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Estimation of nutrient and suspended-sediment loads in the Patuxent River basin, Maryland, water years 1986-90
S. D. Preston, R.M. Summers
1997, Water-Resources Investigations Report 96-4175
Water-quality data collected at stream sites in the Patuxent River Basin from 1986 through 1990 were used to estimate loads of nutrients and otherconstituents. Studies were performed to determine the adequacy of the water-quality data for load estimation and to evaluate load estimation methods.A regression-based estimator...
Computer simulation of vasectomy for wolf control
R.G. Haight, L. David Mech
1997, Journal of Wildlife Management (61) 1023-1031
Recovering gray wolf (Canis lupus) populations in the Lake Superior region of the United States are prompting state management agencies to consider strategies to control population growth. In addition to wolf removal, vasectomy has been proposed. To predict the population effects of different sterilization and removal strategies, we developed a...
Can the global carbon budget be balanced?
Helaine W. Markewich, Norman B. Bliss, Robert F. Stallard, Eric T. Sundquist
1997, Fact Sheet 137-97
The Mississippi Basin Carbon Project of the U.S. Geological Survey (USGS) is an effort to examine interactions between the global carbon cycle and human-induced changes to the land surface, such as farming and urbanization. Investigations in...
Spring feeding on ungulate carcasses by grizzly bears in Yellowstone National Park
Gerald I. Green, David J. Mattson, James M. Peek
1997, Journal of Wildlife Management (61) 1040-1055
We studied the spring use of ungulate carcasses by grizzly bears (Ursus arctos horribilis) on ungulate winter ranges in Yellowstone National Park. We observed carcasses and bear tracks on survey routes that were travelled biweekly during spring of 1985-90 in the Firehole-Gibbon winter range and spring of 1987-90 in the...
Vulnerability of ground water to atrazine leaching in Kent County, Michigan
D. J. Holtschlag, C. L. Luukkonen
1997, Water-Resources Investigations Report 96-4198
A steady-state model of pesticide leaching through the unsaturated zone was used with readily available hydrologic, lithologic, and pesticide characteristics to estimate the vulnerability of the near-surface aquifer to atrazine contamination from non-point sources in Kent County, Michigan. The modelcomputed fraction of atrazine remaining at the water table, RM, was...
Gravity data of Nevada
David A. Ponce
1997, Data Series 42
Gravity data for the entire state of Nevada and adjacent parts of California, Utah, and Arizona are available on this CD-ROM. About 80,000 gravity stations were compiled primarily from the National Geophysical Data Center and the U.S. Geological Survey. Gravity data was reduced to the Geodetic Reference System of 1967...
Effects of uranium-mining releases on ground-water quality in the Puerco River Basin, Arizona and New Mexico
Peter C. Van Metre, Laurie Wirt, T. J. Lopes, S.A. Ferguson
1997, Water Supply Paper 2476
Shallow ground water beneath the Puerco River of Arizona and New Mexico was studied to determine the effects of uranium-mining releases on water quality. Ground-water samples collected from 1989 to 1991 indicate that concentrations of dissolved uranium have decreased. Most samples from the alluvial aquifer downstream from Gallup, New Mexico,...
A comparison of wetland tree growth response to hydrologic regime in Louisiana and South Carolina
Bobby D. Keeland, William Conner, Rebecca R. Sharitz
1997, Forest Ecology and Management (90) 237-250
Numerous investigations have examined the growth of wetland tree species under a variety of hydrologic conditions. Most studies have compared flooded versus non-flooded conditions in greenhouses or in one to a few field sites near each other or within the same region. Comparisons of wetland tree growth among widely separated...
Defining the temporal and geographic limits for an urban mapping study
Janis Taylor Buchanan, William Acevedo
1997, Conference Paper, Acting locally, connecting globally, Annual Conference, Toronto, Canada, 19–23 July 1997, Paper and Abstracts
Urban mapping research has demonstrated that historic maps can be integrated with remotely sensed data and related geographic information to successfully detect changing urban land characteristics for large metropolitan areas. Effective and efficient temporal mapping requires that procedures be defined for selecting the temporal range and geographic extent of a...
Review of electric and magnetic fields accompanying seismic and volcanic activity
M.J.S. Johnston
1997, Surveys in Geophysics (18) 441-476
New observations of magnetic, electric and electromagnetic field variations, possibly related to recent volcanic and seismic events, have been obtained on Mt. Unzen in Japan, Reunion Island in Indian Ocean, the Long Valley volcanic caldera in California, and for faults in China and Russia, California and several other locations. For...
Population analysis of faint galaxies with mixture modeling
Timothy N. Titus, Earl J. Spillar, Paul Johnson
1997, Astronomical Journal (114) 958-964
We investigate the use of spectral mixture modeling to decompose the integrated spectra of several galaxies. This technique uses a linear combination of template spectra to model over 93% of the variance in Kennicutt's sample of galaxy spectra. One result of our model is a stellar population parameter for each...
A SAS® code to correct for non-normality and non-constant variance in regression and anova models using the box-cox method of power transormation
Ziad A. Malaeb
1997, Environmental Monitoring and Assessment (47) 255-273
A computer program written in SAS ® code for the Box–Cox family of power transformations is presented. The purpose of the program is to suggest a power transformation for the positive continuous response variables in only regression and ANOVA models. A brief overview of data transformation in regression and analysis...
Computation of the time-varying flow rate from an artesian well in central Dade County, Florida, by analytical and numerical simulation methods
Michael L. Merritt
1997, Water Supply Paper 2491
Simulation modeling techniques can by used advantageously in estimating artesian flow rates of wells in the upper Floridan Aquifer or for estimating transmissivity based in measured flow rates. The generalized aquifer model was useful in testing conceptual models of the relation between the various aquifers and confining layers beneath the...
Evaluation of the potential for debris and hyperconcentrated flows in Capulin Canyon as a result of the 1996 Dome fire, Bandelier National Monument, New Mexico
Susan H. Cannon
1997, Open-File Report 97-136
The Dome fire of April 1996 burned 6684 ha in Bandelier National Monument and the adjacent Sante Fe National Forest. The potential for significant debris- and hyperconcentrated-flow activity in Capulin Canyon is evaluated through 1) a systematic consideration of geologic and geomorphic factors that characterize the condition of the hillslope...
Volcano hazards in the Mount Hood region, Oregon
W. E. Scott, T.C. Pierson, S. P. Schilling, J. E. Costa, C. A. Gardner, J.W. Vallance, J. J. Major
1997, Open-File Report 97-89
Mount Hood is a potentially active volcano close to rapidly growing communities and recreation areas. The most likely widespread and hazardous consequence of a future eruption will be for lahars (rapidly moving mudflows) to sweep down the entire length of the Sandy (including the Zigzag) and White River valleys. Lahars...
Water-quality and hydrogeologic data used to evaluate the effects of farming systems on ground-water quality at the Management Systems Evaluation Area near Princeton, Minnesota, 1991-95
M.K. Landon, G. N. Delin, K.J. Nelson, C.P. Regan, J.A. Lamb, S.J. Larson, P. D. Capel, J. L. Anderson, R.H. Dowdy
1997, Open-File Report 97-22
The Minnesota Management Systems Evaluation Area (MSEA) project was part of a multi-scale, inter-agency initiative to evaluate the effects of agricultural management systems on water quality in the midwest corn belt. The research area was located in the Anoka Sand Plain about 5 kilometers southwest of Princeton, Minnesota. The ground-water-quality...
Reconnaissance of 17 beta-estradiol, 11-ketotestosterone, vitellogenin, and gonad histopathology in common carp of United States streams; potential for contaminant-induced endocrine disruption
Steven L. Goodbred, Robert J. Gilliom, Timothy S. Gross, Nancy P. Denslow, Wade B. Bryant, Trenton R. Schoeb
1997, Open-File Report 96-627
A reconnaissance of sex steroid hormones and other biomarkers in common carp was used to assess whether endocrine disruption may be occurring in fish in United States streams, to evaluate relations between endocrine disruption and contaminant levels, and to determine requirements for further studies. 17?-estradiol, 11-ketotestosterone, vitellogenin, and gonadal histopathology...
Hydrogeologic facies characterization of an alluvial fan near Fresno, California, using geophysical techniques
Karen R. Burow, G.S. Weissmann, R. D. Miller, Gary Placzek
1997, Open-File Report 97-46
DBCP (1,2-dibromo-3-chloropropane) contamination in the sole source aquifer near Fresno, California, has significantly affected drinking-water supplies. Borehole and surface geophysical data were integrated with borehole textural data to characterize the Kings River alluvial fan sediments and to provide a framework for computer modeling of pesticide transport in ground water. Primary...
Geologic framework of the Edwards Aquifer and upper confining unit, and hydrogeologic characteristics of the Edwards Aquifer, south-central Uvalde County, Texas
Allan K. Clark, Ted A. Small
1997, Water-Resources Investigations Report 97-4094
The stratigraphic units of the Edwards aquifer in south-central Uvalde County generally are porous and permeable. The stratigraphic units that compose the Edwards aquifer in south-central Uvalde County are the Devils River Formation in the Devils River trend; and the West Nueces, McKnight, and Salmon Peak Formations in the Maverick...