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Page 484, results 12076 - 12100

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Paleohydrology of the Anadarko Basin, central United States
Donald G. Jorgensen
1989, Book chapter, Anadarko Basin symposium (Circular 90)
Geohydrologic systems in the Anadarko basin in the central United States are controlled by topography, climate, geologic structures, and aquifer hydraulic properties, all of which are the result of past geologic and hydrologic processes, including tectonics and diagenesis. From Late Cambrian through Middle Ordovician time, a generally transgressive but cyclic...
Resident research associateships, postdoctoral research awards 1989: opportunities for research at the U.S. Geological Survey, U.S. Department of the Interior
Water Resources Division, U.S. Geological Survey, U.S. National Research Council
1989, Report
The scientists of the U.S. Geological Survey are engaged in a wide range of geologic, geophysical, geochemical, hydrologic, and cartographic programs, including the application of computer science to them. These programs offer exciting possibilities for scientific achievement and professional growth to young scientists through participation as Research Associates....
Recent increases in atmospheric deposition of mercury to North-Central Wisconsin lakes inferred from sediment analyses
R.G. Rada, J.G. Wiener, M.R. Winfrey, D.E. Powell
1989, Archives of Environmental Contamination and Toxicology (18) 175-181
Profiles of total mercury (Hg) concentrations in sediments were examined in 11 lakes in north-central Wisconsin having a broad range of pH (5.1 to 7.8) and alkalinity (-12 to 769 μeq/L). Mercury concentrations were greatest in the top 15 cm of the cores and were much lower...
Diel drift of Chironomidae larvae in a pristine Idaho mountain stream
L. J. Tilley
1989, Hydrobiologia (174) 133-149
Simultaneous hourly net collections in a meadow and canyon reach of a mountain stream determined diel and spatial abundances of drifting Chironomidae larvae. Sixty-one taxa were identified to the lowest practical level, 52 in the meadow and 41 in the canyon. Orthocladiinae was the most abundant subfamily with 32 taxa...
Seepage through a hazardous-waste trench cover
R. W. Healy
1989, Journal of Hydrology (108) 213-234
Water movement through a waste-trench cover under natural conditions at a low-level radioactive waste disposal site in northwestern Illinois was studied from July 1982 to June 1984, using tensiometers, a moisture probe, and meteorological instruments. Four methods were used to estimate seepage: the Darcy, zero-flux plane, surface-based water-budget, and groundwater-based...
An analysis of trichloroethylene movement in groundwater at Castle Air Force Base, California
L. Avon, J.D. Bredehoeft
1989, Journal of Hydrology (110) 23-50
A trichloroethylene (TCE) plume has been identified in the groundwater under a U.S. Air Force Base in the Central Valley of California. An areal, two-dimensional numerical solute transport model indicates that the movement of TCE due to advection, dispersion, and linear sorption is simulated over a 25-year historic period. The...
Effects of variations in recharge on groundwater quality
Donald O. Whittemore, K.M. McGregor, G.A. Marotz
1989, Journal of Hydrology (106) 131-145
The predominant regional effect of recharge on municipal groundwater quality in Kansas is the dilution of mineralized water in aquifers with relatively shallow water tables. The individual dissolved constituents contributing most to the water-quality variations are sulfate and chloride, and the calcium and sodium accompanying them, which are derived from...
Analysis of the shallow groundwater flow system near Connetqout Brook, Long Island, New York
K. R. Prince, T. E. Reilly, O.L. Franke
1989, Journal of Hydrology (107) 223-250
Streamflow on Long Island is derived principally from shallow groundwater that flows above the deeper regional flow system. The movement of shallow groundwater was studied during 1975-1982 at Connetquot Brook - an undisturbed stream in Connetquot River State Park - in south-central Long Island. The investigation encompassed: (1) field studies...
Reconnaissance estimates of natural recharge to desert basins in Nevada, U.S.A., by using chloride-balance calculations
M. D. Dettinger
1989, Journal of Hydrology (106) 55-78
A chloride-balance method for estimating average natural recharge to groundwater basins in the Basin and Range Province of the western United States may be a useful alternative or complement to current techniques. The chloride-balance method, as presented in this paper, equates chloride in recharge water and runoff to chloride deposited...
Diffusion and consumption of methane in an unsaturated zone in north-central Illinois, U.S.A.
Robert G. Striegl, A. L. Ishii
1989, Journal of Hydrology (111) 133-143
The distribution of CH4 in unsaturated glacial and eolian deposits adjacent to buried low-level radioactive waste was measured, and movement of the gas from the waste source was simulated using a two-dimensional finite-difference model for gas diffusion in the unsaturated zone. Mean PCH4 was greatest (1.56 Pa) in a pebbly-sand deposit 11.6 m...
An operational GLS model for hydrologic regression
Gary D. Tasker, J.R. Stedinger
1989, Journal of Hydrology (111) 361-375
Recent Monte Carlo studies have documented the value of generalized least squares (GLS) procedures to estimate empirical relationships between streamflow statistics and physiographic basin characteristics. This paper presents a number of extensions of the GLS method that deal with realities and complexities of regional hydrologic data sets that were not...
Sediment concentration versus water discharge during single hydrologic events in rivers
G. P. Williams
1989, Journal of Hydrology (111) 89-106
Relations between sediment concentration (C) and water discharge (Q) for a hydrologic event, such as a flood, are studied qualitatively by analyzing "smoothed" temporal graphs (discharge and concentration vs. time) in terms of mode, spread, and skewness. Comparing C Q ratios at a given discharge on the rising and falling...
Hydrologic and geochemical monitoring in Long Valley caldera, Mono County, California, 1986
C. D. Farrar, M.L. Sorey, S.A. Rojstaczer, A.C. Steinemann, M. D. Clark
1989, Water-Resources Investigations Report 89-4033
The U.S. Geological Survey continued to monitor hydrologic and geochemical conditions in the Long Valley caldera during 1986. The monitoring is directed toward detecting changes in the hydrologic system caused by tectonic or magmatic processes. Data collected during 1986 include chemical and isotopic composition of water from selected streams sites,...
Hydrology of the Castle Lake blockage, Mount St. Helens, Washington
William Meyer, M. A. Sabol
1989, Water-Resources Investigations Report 87-4272
The debris avalanche that occurred during the May 19, 1980, eruption of Mount St. Helens blocked South Fork Castle Creek and created Castle Lake. Stability of the blockage was of concern, and a digital model that simulates three-dimensional groundwater movement in the blockage was constructed as part of the analysis...
Hydrology of the Mississippi River Valley alluvial aquifer, south- central United States — A preliminary assessment of the regional flow system
D. J. Ackerman
1989, Water-Resources Investigations Report 88-4028
Data describing the aquifer framework and steady-state regional flow were assembled for the Mississippi River Valley alluvial aquifer north of Vicksburg, Mississippi. The aquifer is part of the Mississippi embayment aquifer system. The 60 to 140 ft thick alluvial aquifer grades from gravel at the bottom to fine sand near...