Models for gas hydrate-bearing sediments inferred from hydraulic permeability and elastic velocities
Myung W. Lee
2008, Scientific Investigations Report 2008-5219
Elastic velocities and hydraulic permeability of gas hydrate-bearing sediments strongly depend on how gas hydrate accumulates in pore spaces and various gas hydrate accumulation models are proposed to predict physical property changes due to gas hydrate concentrations. Elastic velocities and permeability predicted from a cementation model differ noticeably from those...
Atmospheric Deposition and Surface-Water Chemistry in Mount Rainier and North Cascades National Parks, U.S.A., Water Years 2000 and 2005-2006
David W. Clow, Donald H. Campbell
2008, Scientific Investigations Report 2008-5152
High-elevation aquatic ecosystems in Mount Rainier and North Cascades National Parks are highly sensitive to atmospheric deposition of nitrogen and sulfur. Thin, rocky soils promote fast hydrologic flushing rates during snowmelt and rain events, limiting the ability of basins to neutralize acidity and assimilate nitrogen deposited from the atmosphere. Potential...
Differences in Reservoir Bathymetry, Area, and Capacity Between December 20-22, 2005, and June 16-19, 2008, for Lower Taum Sauk Reservoir, Reynolds County, Missouri
Gary L. Wilson, Joseph M. Richards
2008, Scientific Investigations Map 3061
On December 14, 2005, the embankment of the upper reservoir at the Taum Sauk pump storage facility, Reynolds County, Missouri, catastrophically failed and flooded the East Fork Black River, depositing debris and sediment in Johnson's Shut-Ins State Park, the lower Taum Sauk Reservoir, and downstream in the Black River (location...
An Integrated Hydrogeologic and Geophysical Investigation to Characterize the Hydrostratigraphy of the Edwards Aquifer in an Area of Northeastern Bexar County, Texas
Sachin D. Shah, Bruce D. Smith, Allan K. Clark, Jason Payne
2008, Scientific Investigations Report 2008-5181
In August 2007, the U.S. Geological Survey, in cooperation with the San Antonio Water System, did a hydrogeologic and geophysical investigation to characterize the hydrostratigraphy (hydrostratigraphic zones) and also the hydrogeologic features (karst features such as sinkholes and caves) of the Edwards aquifer in a 16-square-kilometer area of northeastern Bexar...
Current (2004-07) conditions and changes in ground-water levels from predevelopment to 2007, Southern High Plains aquifer, southeast New Mexico: Lea County underground water basin
Anne Tillery
2008, Scientific Investigations Map 3044
The Southern High Plains aquifer is the principal aquifer and primary source of water in southeastern New Mexico. The Lea County portion of the aquifer covers approximately the northern two thirds of the 4,393-square-mile county. Successful water-supply planning for New Mexico's Southern High Plains requires knowledge of the current aquifer...
Current (2004-07) conditions and changes in ground-water levels from predevelopment to 2007, Southern High Plains aquifer, east-central New Mexico: Curry County, Portales, and Causey Lingo underground water basins
Anne Tillery
2008, Scientific Investigations Map 3038
The Southern High Plains aquifer is the principal aquifer in Curry and Roosevelt Counties, N. Mex., and primary source of water in southeastern New Mexico. Successful water-supply planning for New Mexico's Southern High Plains requires knowledge of the current aquifer conditions and a context to estimate future trends given current...
Preliminary classification of water areas within the Atchafalaya Basin Floodway System by using landsat imagery
Yvonne C. Allen, Glenn C. Constant, Brady R. Couvillion
2008, Open-File Report 2008-1320
The southern portion of the Atchafalaya Basin Floodway System (ABFS) is a large area (2,571 km2) in south central Louisiana bounded on the east and west sides by a levee system. The ABFS is a sparsely populated area that includes some of the Nation's most significant extents of bottomland hardwoods,...
Mineralogic Causes of Variations in Magnetic Susceptibility of Late Pleistocene and Holocene Sediment from Great Salt Lake, Utah
Richard L. Reynolds, Joseph G. Rosenbaum, Robert S. Thompson
2008, Open-File Report 2008-1352
We describe here results of magnetic susceptibility (MS) measurements and magnetic mineralogy of sediments sampled in three cores from the south basin of Great Salt Lake. The cores were obtained in 1996 with a Kullenburg-type piston corer at sites in close proximity: core 96-4 at 41 deg 01.00' N, 112...
Uncertainty and sensitivity issues in process-based models of carbon and nitrogen cycles in terrestrial ecosystems
Guy R. Larocque, Jagtar S. Bhatti, A.M. Gordon, N. Luckai, M. Wattenbach, Jinxun Liu, Peng C., P.A. Arp, S. Liu, C.F. Zhang, A Komarov, P. Grabarnik, J. Sun, T. White
A.J. Jakeman, A.A. Voinov, A.E. Rizzoli, S. H. Chen, editor(s)
2008, Book chapter, Developments in integrated environmental assessment
Many process-based models of carbon (C) and nitrogen (N) cycles have been developed for northern forest ecosystems. These models are widely used to evaluate the long-term decisions in forest management dealing with effects like particulate pollution, productivity and climate change. Regarding climate change, one...
Model-data fusion in studies of the terrestrial carbon sink
G.A. Alexandrov, D. Chan, M. Chen, K. Gurney, K Higuchi, A Ito, C.D. Jones, A Komarov, K Mabuchi, D.M. Matross, F Veroustraete, W.W. Verstreten
A.J. Jakeman, A.A. Voinov, A.E. Rizzoli, S. H. Chen, editor(s)
2008, Book chapter, Developments in integrated environmental assessment
Current uncertainty in quantifying the global carbon budget remains a major contributing source of uncertainty in reliably projecting future climate change. Furthermore, quantifying the global carbon budget and characterising uncertainties have emerged as critical to a successful implementation of the United Nations Framework Convention on Climate Change and its Kyoto Protocol. Beyond fundamental quantification, attribution...
Strong tremor near Parkfield, CA, excited by the 2002 Denali Fault earthquake
Zhigang Peng, John E. Vidale, Kenneth C. Creager, Justin L. Rubenstein, Joan S. Gomberg, Paul Bodin
2008, Geophysical Research Letters (35)
We show clear evidence of non-volcanic tremor triggered by 2002 Mw7.8 Denali Fault earthquake near Parkfield. Triggered tremor is identified as bursts of high-frequency (∼2–8 Hz), non-impulsive seismic energy whose envelope is coherent among many stations and has the same periodicity as the passing surface waves. The tremor originates from...
Watershed Regressions for Pesticides (WARP) for Predicting Annual Maximum and Annual Maximum Moving-Average Concentrations of Atrazine in Streams
Wesley W. Stone, Robert J. Gilliom, Charles G. Crawford
2008, Open-File Report 2008-1186
Regression models were developed for predicting annual maximum and selected annual maximum moving-average concentrations of atrazine in streams using the Watershed Regressions for Pesticides (WARP) methodology developed by the National Water-Quality Assessment Program (NAWQA) of the U.S. Geological Survey (USGS). The current effort builds on the original WARP models, which...
Comparison of pumped and diffusion sampling methods to monitor concentrations of perchlorate and explosive compounds in ground water, Camp Edwards, Cape Cod, Massachusetts, 2004-05
Denis R. LeBlanc, Don A. Vroblesky
2008, Scientific Investigations Report 2008-5109
Laboratory and field tests were conducted at Camp Edwards on the Massachusetts Military Reservation on Cape Cod to examine the utility of passive diffusion sampling for long-term monitoring of concentrations of perchlorate and explosive compounds in ground water. The diffusion samplers were constructed of 1-inch-diameter rigid, porous polyethylene tubing. The...
Digital surfaces and thicknesses of selected hydrogeologic units within the Mississippi Embayment Regional Aquifer Study (MERAS)
Rheannon M. Hart, Brian R. Clark, Susan E. Bolyard
2008, Scientific Investigations Report 2008-5098
Digital surfaces of selected Tertiary and younger age hydrogeologic units within the Mississippi embayment aquifer system were created using more than 2,600 geophysical logs for an area that covers approximately 70,000 square miles and encompasses parts of eight states. The digital surfaces were developed to define and display the hydrogeologic...
Geoinformatics 2008 - Data to Knowledge
Shailaja R. Brady, A. Krishna Sinha, Linda C. Gundersen
2008, Scientific Investigations Report 2008-5172
Geoinformatics is the term used to describe a variety of efforts to promote collaboration between the computer sciences and the geosciences to solve complex scientific questions. It refers to the distributed, integrated digital information system and working environment that provides innovative means for the study of the Earth systems, as...
Geologic assessment of undiscovered, technically recoverable coalbed-gas resources in Cretaceous and Tertiary rocks, North Slope, and adjacent state waters, Alaska
Stephen B. Roberts
2008, Data Series 69-S
The purpose of the U.S. Geological Survey's (USGS) National Oil and Gas Assessment is to develop geology-based hypotheses regarding the potential for additions to oil and gas reserves in priority areas of the United States, focusing on the distribution, quantity, and availability of oil and natural gas resources. The USGS...
Bathymetric contour maps for lakes surveyed in Iowa in 2006
S. M. Linhart, K. D. Lund
2008, Scientific Investigations Map 3051
The U.S. Geological Survey, in cooperation with the Iowa Department of Natural Resources, conducted bathymetric surveys on two lakes in Iowa during 2006 (Little Storm Lake and Silver Lake). The surveys were conducted to provide the Iowa Department of Natural Resources with information for the development of total maximum daily...
Heat as a tracer to determine streambed water exchanges
Jim Constantz
2008, Water Resources Research (46)
This work reviews the use of heat as a tracer of shallow groundwater movement and describes current temperature-based approaches for estimating streambed water exchanges. Four common hydrologic conditions in stream channels are graphically depicted with the expected underlying streambed thermal responses, and techniques are discussed for installing and monitoring temperature...
Rank clocks and plant community dynamics
Scott L. Collins, Katherine Suding, Elsa E. Cleland, Michael Batty, Steven C. Pennings, K.L. Gross, James B. Grace, L. Gough, Joe E. Fargione, Christopher M. Clark
2008, Ecology (89) 3534-3541
Summarizing complex temporal dynamics in communities is difficult to achieve in a way that yields an intuitive picture of change. Rank clocks and rank abundance statistics provide a graphical and analytical framework for displaying and quantifying community dynamics. We used rank clocks, in which the rank order abundance for each...
Effects of landscape gradients on wetland vegetation communities: information for large-scale restoration
Christa L. Zweig, Wiley M. Kitchens
2008, Wetlands (28) 1086-1096
Projects of the scope of the restoration of the Florida Everglades require substantial information regarding ecological mechanisms, and these are often poorly understood. We provide critical base knowledge for Everglades restoration by characterizing the existing vegetation communities of an Everglades remnant, describing how present and historic hydrology affect wetland vegetation...
In-situ observations of the physical properties of the Martian surface
Kenneth E. Herkenhoff, M. P. Golombek, E.A. Guinness, J.B. Johnson, A. Kusack, L. Richter, R.J. Sullivan, S. Gorevan
Jim Bell, editor(s)
2008, Book chapter, The martian surface: Composition, mineralogy, and physical properties
The physical properties of rocks and soils on the surface of Mars have been investigated by several landed spacecraft. Studies of these physical properties constrain interpretation of Martian geologic processes and provide engineering data for future mission planning. As on Earth, these properties vary considerably from place to place, and...
Geometric performance comparison between the OLI and the ETM+
James C. Storey, Mike Choate, Kenton Lee
2008, Conference Paper
The Landsat Data Continuity Mission (LDCM) Operational Land Imager (OLI) is the successor to the Landsat 7 Enhanced Thematic Mapper Plus (ETM+) instrument and features a pushbroom architecture that is more geometrically stable than the whiskbroom scanner of the ETM+. As a tradeoff of this architecture selection, imagery must be...
Forewarned is forearmed! Progress in development of the U.S. National Early Detection and Rapid Response System for invasive plants: Proposal for a North American early warning system for invasive plants
Randy G. Westbrooks
2008, Conference Paper, Proceedings of 2008 Weeds Against Borders
Currently, a National Early Detection and Rapid Response System (EDRR) for Invasive Plants is being developed in the United States. Conceptually, the system is a coordinated framework of local, state, and national interagency groups that is designed to prevent the establishment and spread of new invasive plants through early detection...
High-resolution seismic images and seismic velocities of the San Andreas fault zone at Burro Flats, Southern California
C. C. Tsai, Rufus D. Catchings, Mark R. Goldman, Michael J. Rymer, P. Schnurle, H. W. Chen
2008, Bulletin of the Seismological Society of America (98) 2948-2961
To better understand the structure of the San Andreas fault (SAF) at Burro Flats in southern California, we acquired a three-dimensional combined set of seismic reflection and refraction profiles centered on the main active trace at Burro Flats. In this article, we discuss the variation in shallow-depth velocities along each...
Spirit Mars Rover Mission to the Columbia Hills, Gusev Crater: Mission overview and selected results from the Cumberland Ridge to Home Plate
R. E. Arvidson, S. W. Ruff, R.V. Morris, D. W. Ming, L.S. Crumpler, A. S. Yen, S. W. Squyres, R.J. Sullivan, J.F. Bell III, N.A. Cabrol, B. C. Clark, W. H. Farrand, R. Gellert, R. Greenberger, J. A. Grant, E.A. Guinness, Kenneth E. Herkenhoff, J.A. Hurowitz, J. R. Johnson, G. Klingelhoefer, K. W. Lewis, R. Li, T.J. McCoy, J. Moersch, H.Y. McSween, S.L. Murchie, M. Schmidt, Christian Schroeder, A. Wang, S. Wiseman, M.B. Madsen, W. Goetz, S. M. McLennan
2008, Journal of Geophysical Research E: Planets (113)
This paper summarizes the Spirit rover operations in the Columbia Hills of Gusev Crater from sols 513 to 1476 and provides an overview of selected findings that focus on synergistic use of the Athena Payload and comparisons to orbital data. Results include discovery of outcrops (Voltaire) on Husband Hill that...
