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Page 1088, results 27176 - 27200

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Delineation of Areas Contributing Water to the Dry Brook Public-Supply Well, South Hadley, Massachusetts
Stephen P. Garabedian, Janet Radway Stone
2004, Water-Resources Investigations Report 2003-4320
Areas contributing water to the Dry Brook public-supply well in South Hadley, Massachusetts, were delineated with a numerical ground-water-flow model that is based on geologic and hydrologic information for the confined sand and gravel aquifer pumped by the supply well. The study area is along the Connecticut River in central...
Incorporating uncertainty into mercury-offset decisions with a probabilistic network for National Pollutant Discharge Elimination System permit holders: An interim report
Alexander Wood
2004, Open-File Report 2004-1408
This interim report describes an alternative approach for evaluating the efficacy of using mercury (Hg) offsets to improve water quality. Hg-offset programs may allow dischargers facing higher-pollution control costs to meet their regulatory obligations by making more cost effective pollutant-reduction decisions. Efficient Hg management requires methods to translate that science...
Eolian Dust and the Origin of Sedimentary Chert
C. Blaine Cecil
2004, Open-File Report 2004-1098
This paper proposes an alternative model for the primary source of silica contained in bedded sedimentary chert. The proposed model is derived from three principal observations as follows: (1) eolian processes in warm-arid climates produce copious amounts of highly reactive fine-grained quartz particles (dust), (2) eolian processes in warm-arid...
Simulation of Integrated Surface-Water/Ground-Water Flow and Salinity for a Coastal Wetland and Adjacent Estuary
Christian D. Langevin, Eric D. Swain, Wolfert Melinda A.
2004, Open-File Report 2004-1097
The SWIFT2D surface-water flow and transport code, which solves the St. Venant equations in two dimensions, was coupled with the SEAWAT variable-density ground-water code to represent hydrologic processes in coastal wetlands and adjacent estuaries. The integrated code was applied to the southern Everglades of Florida to quantify flow and salinity...
Characterization and simulation of flow in the lower Arkansas River alluvial aquifer, south-central Kansas
Xiaodong Jian, Lanna J. Combs, Cristi V. Hansen
2004, Scientific Investigations Report 2004-5204
Large parts of the lower Arkansas, Ninnescah, and Walnut River Basins in south-central Kansasan area that includes Wichita, the largest city in Kansasare experiencing rapid population growth and, consequently, increasing demands on surface- and ground-water resources in addition to agricultural irrigation in the area. The quantity and quality of water...
PHAST--a program for simulating ground-water flow, solute transport, and multicomponent geochemical reactions
David L. Parkhurst, Kenneth L. Kipp, Peter Engesgaard, Scott R. Charlton
2004, Techniques and Methods 6-A8
The computer program PHAST simulates multi-component, reactive solute transport in three-dimensional saturated ground-water flow systems. PHAST is a versatile ground-water flow and solute-transport simulator with capabilities to model a wide range of equilibrium and kinetic geochemical reactions. The flow and transport calculations are based on a modified version of HST3D...
SutraGUI, a graphical-user interface for SUTRA, a model for ground-water flow with solute or energy transport
Richard B. Winston, Clifford I. Voss
2004, Open-File Report 2003-285
This report describes SutraGUI, a flexible graphical user-interface (GUI) that supports two-dimensional (2D) and three-dimensional (3D) simulation with the U.S. Geological Survey (USGS) SUTRA ground-water-flow and transport model (Voss and Provost, 2002). SutraGUI allows the user to create SUTRA ground-water models graphically. SutraGUI provides all of the graphical functionality required...
Historic topographic sheets to satellite imagery—A methodology for evaluating coastal change in Florida's Big Bend tidal marsh
Ellen A. Raabe, Amy E. Streck, Richard P. Stumpf
2004, Open-File Report 2002-211
This open-file report details the methodology used to rectify, digitize, and mosaic nineteen 19th century topographic sheets on the marsh-dominated Big Bend Gulf coast of Florida. Historic charts of tidal marshes in Florida's Big Bend were prepared in a digital grid-based format for comparison with modern features derived from 1995...
Coefficients of productivity for Yellowstone's grizzly bear habitat
David John Mattson, Kim Barber, Ralene Maw, Roy Renkin
2004, Biological Science Report 2002-0007
This report describes methods for calculating coefficients used to depict habitat productivity for grizzly bears in the Yellowstone ecosystem. Calculations based on these coefficients are used in the Yellowstone Grizzly Bear Cumulative Effects Model to map the distribution of habitat productivity and account for the impacts of human facilities. The...
Thickness of Santa Fe Group sediments in the Espanola Basin south of Santa Fe, New Mexico, as estimated from aeromagnetic data
Jeffrey D. Phillips, V. J. S. Grauch
2004, Open-File Report 2004-1354
In the southern Espa?ola basin south of Santa Fe, New Mexico, weakly magnetic Santa Fe Group sediments of Oligocene to Pleistocene age, which represent the primary aquifers for the region, are locally underlain by moderately to strongly magnetic igneous and volcaniclastic rocks of Oligocene age. Where this relationship exists, the...
Load estimator (LOADEST): a FORTRAN program for estimating constituent loads in streams and rivers
Robert L. Runkel, Charles G. Crawford, Timothy A. Cohn
2004, Techniques and Methods 4-A5
LOAD ESTimator (LOADEST) is a FORTRAN program for estimating constituent loads in streams and rivers. Given a time series of streamflow, additional data variables, and constituent concentration, LOADEST assists the user in developing a regression model for the estimation of constituent load (calibration). Explanatory variables within the regression model include...
Seismic response analysis of a 13-story steel moment-framed building in Alhambra, California
Janise E. Rodgers, Ahmet K. Sanli, Mehmet Çelebi
2004, Open-File Report 2004-1338
The seismic performance of steel moment-framed buildings has been of particular interest since brittle fractures were discovered at the beam-column connections of some frames following the M6.7 1994 Northridge earthquake. This report presents an investigation of the seismic behavior of an instrumented 13-story steel moment frame building located in the...
Atlas of depth-duration frequency of precipitation annual maxima for Texas
William H. Asquith, Meghan C. Roussel
2004, Scientific Investigations Report 2004-5041
Ninety-six maps depicting the spatial variation of the depth-duration frequency of precipitation annual maxima for Texas are presented. The recurrence intervals represented are 2, 5, 10, 25, 50, 100, 250, and 500 years. The storm durations represented are 15 and 30 minutes; 1, 2, 3, 6, and 12 hours; and...
Physical stream habitat dynamics in Lower Bear Creek, northern Arkansas
Joanna M. Reuter, Robert B. Jacobson, Caroline M. Elliott
2003, Biological Science Report 2003-0002
We evaluated the roles of geomorphic and hydrologic dynamics in determining physical stream habitat in Bear Creek, a stream with a 239 km2 drainage basin in the Ozark Plateaus (Ozarks) in northern Arkansas. During a relatively wet 12-month monitoring period, the geomorphology of Bear Creek was altered by a...
Hydrology and simulation of ground-water flow in Kamas Valley, Summit County, Utah
L.E. Brooks, Bernard J. Stolp, L.E. Spangler
2003, Technical Publication 117
Kamas Valley, Utah, is located about 50 miles east of Salt Lake City and is undergoing residential development. The increasing number of wells and septic systems raised concerns of water managers and prompted this hydrologic study. About 350,000 acre-feet per year of surface water flows through Kamas Valley in the...
Lessons from the fires of 2000: Post-fire heterogeneity in ponderosa pine forests
Natasha B. Kotliar, Sandra L. Haire, Carl H. Key
Phillip N. Omni, Linda A. Joyce, editor(s)
2003, Conference Paper, Fire, Fuel Treatments, and Ecological Restoration: Conference Proceedings: RMRS-P-29
We evaluate burn-severity patterns for six burns that occurred in the southern Rocky Mountains and the Colorado Plateau in 2000. We compare the results of two data sources: Burned Area Rehabilitations Teams (BAER) and a spatial burnseverity model derived from satellite imagery (the Normalized Burn Ratio; NBR). BAER maps tended...