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Hydrogeology and flow of water in a sand and gravel aquifer contaminated by wood-preserving compounds, Pensacola, Florida
B.J. Franks
1988, Water-Resources Investigations Report 87-4260
The sand and gravel aquifer in southern Escambia County, Florida , is a typical surficial aquifer composed of quartz sands and gravels interbedded locally with silts and clays. Problems of groundwater contamination from leaking surface impoundments are common in surficial aquifers and are a subject of increasing concern and attention....
A modular three-dimensional finite-difference ground-water flow model
Michael G. McDonald, Arlen W. Harbaugh
1988, Techniques of Water-Resources Investigations 06-A1
This report presents a finite-difference model and its associated modular computer program. The model simulates flow in three dimensions. The report includes detailed explanations of physical and mathematical concepts on which the model is based and an explanation of how those concepts are incorporated in the modular structure of the...
Review of the general geology and solid-phase geochemical studies in the vicinity of the Central Oklahoma aquifer
Elwin L. Mosier, John H. Bullock
1988, Circular 1019
The Central Oklahoma aquifer is the principal source of ground water for municipal, industrial, and rural use in central Oklahoma. Ground water in the aquifer is contained in consolidated sedimentary rocks consisting of the Admire, Council Grove, and Chase Groups, Wellington Formation, and Garber Sandstone and in the unconsolidated Quaternary...
Discharge ratings for control structures at McHenry Dam on the Fox River, Illinois
G. G. Fisk
1988, Water-Resources Investigations Report 87-4226
Twenty-three measurement of discharge were used to determine discharge ratings for the five adjustable sluice gates, spillway and fish ladder at McHenry Dam on the Fox River in Illinois. Discharge ratings were determined for free weir, free orifice, and submerged orifice flow regimes. Hydraulic conditions that identify flow regimes at...
Effects of fluctuating river-pool stages on ground-water levels in the adjacent alluvial aquifer in the lower Arkansas River, Arkansas
D.A. Freiwald, G.D. Grosz
1988, Water-Resources Investigations Report 87-4279
The U.S. Geological Survey conducted a study in cooperation with the U.S. Army Corps of Engineers to determine the effect of fluctuating the lower Arkansas River. A network of 41 wells was used to delineate 4 cross sections adjacent to river pools 2 and 5 of the McClellan-Kerr Arkansas River...
Selected water-quality data for the Fort Hall Indian Reservation, southeastern Idaho
D. J. Parliman, H.W. Young
1988, Open-File Report 88-496
This report presents July 1988 water quality data, principally dissolved nitrite plus nitrate (as nitrogen), and depth-to-water measurements for 60 wells in the Fort Hall Indian Reservation north of Pocatello, southeastern Idaho. Nitrogen concentrations ranged from 0.7 to 24 mg/L; the median concentration was 3.1 mg/L. Nitrogen concentrations in 11...
Hydrogeology and preliminary assessment of regional flow in the upper Cretaceous and adjacent aquifers in the northern Mississippi embayment
J. V. Brahana, T. O. Mesko
1988, Water-Resources Investigations Report 87-4000
On a regional scale, the groundwater system of the northern Mississippi embayment is composed of a series of nonindurated clastic sediments that overlie a thick sequence of Paleozoic carbonate, sandstones, and shales. The units that comprise the geohydrologic framework of this study are the alluvium-lower Wilcox Aquifer the Midway confining...
Cumulative potential hydrologic impacts of surface coal mining in the eastern Powder River structural basin, northeastern Wyoming
L.J. Martin, D. L. Naftz, H. W. Lowham, J.G. Rankl
1988, Water-Resources Investigations Report 88-4046
There are 16 existing and six proposed surface coal mines in the eastern Powder River structural basin of northeastern Wyoming. Coal mining companies predict water level declines of 5 ft or more in the Wasatch aquifer to extend form about 1,000 to about 2,000 ft beyond the mine pits. The...
Eustrongylides sp. epizootic in young common egrets (Casmerodius albus)
Thomas J. Roffe
1988, Avian Diseases (32) 143-147
In May 1985, epizootic mortality was reported in common egrets (Casmerodius albus) on Avery Island, Louisiana. Subsequent investigation revealed that more than 400 birds died. Severe peritoneal nematodiasis (Eustrongylides sp.) was found on postmortem examination. A nearby breeding rookery on the same island was apparently unaffected. Reasons for this selective...
Selenium accumulation in benthic bivalves and fine sediments of San Francisco Bay, the Sacramento-San Joaquin Delta, and selected tributaries
Carolyn Johns, Samuel N. Luoma, Virginia Elrod
1988, Estuarine, Coastal and Shelf Science (27) 381-396
Spatial distributions of selenium were determined in fine-grained, oxidized, surface sediments and in two benthic bivalves (Corbicula sp., a suspension-feeding freshwater clam, and Macoma balthica, a deposit-feeding brackish-water clam) within San Francisco Bay, the San Joaquin River and three river systems unlikely to be subject to selenium inputs. Biologically available selenium enters...
Phytoplankton growth rates in a light-limited environment, San Francisco Bay
Andrea E. Alpine, James E. Cloern
1988, Marine Ecology Progress Series (44) 167-173
Phytoplankton cells reside in a turbulent medium partitioned into an upper photic zone that sustains photosynthesis, and a lower aphotic zone that does not. In estuaries, vertical mixing rates between these 2 zones can be rapid (< 1 generation time) because of tidal stirring and because the mixing depth is...
Nutritional values of waterfowl foods
Leigh H. Fredickson, Fredric A. Reid
1988, Fish and Wildlife Leaflet 13.1.1
wetland habitats throughout their annual cycles. Survival, reproduction, and growth are dependent on the availability of foods that meet nutritional requirements for recurring biological events. These requirements occur among a wide variety of environmental conditions that also influence nutritional demands. Recent work on nesting waterfowl has identified the female’s...
Remote sensing to petroleum exploration in the Qaidam Basin, China
Wang Wenyan, Song Jianguo, Zhang Jiong, Wang Tianxi, Fan Congwu, G. B. Bailey, John L. Dwyer
Holly C. Wagner, Leslie C. Wagner, Frank F. H. Wang, Florence L. Wong, editor(s)
1988, Conference Paper, Petroleum resources of China and related subjects
No abstract available....
Relationships between silicic plutonism and volcanism: Geochemical evidence
R. Macdonald, R.L. Smith
1988, Transactions of the Royal Society of Edinburgh, Earth Sciences (79 ) 257-263
Field associations (voluminous ash flow deposits, rhyolitic stocks and dykes, ring complexes), evidence of repeated influxes of mafic magma, and thermal constraints indicate that many high-level silicic plutons (magma chambers) acted as open systems for considerable parts of their history. The long thermal lifetime, as well as other evidence from...