Geology and ground-water resources of the Cockfield Formation in western Tennessee
W. S. Parks, J. K. Carmichael
1990, Water-Resources Investigations Report 88-4181
The Cockfield Formation of the Claiborne Group of Tertiary age underlies approximately 4,000 sq mi in western Tennessee. The formation consists primarily of lenticular beds of very fine to coarse sand, silt, clay, and lignite. The Cockfield Formation has been extensively eroded, and the original thickness is preserved only in...
Simulation of ground-water flow in the St Peter aquifer in an area contaminated by coal-tar derivatives, St Louis Park, Minnesota
D. L. Lorenz, J. R. Stark
1990, Water-Resources Investigations Report 90-4150
A model constructed to simulate ground-water flow in part of the Prairie du Chien-Jordan and St. Peter aquifers, St. Louis Park, Minnesota, was used to test hypotheses about the movement of ground water contaminated with coal-tar derivatives and to simulate alternatives for reducing the downgradient movement of contamination in the...
Geohydrology and numerical model analysis of ground-water flow in the Pullman-Moscow area, Washington and Idaho
W. E. Lum II, James L. Smoot, Dale R. Ralston
1990, Water-Resources Investigations Report 89-4103
The geohydrology of the Pullman, Washington-Moscow, Idaho area was investigated by mapping geohydrologic units, determining the distribution of hydraulic head in each unit, and determining some of the components of the water budget. This information was used to construct a three- dimensional groundwater-flow model that incorporates three layers--a surficial loess...
Geologic applications of modern aeromagnetic surveys : proceedings of the U.S. Geological Survey Workshop on Geologic Applications of Modern Aeromagnetic Surveys, held January 6-8, 1987, in Lakewood, Colorado
William F. Hanna, editor(s)
1990, Bulletin 1924
Developments and applications of modern airborne electromagnetic surveys : proceedings of the U.S. Geological Survey Workshop on Developments and Applications of Modern Airborne Electromagnetic Surveys, October 7-9, 1987
David V. Fitterman
1990, Bulletin 1925
Mineral Resources of the Black Mountains North and Burns Spring Wilderness Study Areas, Mohave County, Arizona
James E. Conrad, Randall H. Hill, Robert C. Jachens, John T. Neubert
1990, Bulletin 1737-C
At the request of the U.S. Bureau of Land Management, approximately 19,300 acres of the Black Mountains North Wilderness Study Area (AZ-020-009) and 23,310 acres of the Burns Spring Wilderness Study Area (AZ-02D-010) were evaluated for mineral resources and mineral resource potential. In this report, the area studied is referred...
Mineral Resources of the Wabayuma Peak Wilderness Study Area, Mohave County, Arizona
Clay M. Conway, Jerry R. Hassemer, Daniel H. Knepper, James A. Pitkin, Robert C. Jachens, Mark L. Chatman
1990, Bulletin 1737-E
The Wabayuma Peak Wilderness Study Area (AZ-020-037/043), for which a mineral survey was requested by the U.S. Bureau of land Management, encompasses 40,118 acres in northwestern Arizona. Fieldwork was carried out in 1986-88 by the U.S. Bureau of Mines and the U.S. Geological Survey to appraise the identified (known) resources...
Simulation of ground-water flow in the Mississippi River Valley alluvial aquifer in eastern Arkansas
G.L. Mahon, A. H. Ludwig
1990, Water-Resources Investigations Report 89-4145
The U.S Geological Survey has developed and calibrated a digital model of the flow system in the alluvial aquifer as part of a multiagency Eastern Arkansas Region Comprehensive Study being conducted by the U. S. Army Corps of Engineers. Other cooperating agencies include the U.S. Soil Conservation Service, the Arkansas...
Appraisal of the water resources of the Skunk Creek Aquifer in Minnehaha County, South Dakota
G.L. Ohland
1990, Water-Resources Investigations Report 87-4156
The Skunk Creek aquifer, a major glacial outwash deposit in the Skunk Creek drainage basin, consists of a 30-sq-mi shallow stream connected sand and gravel aquifer in southeastern South Dakota. The aquifer thickness ranges from 1 to 74 ft. Average annual fluctuation of the water table is 2.5 ft. The...
Calibration and sensitivity analysis of a ground-water flow model of the coastal lowlands aquifer system in parts of Louisiana, Mississippi, Alabama, and Florida
Angel Martin Jr., C. D. Whiteman Jr.
1990, Water-Resources Investigations Report 89-4189
Effects of channel modifications on the hydrology of Chicod Creek basin, North Carolina, 1975-87
R.R. Mason Jr., C.E. Simmons, S.A. Watkins
1990, Water-Resources Investigations Report 90-4031
Drainage modifications in this Coastal Plain basin from 1978 to 1981 consisted of channel excavation and clearing of blockages. A study was begun in 1975 to define hydrologic conditions of the basin before, during, and after modifications and to determine what changes were attributed to modifications. Surface-water conditions were altered...
Mineral resources of the Chamisa, Empedrado, and La Lena wilderness Study Areas, Sandoval and McKinley Counties, New Mexico
P.J. Modreski, G.A. Nowlan, W. F. Hanna, R.A. Schreiner
1990, Bulletin 1733-E
Regional evaluation of hydrologic factors and effects of pumping, St Peter-Jordan aquifer, Iowa
M. R. Burkart, Robert Buchmiller
1990, Water-Resources Investigations Report 90-4009
The St. Peter-Jordan aquifer includes the Cambrian Jordan Sandstone and the overlying Ordovician Prairie du Chien Group and St. Peter Sandstone. The aquifer is present throughout Iowa and is confined beneath other aquifers in much of the State. Information on the aquifer available from drillers and contractors, provided estimates of...
Effects of urbanization on peak streamflows in four Connecticut communities, 1980-84
L.A. Weiss
1990, Water-Resources Investigations Report 89-4167
Ratios of peak flows in urban basins to peak flows in rural basins in Connecticut are about 1.5 to 6.1 for the 2-year flood and 1.1 to 4.3 for the 100-year flood. The lower ratios, in each case, apply where 30% of the area is served by storm sewers, and...
A conceptual weather-type classification procedure for the Philadelphia, Pennsylvania, area
Gregory J. McCabe
1990, Water-Resources Investigations Report 89-4183
A simple method of weather-type classification, based on a conceptual model of pressure systems that pass through the Philadelphia, Pennsylvania, area, has been developed. The only inputs required for the procedure are daily mean wind direction and cloud cover, which are used to index the relative position of pressure systems...
Geothermal resources of the western arm of the Black Rock Desert, northwestern Nevada: Part II, aqueous geochemistry and hydrology
A. H. Welch, A. M. Preissler
1990, Water-Resources Investigations Report 87-4062
The western arm of the Black Rock Desert, Nevada, includes several distinct hydrothermal systems, some of which exceed 150 C and may exceed 200 C at depth, determined on the basis of chemical geothermometry. The cation composition of the thermal water appears to be controlled by aluminosilicate minerals that are...
Effects of storm-water runoff on local ground-water quality, Clarksville, Tennessee
Anne B. Hoos
1990, Water-Resources Investigations Report 90-4044
Storm-related water-quality data were collected at a drainage-well site and at a spring site in Clarksville, Tennessee, to define the effects of storm-water runoff on the quality of ground water in the area. A dye-trace test verified the direct hydraulic connection between the drainage well and Mobley Spring. Samples of...
Assessing the response of Emerald Lake, an alpine watershed in Sequoia National Park, California, to acidification during snowmelt by using a simple hydrochemical model
R. P. Hooper, C.T. West, N.E. Peters
1990, Water-Resources Investigations Report 90-4000
Geochemistry of batch-extract waters derived from spoil material collected at the Cordero coal mine, Powder River basin, Wyoming
D. L. Naftz
1990, Water-Resources Investigations Report 87-4200
Batch-mixing experiments to evaluate postmining water quality at the Cordero Mine were conducted by the U.S. Geological Survey during 1984 to 1985. Contact of groundwater from the spoil aquifer with fresh spoil material caused only small changes in major-element concentrations and in pH, unless sulfide oxidation or contact with soluble...
PRECONDITIONED CONJUGATE-GRADIENT 2 (PCG2), a computer program for solving ground-water flow equations
Mary C. Hill
1990, Water-Resources Investigations Report 90-4048
This report documents PCG2 : a numerical code to be used with the U.S. Geological Survey modular three-dimensional, finite-difference, ground-water flow model . PCG2 uses the preconditioned conjugate-gradient method to solve the equations produced by the model for hydraulic head. Linear or nonlinear flow conditions may be simulated. PCG2 includes...
Effects of present and projected ground-water withdrawals on the Twin Cities aquifer system, Minnesota
Michael Schoenberg
1990, Water-Resources Investigations Report 90-4001
The Twin Cities aquifer system in Minnesota contains 5 aquifers and 4 confining units composed of 14 stratigraphic units. Bedrock aquifers consist of friable sandstones and highly fractured carbonate rocks; aquifers in the glacial drift consist of outwash and alluvium. From 1880 to 1980, groundwater withdrawals had caused long-term declines...
Geology, geochemistry, and mineralogy of the Ridenour Mine breccia pipe, Arizona
K. J. Wenrich, E.R. Verbeek, H. B. Sutphin, P.J. Modreski, B. S. Van Gosen, D.E. Detra
1990, Open-File Report 90-504
Fractal properties of tremor and gas piston events observed at Kilauea Volcano, Hawaii
B. Chouet, H. R. Shaw
1990, Journal of Geophysical Research (96) 10177-10189
Studies the fractal properties of shallow volcanic tremor and gas piston events associated with magma degassing at Kilauea Volcano, Hawaii, using data from two dense short-baseline arrays of seismographs deployed near the active crater of Puu Oo on the east rift of the volcano. The existence of a categorically stable...
Predicting the vertical structure of tidal current and salinity in San Francisco Bay, California
Michael Ford, Jia Wang, Ralph T. Cheng
1990, Water Resources Research (26) 1027-1045
A two-dimensional laterally averaged numerical estuarine model is developed to study the vertical variations of tidal hydrodynamic properties in the central/north part of San Francisco Bay, California. Tidal stage data, current meter measurements, and conductivity, temperature, and depth profiling data in San Francisco Bay are used for comparison with model...
Complex interactions among light-reducing variables in seagrass systems: Simulation model predictions for long-term community stability
Hilary A. Neckles
1990, Conference Paper, The light requirements of seagrasses: Results and recommendations of a workshop
No abstract available....
