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Page 3768, results 94176 - 94200

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Not all publications have extents, not all extents are completely accurate
Ground-water flow and simulated effects of development in Paradise Valley, a basin tributary to the Humboldt River in Humboldt County, Nevada
David E. Prudic, M.E. Herman
1996, Professional Paper 1409-F
A computer model was used to characterize ground-water flow in Paradise Valley, Nevada, and to evaluate probable long-term effects of five hypothetical development scenarios. One finding of the study is that concentrating pumping at the south end of Paradise Valley may increase underflow from the adjacent Humboldt River valley, and...
Spawning of the shortnose sturgeon the Merrimack River, Massachusetts
M.C. Kieffer, B. Kynard
1996, Transactions of the American Fisheries Society (125) 179-186
We tracked 10 ultrasonically tagged shortnose sturgeons Acipenser brevirostrurn during spring in the Merrimack River to investigate spawning. Seven fish in 1989 and six fish in 1990 were tracked intensively to identify the timing and location of spawning and to characterize spawning habitat. In mid‐April 1989 and 1990, fish moved upstream to...
Modeling of fluidized ejecta emplacement over digital topography on Venus
Jeffrey R. Johnson, Lisa R. Gaddis
1996, Journal of Geophysical Research E: Planets (101)
The FLOW computer model of McEwen and Malin (1989) modified for application to the study of Venus fluidized ejecta blankets (FEBs) demonstrates that relatively low viscosities, yield strengths, and initial velocities are required to duplicate the observed flow paths of the outflow materials. The model calculates the velocities and simulated...
Scaling population density and spatial pattern for terrestrial, mammalian carnivores
K. Shawn Smallwood, C. Schonewald
1996, Oecologia (105) 329-335
A large part of ecological theory has been developed with the assumption that intra- and inter-specific patterns of density and spatial distribution can be consistently and reliably compared, and that these patterns have represented populations across nonstudied landscapes. These assumptions are erroneous. We found that log10 population density estimates consistently decreased...
Simulation of ground-water flow of the coastal plain aquifers in parts of Maryland, Delaware, and the District of Columbia
W.B. Fleck, D.A. Vroblesky
1996, Professional Paper 1404-J
Geomorphic processes and the aquatic habitat of the Redwood Creek basin were studied extensively between 1973 and 1983. This volume contains 22 separate articles by 32 investigators who studied geology, major storms, timber harvesting and its role on accelerating erosion, mass movement, fluvial erosion, sediment transport and storage, stream channel...
Organochlorine accumulation by sentinel mallards at the Winston-Thomas sewage treatment plant, Bloomington, Indiana
T. W. Custer, D. W. Sparks, S. A. Sobiech, R. K. Hines, M. J. Melancon
1996, Archives of Environmental Contamination and Toxicology (30) 163-169
Farm-raised 12-month-old female mallards (Anas platyrhynchos) were released at the Winston-Thomas sewage treatment plant, Bloomington, Indiana. Five mallards were sacrificed at the start of the study and at approximately 10-day intervals through day 100. Concentrations of polychlorinated biphenyls (PCBs) in carcasses increased linearly with time of exposure and exceeded 16...
Vegetation, substrate and hydrology in floating marshes in the Mississippi River Delta Plain wetlands, USA
C.E. Sasser, J. G. Gosselink, E.M. Swenson, C.M. Swarzenski, N.C. Leibowitz
1996, Vegetatio (122) 129-142
In the 1940s extensive floating marshes (locally called ‘flotant’) were reported and mapped in coastal wetlands of the Mississippi River Delta Plain. These floating marshes included large areas of Panicum hemitomon-dominated freshwater marshes, and Spartina patens/Scirpus olneyi brackish marshes. Today these marshes appear to be quite different in extent and...
Ground-water conditions in Las Vegas Valley, Clark County, Nevada: Part 2, hydrogeology and simulation of ground-water flow
David S. Morgan, Michael D. Dettinger
1996, Water Supply Paper 2320-B
In sedimentary deposits beneath arid Las Vegas Valley, ground-water levels have declined as much as 280 feet since 1912 in deeper aquifers due to pumping associated with urban development. Accompanying land subsidence has been as great as 5 feet. Predictive simulations show that by maintaining pumpage and recharge at 1980...
Paleomagnetic study of the northern Ford Ranges, western Marie Byrd Land, West Antarctica: Motion between West and East Antarctica
B. Luyendyk, S. Cisowski, C. Smith, S. Richard, D. Kimbrough
1996, Tectonics (15) 122-141
A paleomagnetic study of Paleozoic and Mesozoic crystalline rocks in the northern Ford Ranges of Marie Byrd Land, West Antarctica, has determined a middle Cretaceous (circa 100 Ma) paleomagnetic pole and provided constraints on possible clockwise rotation of these ranges and on the rifting of east Gondwana. The 40Ar/39Ar thermochronology data...
Performance of antimycin in high-gradient streams
K.F. Tiffan, Eric P. Bergersen
1996, North American Journal of Fisheries Management (16) 465-468
A variety of low- to high-gradient streams in Colorado and Montana were treated with the fish toxicant antimycin (Fintrol) to evaluate its efficacy in relation to stream gradient. In general, a dose of 8 μg/L delivered for 8 h effectively killed brook trout Salvelinus fontinalisand rainbow trout Oncorhynchus mykiss over...
Fractal structure of sequential behaviour patterns: an indicator of stress
C.L. Alados, J.M Escos, J.M. Emlen
1996, Animal Behaviour (51) 437-443
The detection of stress arising from parasitic infection bySarcoptes scabieisand from pregnancy is explored, using a fractal analysis of head lifting behaviour and feeding–non-feeding activity sequences in female Spanish ibex,Capra pyrenaica, under natural conditions. Because organisms under stress increase their metabolic rate and, in consequence, energy consumption, it follows that...
Large-scale right-slip displacement on the East San Francisco Bay region fault system, California: Implications for location of late Miocene to Pliocene Pacific plate boundary
R. J. McLaughlin, W.V. Sliter, D. H. Sorg, P.C. Russell, A.M. Sarna-Wojcicki
1996, Tectonics (15) 1-18
A belt of northwardly younging Neogene and Quaternary volcanic rocks and hydrothermal vein systems, together with a distinctive Cretaceous terrane of the Franciscan Complex (the Permanente terrane), exhibits about 160 to 170 km of cumulative dextral offset across faults of the East San Francisco Bay Region (ESFBR) fault system. The...
Submarine landslides
M. A. Hampton, H.J. Lee, J. Locat
1996, Reviews of Geophysics (34) 33-59
Landslides are common on inclined areas of the seafloor, particularly in environments where weak geologic materials such as rapidly deposited, finegrained sediment or fractured rock are subjected to strong environmental stresses such as earthquakes, large storm waves, and high internal pore pressures. Submarine landslides can involve huge amounts of material...
Organic geochemistry applied to environmental assessments of Prince William Sound, Alaska, after the Exxon Valdez oil spill—a review
A.E. Bence, Keith A. Kvenvolden, M.C. Kennicutt II
1996, Organic Geochemistry (24) 7-42
Organic geochemistry played a major role in the environmental assessments conducted following the Exxon Valdez oil spill, which occurred on March 24, 1989, and released about 258,000 bbls (41 million liters) of Alaska North Slope crude oil into Prince William Sound. Geochemical analyses of more than 15,000 sediment, tar, and biological samples...
Regional land cover characterization using multiple sources of intermediate-scale data
James Vogelmann, S. M. Howard, Terry L. Sohl
R.E. MacIntosh, S.J. Frasier, C.T. Swift, editor(s)
1996, Conference Paper, IGARSS '96. 1996 International Geoscience and Remote Sensing Symposium
Many United States federal agencies need accurate, intermediate scaled, land cover information. While many techniques and approaches have been successfully used to classify land cover in relatively small regions, there are substantial problems in applying these techniques to large multi-scene regions. An evaluation was conducted of the multiple layer land...
Intermediate‐depth intraslab earthquakes and arc volcanism as physical expressions of crustal and uppermost mantle metamorphism in subducting slabs
Stephen H. Kirby, E. Robert Engdahl, Roger P. Denlinger
1996, Book chapter, Subduction: Top to bottom
We elaborate on the well-known spatial association between axc volcanoes and Wadati Benioff zones and explore in detail their genetic relationships as dual physical expressions of slab metamorphism of the oceanic crust and uppermost mantle. At hypocentral depths less than 200 km intra slab Wadati-Benioff earthquakes tend to occur near...