Numerical simulation of a plume of brackish water in the Biscayne Aquifer originating from a flowing artesian well, Dade County, Florida
Michael L. Merritt
1996, Water Supply Paper 2464
A computer model that simulates a plume of brackish water in the Biscayne Aquifer has been developed. Simulations showed the remnant plume moving generally south-southeastward after 1985 and gradually dissipating. The plume of brackish water (originating from a well drilled in 1944) will be completely dispersed between 1994 and 2003....
Dissolved oxygen in the Tualatin River, Oregon, during winter flow conditions, 1991 and 1992
V.J. Kelly
1996, Open-File Report 95-451
Throughout the winter period, November through April, wastewater treatment plants in the Tualatin River Basin discharge from 10,000 to 15,000 pounds per day of biochemical oxygen demand to the river. These loads often increase substantially during storms when streamflow is high. During the early winter season, when streamflow is frequently...
Summary of the land-use inventory for the nonpoint-source evaluation monitoring watersheds in Wisconsin
J.A. Wierl, K.F. Rappold, F.U. Amerson
1996, Open-File Report 96-123
In 1992, the Wisconsin Department of Natural Resources (WDNR) in cooperation with the U.S. Geological Survey initiated a land-use inventory to identify sources of pollutants and track the land-management changes for eight evaluation monitoring watersheds established as part of the WDNR's Nonpoint Source Program. Each evaluation monitoring watershed is within...
Digital elevation model (DEM) file of topographic elevations for the Death Valley region of southern Nevada and southeastern California processed from U.S. Geological Survey 1-degree Digital Elevation Model data files
A. K. Turner, F. A. D’Agnese, Claudia C. Faunt
1996, Open-File Report 95-287
Resource assessment of the Bureau of Land Management's Winnemucca District and Surprise Resource Area, Northwest Nevada and Northeast California; geochemical analysis and thermochronologic modeling to evaluate conceptual petroleum plays
C.E. Barker
1996, Open-File Report 96-51
Evaluation of the Surface-Water Quantity, Surface-Water Quality, and Rainfall Data-Collection Programs in Hawaii, 1994
Richard A. Fontaine
1996, Water-Resources Investigations Report 95-4212
This report documents the results of an evaluation of the surface-water quantity, surface-water quality, and rainfall data-collection programs in Hawaii. Fourteen specific issues and related goals were identified for the surface-water quantity program and a geographic information systems (GIS) data base was developed summarizing information for all surface-water stream gages...
Uncertainty analysis of the simulations of effects of discharging treated wastewater to the Red River of the North at Fargo, North Dakota, and Moorhead, Minnesota
Edwin A. Wesolowski
1996, Water-Resources Investigations Report 96-4015
Two separate studies to simulate the effects of discharging treated wastewater to the Red River of the North at Fargo, North Dakota, and Moorhead, Minnesota, have been completed. In the first study, the Red River at Fargo Water-Quality Model was calibrated and verified for icefree conditions. In the second study,...
Kangaroo rat bone compared to white rat bone after short-term disuse and exercise
E. Muths, O. J. Reichman
1996, Comparative Biochemistry and Physiology, Part A: Physiology (114) 355-361
Kangaroo rats (Dipodomys ordii) were used to study the effects of confinement on mechanical properties of bone with a long range objective of proposing an alternative to the white rat model for the study of disuse osteoporosis. Kangaroo rats exhibit bipedal locomotion, which subjects their limbs to substantial accelerative forces...
Development and evaluation of sediment quality guidelines for Florida coastal waters
Donald D. MacDonald, R. Scott Carr, Fred D. Calder, Edward R. Long, Christopher G. Ingersoll
1996, Ecotoxicology (5) 253-278
The weight-of-evidence approach to the development of sediment quality guidelines (SQGs) was modified to support the derivation of biological effects-based SQGs for Florida coastal waters. Numerical SQGs were derived for 34 substances, including nine trace metals, 13 individual polycyclic aromatic hydrocarbons (PAHs), three groups of PAHs, total polychlorinated biphenyls (PCBs),...
The Amazon-Laurentian connection as viewed from the Middle Proterozoic rocks in the central Andes, western Bolivia and northern Chile
R. M. Tosdal
1996, Tectonics (15) 827-842
Middle Proterozoic rocks underlying the Andes in western Bolivia, western Argentina, and northern Chile and Early Proterozoic rocks of the Arequipa massif in southern Perú form the Arequipa-Antofalla craton. These rocks are discontinuously exposed beneath Mesozoic and Cenozoic rocks, but abundant crystalline clasts in Tertiary sedimentary rocks in the western...
The Topography of Asteroid Ida: A Comparison between Photogrammetric and ShapeForm-Shading Image Analysis
Bernd Giese, Juergen Oberst, Randolph L. Kirk, W. Zeitler
1996, Conference Paper, Proceedings of XVIIIth ISPRS Congress Technical Commission III: Theory and Algorithms
We derived high resolution Digital Terrain Models from stereo images of the asteroid Ida that were obtained by the Galileo spacecraft during the flyby in August 1993 and compared these results with terrain models derived from two-dimensional photoclinometry. The comparison shows that there are striking discrepancies between the results from...
Application of enzyme-linked immunosorbent assay for measurement of polychlorinated biphenyls from hydrophobic solutions: Extracts of fish and dialysates of semipermeable membrane devices: Chapter 26
James L. Zajicek, Donald E. Tillitt, James N. Huckins, Jimmie D. Petty, Michael E. Potts, David A. Nardone
1996, Book chapter, Environmental Immunochemical Methods
Determination of PCBs in biological tissue extracts by enzyme-linked immunosorbent assays (ELISAs) can be problematic, since the hydrophobic solvents used for their extraction and isolation from interfering biochemicals have limited compatibility with the polar solvents (e.g. methanol/water) and the immunochemical reagents used in ELISA. Our studies of these solvent effects...
Hydrothermal alteration mineralogy of SOH drill holes, Kilauea East Rift Zone geothermal area, Hawaii
Keith E. Bargar, Terry E.C. Keith, Frank A. Trusdell, S.R. Evans, M.L. Sykes
1996, Open-File Report 96-10
Thirty-eight hydrothermal minerals were identified from 356 drill-core specimens that were obtained from three Scientific Observation Holes (SOH-1, SOH-2, and SOH-4) drilled along the lower East Rift Zone (ERZ) of Kilauea Volcano, Hawaii. The minerals formed during alteration of basaltic rocks and glass by hot, circulating, waters in aquifers consisting...
Floods, runoff, and snowpack in Utah, 1995
D.V. Allen
1996, Fact Sheet 106-96
Utah, like other States in the western United States, has experienced several rapid and extreme changes between wet and dry precipitation cycles during recent years. During the 1995 water year (October 1994 to September 1995), most areas of Utah experienced greater-than-normal precipitation (1961-90), which was reflected in greater-than-average snowpack, moderate...
Numerical model analysis of the effects of ground-water withdrawals on discharge to streams and springs in small basins typical of the Puget Sound Lowland, Washington
D. S. Morgan, J. L. Jones
1996, Open-File Report 95-470
A numerical ground-water flow model of a hypothetical basin was constructed and used to investigate the effects of ground-water withdrawals on rates of natural discharge to streams and springs in small basins of the Puget Sound Lowland. Definitions of the topography, geology, drainage, and climate of the hypothetical basin were...
Rainbow trout embryotoxicity of a complex contaminant mixture extracted from Lake Michigan lake trout
Penelope J. Wilson, D. E. Tillitt
1996, Marine Environmental Research (42) 129-134
Persistent Hydrophobic contaminants such as poly chlorinated dibenzo-p-dioxins, dibenzofurans and biphenyl congeners are present in aquatic systems, and are known to produce adverse effects in fish. Reproductive failure in fish populations has been observed in aquatic systems contaminated with persistent hydrophobic compounds. In order to mimic maternal transfer of environmental...
The roles of organic matter in the formation of uranium deposits in sedimentary rocks
Charles S. Spirakis
1996, Ore Geology Reviews (11) 53-69
Because reduced uranium species have a much smaller solubility than oxidized uranium species and because of the strong association of organic matter (a powerful reductant) with many uranium ores, reduction has long been considered to be the precipitation mechanism for many types of uranium deposits. Organic matter may also be...
Magma transport and metasomatism in the mantle; a critical review of current geochemical models; reply
Jane E. Nielson, Howard G. Wilshire
1996, American Mineralogist (81) 760-765
Navon et al. (1996) demonstrated that the Navon and Stolper (1987) model can be formulated to reproduce a pattern of light-ion lithophile trace element (LIL) enrichments produced by a single, small-scale metasomatic process recorded in a composite xenolith from Dish Hill, California (Nielson et al. 1993). The Navon and Stolper...
Patterns of late Cenozoic volcanic and tectonic activity in the West Antarctic rift system revealed by aeromagnetic surveys
John C. Behrendt, R. Saltus, D. Damaske, A. McCafferty, C. A. Finn, D. Blankenship, R.E. Bell
1996, Tectonics (15) 660-676
Aeromagnetic surveys, spaced ≤5 km, over widely separated areas of the largely ice- and sea-covered West Antarctic rift system, reveal similar patterns of 100- to 1700-nT, shallow-source magnetic anomalies interpreted as evidence of extensive late Cenozoic volcanism. We use the aeromagnetic data to extend the volcanic rift interpretation over West...
Hydrogeology and potential effects of changes in water use, Carson Desert agricultural area, Churchill County, Nevada
Douglas K. Maurer, Ann K. Johnson, Alan H. Welch
1996, Water Supply Paper 2436
Operating Criteria and Procedures for Newlands Project irrigation and Public Law 101-618 could result in reductions in surface water used for agriculture in the Carson Desert, potentially affecting ground-water supplies from shallow, intermediate, and basalt aquifers. A near-surface zone could exist at the top of the shallow aquifer near the...
Procedures for estimating unit hydrographs for large floods at ungaged sites in Montana
Stephen R. Holnbeck, Charles Parrett
1996, Water Supply Paper 2420
Flood hydrographs for 26 gaging stations and rainfall data were used together with a rainfall-runoff simulation model to derive unit hydrographs and important unit-hydrograph variables. Methods were developed for estimating unit hydrographs at ungaged sites using either the Clark or dimensionless unit-hydrograph methods. The 26 derived unit hydrographs were compared...
Ecosystem management: A decision support GIS approach
Wei Ji
1996, Conference Paper, IGARSS '96. 1996 International Geoscience and Remote Sensing Symposium
This paper describes a new approach using decision support GIS for handling information in ecosystem management. Technical research efforts resulted in specialized spatial decision support systems for wetland restoration planning, wetland permit analysis, and wildlife research and management. These applications are briefly presented to illustrate the usage of the methodology....
Development of the temporal transportation database for the analysis of urban development in the Baltimore-Washington region
Susan C. Clark, John Starr, Timothy W. Foresman, William Acevedo, Carol Solomon
1996, Conference Paper, ASPRS/ACSM Annual Convention and Exhibition, Baltimore, Md., 20–26 April 1996, Proceedings
The U.S. Geological Survey is participating in a joint effort with the University of Maryland Baltimore County and other government agencies to construct a dynamic database of urban development for the Baltimore-Washington region from the late-1700's to the 1990's. The multi-theme temporal database includes a principal transportation data layer that...
Origins and philosophy of building a temporal database to examine human transformation processes
William Acevedo, Timothy W. Foresman, Janis T. Buchanan
1996, Conference Paper, Annual Convention and Exhibition, Baltimore, Md., 22–25 April 1996, Proceedings
The U.S. Geological Survey (USGS), in partnership with the University of Maryland Baltimore County, is using historical maps and satellite images to map human-induced land transformations for the Baltimore-Washington metropolitan area. This work builds on an earlier effort that documented the historical urban development for the San Francisco Bay area....
Uncertainty of groundwater vulnerability assessments for agricultural regions in Hawaii: Review
Keith Loague, R. L. Bernknopf, R. E. Green, T. W. Giambelluca
1996, Journal of Environmental Quality (25) 475-490
There are important challenges associated with assessing potential groundwater vulnerability hazards that may result from regional scale applications of agrochemicals. The increasing availability of Geographic Information System (GIS) software to those involved in assisting with landuse decisions has resulted in the widespread production of multicolored risk management maps for many...
