Distribution and mobility of selenium and other trace elements in shallow groundwater of the western San Joaquin Valley, California
S. J. Deverel, S.P. Milliard
1988, Environmental Science & Technology (22) 697-702
Samples of shallow groundwater that underlies much of the irrigated area in the western San Joaquin Valley, CA, were analyzed for various major ions and trace elements, including selenium. Concentrations of the major ions generally were similar for groundwater collected in the two primary geologic zones - the alluvial fan...
Dissolved gases in the DOSECC Cajon Pass well: First year results
William C. Evans, L. D. White, Y.K. Kharaka
1988, Geophysical Research Letters (15) 1041-1044
Fluid sampled from granitic rock near the 2 km depth in the DOSECC Cajon Pass well contained He, H2, CH4, C2H6, and C2H4 in concentrations much greater than in air-saturated water. The dissolved helium, which ranged in concentration from 0.6 to 0.8 µmole/kg-fluid, was almost entirely radiogenic...
The solubility of noble gases in crude oil at 25-100°C
Yousif K. Kharaka, Daniel J. Specht
1988, Applied Geochemistry (3) 137-144
The solubility of the noble gases He, Ne, Ar, Kr and Xe was measured in two typical crude oils at temperatures of 25–100°C. The oil samples were obtained from the Elk Hills oil field located in southern San Joaquin Valley, California. The experimental procedure consisted of placing a known amount...
Assessment of the analytical capabilities of inductively coupled plasma-mass spectrometry
Howard E. Taylor, John R. Garbarino
1988, Journal of Research of the National Bureau of Standards (93) 433-435
A thorough assessment of the analytical capabilities of inductively coupled plasma-mass spectrometry was conducted for selected analytes of importance in water quality applications and hydrologic research. A multielement calibration curve technique was designed to produce accurate and precise results in analysis times of approximately one minute. The suite of elements...
Using exogenous variables in testing for monotonic trends in hydrologic time series
William M. Alley
1988, Water Resources Research (24) 1955-1961
One approach that has been used in performing a nonparametric test for monotonic trend in a hydrologic time series consists of a two-stage analysis. First, a regression equation is estimated for the variable being tested as a function of an exogenous variable. A nonparametric trend test such as...
The hydrothermal system at Newberry Volcano, Oregon
E.A. Sammel, S. E. Ingebritsen, Robert H. Mariner
1988, Journal of Geophysical Research Solid Earth (93) 10149-10162
Results of recent geological and geophysical studies at Newberry Volcano have been incorporated into conceptual and numerical models of a magma-based hydrothermal system. Numerical simulations begin with emplacement of a small magma body, the presumed source of silicic eruptions at Newberry that began about 10,000 B.P., into a thermal regime...
Deuterium in interstitial water from deep-sea cores
I. Friedman, K. Hardcastle
1988, Journal of Geophysical Research Solid Earth (93) 8249-8263
As part of the Joint Oceanographic Institutions Deep Earth Sampling project, the interstitial waters of cores from 69 holes were sampled for deuterium analysis. Sixteen of the cores penetrated sediments as old as Eocene, and several sampled Cretaceous sediments, which allowed us to examine changes in the deuterium content of...
Preliminary observations of streamflow generation during storms in a forested Piedmont watershed using temperature as a tracer
J. B. Shanley, N.E. Peters
1988, Journal of Contaminant Hydrology (3) 349-365
Variations in streamwater temperature at the outlet of a 41-ha forested watershed at Panola Mountain in the Georgia Piedmont indicate that the initial rapid hydrologic response is caused by a combination of groundwater discharge and channel interception of rainwater. A storm in May 1986 caused a rapid increase in discharge...
Radioactive and nonradioactive solutes in drinking water from Rn-charging devices
E. R. Landa, C.L. Miller, R.F. Brich
1988, Health Physics (54) 99-106
[No abstract available]...
Acid neutralizing processes in an alpine watershed front range, Colorado, U.S.A.-1: Buffering capacity of dissolved organic carbon in soil solutions
Litaor M. Iggy, E.M. Thurman
1988, Applied Geochemistry (3) 645-652
Soil interstitial waters in the Green Lakes Valley, Front Range, Colorado were studied to evaluate the capacity of the soil system to buffer acid deposition. In order to determine the contribution of humic substances to the buffering capacity of a given...
Off-platform Silurian sequences in the Ambler River quadrangle: A section in Geologic studies in Alaska by the U.S. Geological Survey during 1987
Julie A. Dumoulin, Anita G. Harris
1988, Circular 1016
Lithofacies changes in coeval upper Paleozoic rocks have been used to unravel the tectonic history of northern Alaska (for example, Mayfield and others, 1983). Conodont biostratigraphy and detailed petrologic studies are now revealing facies differences in lower Paleozoic rocks that can also be used to constrain their tectono-sedimentary framework (Dumoulin...
Neogene stratigraphy, foraminifera, diatoms, and depositional history of Maria Madre Island, Mexico: Evidence of early Neogene marine conditions in the southern Gulf of California
C. McCloy, J.C. Ingle, J.A. Barron
1988, Marine Micropaleontology (13) 193-212
Foraminifera and diatoms have been analyzed from an upper Miocene through Pleistocene(?) sequence of marine sediments exposed on Maria Madre Island, largest of the Trés Marias Islands off the Pacific coast of Mexico. The Neogene stratigraphic sequence exposed on Maria Madre...
Treatment of fish eggs by infection of chemicals into the incubator water supply
P. E. McAllister, G.A. Wilson
1988, Progressive Fish-Culturist (50) 116-117
A system for injecting chemicals into a water supply to treat fish or fish eggs is described. Equations for calculating treatment mixtures and a sample computation are given....
Geohydrology and mathematical simulation of the Pajaro Valley aquifer system, Santa Cruz and Monterey Counties, California
M. J. Johnson, C.J. Londquist, Julie Laudon, H. T. Mitten
1988, Water-Resources Investigations Report 87-4281
Groundwater development has resulted in lowered water levels and seawater intrusion in the Pajaro Valley, California. An investigation was undertaken to describe the geohydrology of the groundwater flow system and to evaluate the response of the system to pumping stresses by using a mathematical model. The aquifer system consists of...
The development of the continental margin of eastern North America-conjugate continental margin to West Africa
William P. Dillon, J. S. Schlee, Kim D. Klitgord
1988, Journal of African Earth Sciences (7) 361-367
The continental margin of eastern North America was initiated when West Africa and North America were rifted apart in Triassic-Early Jurassic time. Cooling of the crust and its thinning by rifting and extension caused subsidence. Variation in amounts of subsidence led to formation of five basins....
Extracting topographic structure from digital elevation data for geographic information-system analysis
Susan K. Jenson, Julia O. Domingue
1988, Photogrammetric Engineering and Remote Sensing (54) 1593-1600
Software tools have been developed at the U.S. Geological Survey's EROS Data Center to extract topographic structure and to delineate watersheds and overland flow paths from digital elevation models. The tools are specialpurpose FORTRAN programs interfaced with general-purpose raster and vector spatial analysis and relational data base management packages. The first...
Hydraulic conductivity of a sandy soil at low water content after compaction by various methods
John R. Nimmo, Katherine C. Akstin
1988, Soil Science Society of America Journal (52) 303-310
To investigate the degree to which compaction of a sandy soil influences its unsaturated hydraulic conductivity K, samples of Oakley sand (now in the Delhi series; mixed, thermic, Typic Xeropsamments) were packed to various densities and K was measured by the steady-state centrifuge method. The air-dry, machine packing was followed...
Temporal and spatial variation in fruit production by chaparral shrubs,
Jon E. Keeley, S.C. Keeley
F. di Castri, Ch. Floret, S. Rambal, J. Roy, editor(s)
1988, Book chapter, Time-Scales and Water Stress
No abstract available at this time...
Some considerations in modeling the mallard life cycle
Douglas H. Johnson, J.D. Nichols, M.J. Conroy, L.M. Cowardin
M.W. Weller, editor(s)
1988, Book chapter, Waterfowl in winter
We outline a population model proposed to accommodate the full life cycle of the mallard (Anas platyrhynchos). Events during the breeding season are better understood than events at other times of the year, but recent findings suggest the importance of phenomena away from the breeding grounds. Several processes are discussed...
Chemical characteristics of prairie lakes in south-central North Dakota--their potential for influencing use by fish and wildlife
G.A. Swanson, T. C. Winter, V. A. Adomaitis, James W. LaBaugh
1988, Technical Report 18
No abstract available....
Molecular conductivity indices for modelling toxicities of Great Lakes contaminants to Daphnia pulex
James P. Hickey, Dora R. M. Passino, Anthony M. Frank
1988, Conference Paper, Preprints of papers presented at the 3rd Chemical Congress of North America and 195th ACS National Meeting
Hazard assessment of hundreds of observed and potential contaminants in fish, sediment, and water of the Great Lakes is necessary to determine impact on fishery sources and other aquatic biota. The hundreds of new compunds introduced each year have few measured properties. Mathematical models based on quantitative structure-activity relationships (QSARs)...
Distribution of dissolved-solids concentrations and temperature in ground water of the Gulf Coast aquifer systems, south-central United States
Robert A. Pettijohn, Jonathan S. Weiss, Alex K. Williamson
1988, Water-Resources Investigations Report 88-4082
The distribution of dissolved-solids concentrations and temperature in waters of 10 of the aquifers comprising the gulf coast aquifer systems of the Gulf Mexico Coastal Plain are mapped at a scale of 1:3,500,000. Dissolved solids concentration in the aquifers of the Tertiary System ranges from less than 500 mg/L at...
Areal variation in recharge to and discharge from the Floridan aquifer system in Florida
Walter R. Aucott
1988, Water-Resources Investigations Report 88-4057
This report is a revision and update of existing recharge maps of the Floridan aquifer system to include quantitative information derived from Regional Aquifer Systems Analysis models as well as other recent information and also includes information on discharge from the system. The report represents predevelopment conditions with inset map...
Climatic control of vegetation distribution: the role of the water balance with examples from North America and Sequoia National Park, California
N.L. Stephenson
1988, Thesis
No abstract available at this time...
Records of wells, drillers' logs, water-level measurements, and chemical analyses of ground water in Harris and Galveston counties, Texas, 1980-84
J. F. Williams III, L.S. Coplin, C.E. Ranzau Jr., W.B. Lind, C.W. Bonnet, G.L. Locke
1988, Texas Water Development Board Report 310
No abstract available....
