration. Here, we discuss recent progress in the application of the tritium/3He dating method to sites with complex hydrogeological settings. Specifically, we report on tritium/3He dating at sites...
Authors
Peter Schlosser, Stephanie D. Shapiro, Martin Stute, Niel Plummer
U.S. Geological Survey, remote sensing, and geoscience data: Using standards to serve us all U.S. Geological Survey, remote sensing, and geoscience data: Using standards to serve us all
The U.S. Geological Survey (USGS) advocates the use of standards with geosciences and remotely sensed data and metadata for its own purposes and those of its customers. In activities that range from archiving data to making a product, the incorporation of standards makes these functions repeatable and understandable. More important, when accepted standards are followed, data discovery...
Authors
Michael G. Benson, John Faundeen
Use of on-site refugia to protect unionid populations from zebra mussel-induced mortality Use of on-site refugia to protect unionid populations from zebra mussel-induced mortality
Protecting unionid populations as zebra mussels spread into inland waterways has relied mainly on relocating at-risk animals into aquaculture facilities. While such relocations are the only viable management technique for some populations, facility availability is limited, leaving many unionids facing extirpation. Another management strategy is in-situ protection either by enhancing...
Authors
S. Jerrine Nichols, M. Glen Black, Jeffrey D. Allen
Use of risk assessment to evaluate effects and plan remediation of abandoned mines Use of risk assessment to evaluate effects and plan remediation of abandoned mines
A framework of risk assessment is elaborated for the evaluation of the effects of abandoned mines and mills. Steps in this process include environmental description, identification and characterization of sources, assessment of exposure, assessment of effects, risk characterization, and risk management of remediation. The development and use of ecological end-points for remediation is...
Authors
T.P. Boyle
Use of the 'Legal-Institutional Analysis Model' for resolving environmental disputes involving hydropower Use of the 'Legal-Institutional Analysis Model' for resolving environmental disputes involving hydropower
No abstract available.
Authors
Nina Burkardt, Berton Lee Lamb
USGS investigations of rural Arizona watersheds; hydrogeology of the Coconino Plateau; background and current status USGS investigations of rural Arizona watersheds; hydrogeology of the Coconino Plateau; background and current status
No abstract available.
Authors
Donald J. Bills, M.E. Flynn, Betsy Woodhouse
USGS research on three mid-latitude glaciers USGS research on three mid-latitude glaciers
Low- and mid-latitude regions of the earth are home to 80 to 90 percent of the world's population. Because of this, the U.S. Geological Survey (USGS) is conducting a research program to study the geochemistry of precipitation, snow, ice, and runoff samples from mid-latitude glaciers in Kyrghyzstan, Nepal, and the United States, Areas of research, such as ground-water studies...
Authors
J.R. Green, L. DeWayne Cecil, D. L. Naftz, P. F. Schuster
USGS World Petroleum Assessment 2000: New Conventional Provinces USGS World Petroleum Assessment 2000: New Conventional Provinces
The USGS has completed a new assessment of the undiscovered oil and gas resources of the world. One hundred and five geologic provinces were analyzed for assessment. Assessment units (AU) that comprise Total Petroleum Systems (TPS) were identified and described for each of these provinces. The AU served as the basis for assessing undiscovered petroleum within these provinces, 157 TPS and...
Authors
Thomas S. Ahlbrandt, T. R. Klett
Using GIS and GPS to map seasonal distribution and relative density of Independence Valley speckled dace and Independence Valley tui chub Using GIS and GPS to map seasonal distribution and relative density of Independence Valley speckled dace and Independence Valley tui chub
No abstract available
Authors
P.H. Rissler, G.G. Scoppettone, S. Shea, S. Byers
Wildlife in a chemical world Wildlife in a chemical world
Snapping turtles were collected by the Ohio State EPA from six locations in Ohio believed to have different contaminant concentrations. Previously we reported significant correlations among four hepatic microsomal dealkylases and CYP1A in these turtles. Herein we compare ethoxyresorufin-O-dealkylase (EROD) and methoxyROD (MROD) to tissue contaminant concentrations. For Fifty-four of...
Authors
M. J. Melancon, J.S. Russell, J.F. Estenik, S.W. Fisher, H. Dabrowska