T. R. Alpha, A. K. Cooper
1998, Open-File Report 98-353-B
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Publication Extents
Not all publications have extents, not all extents are completely accurateG.Z. Hornberger, Leonard F. Konikow
1998, Open-File Report 98-188
No abstract available....
Tracy Nishikawa
1998, Water-Resources Investigations Report 97-4246
In times of drought, the local water supplies of the city of Santa Barbara, California, are insufficient to satisfy water demand. In response, the city has built a seawater desalination plant and gained access to imported water in 1997. Of primary concern to the city is delivering water from the...
K. J. Halford
1998, Water-Resources Investigations Report 97-4262
Ground-water flow through the surficial aquifer system at Naval Station Mayport near Jacksonville, Florida, was simulated with a two-layer finite-difference model as part of an investigation conducted by the U.S. Geological Survey. The model was calibrated to 229 water-level measurements from 181 wells during three synoptic surveys (July 17, 1995;...
Katherine S. Paybins, Tracy Nishikawa, John A. Izbicki, Eric G. Reichard
1998, Water-Resources Investigations Report 97-4275
To better understand flow processes, solute-transport processes, and ground-water/surface-water interactions on the Santa Clara River in Ventura County, California, a 24-hour fluorescent-dye tracer study was performed under steady-state flow conditions on a 28-mile reach of the river. The study reach includes perennial (uppermost and lowermost) subreaches and ephemeral subreaches of the...
S.A. Rounds, T. M. Wood, D. D. Lynch
1998, Open-File Report 98-186
Charles M. Francis, John R. Sauer, Jerome R. Serie
1998, Journal of Wildlife Management (62) 1544-1557
Population management of waterfowl requires an understanding of the effects of changes in hunting regulations on harvest and survival rates. Mean survival and recovery rates of American black ducks (Anas rubripes) were estimated during 3 periods of increasingly restrictive harvest regulations: 1950-66, 1967-82, and 1983-93. From the first to the...
Donald P. McGowan Jr., David L. Otis
1998, Journal of Wildlife Management (62) 1443-1451
The mourning dove (Zenaida macroura) call-count index had a significant (P < 0.01) negative trend in South Carolina and the Eastern Management Unit (EMU) during 1988-97. We initiated a banding study in 2 areas in the Coastal Plain of South Carolina to estimate population demographic parameters of doves to generate...
S. J. A. Brown, C. J. N. Wilson, J. W. Cole, J. Wooden
1998, Journal of Volcanology and Geothermal Research (84) 1-37
The Whakamaru group ignimbrites are widespread voluminous welded ignimbrites which crop out along the eastern and western margins of the Taupo Volcanic Zone (TVZ), New Zealand. The ignimbrites have a combined volume exceeding 1000 km3, and were erupted from a large caldera in the central TVZ around 340 ka, following...
Erk Reimnitz, Michael McCormick, J. Bischof, D. A. Darby
1998, Journal of Sedimentary Research (68) 777-787
Modern dispersal of sea-ice-rafted debris (IRD) is important for the Arctic Ocean sediment budget from sources to sinks. Sediment entrainment occurs mainly through the action of small ice crystals (frazil) attaching to sedimentary particles in shallow water, a mechanism that could be selective. The principal source for entrainment of IRD...
E. E. Grossman, C. H. Fletcher, B. M. Richmond
1998, Coral Reefs (17) 309-327
A review of the literature provides 92 estimates of the middle to late Holocene sea-level highstand on Pacific Islands. These data generally support geophysical model calculations that predict a +1 to 3 m relative sea-level highstand on oceanic islands due to the Earth’s rheological response to the melting of the last...
Warren C. Day, Robert P. Dickerson, Christopher J. Potter, Donald S. Sweetkind, Carma A. San Juan, Ronald M. Drake II, Christopher J. Fridrich
1998, IMAP 2627
Yucca Mountain, Nye County, Nevada, has been identified as a potential site for underground storage of high-level radioactive nuclear waste. Detailed bedrock geologic maps form an integral part of the site characterization program by providing the fundamental framework for research into the geologic hazards and hydrologic behavior of the mountain....
T. R. Alpha, J. P. Galloway, S. W. Starratt
1998, Open-File Report 98-131-B
B. G. Katz, H.D. Hornsby
1998, Open-File Report 98-69
A cooperative study between the Suwannee River Water Management District (SRWMD) and the U.S. Geological Survey (USGS) is evaluating sources of nitrate in water from selected springs and zones in the Upper Floridan aquifer in the Suwannee River Basin. A multi-tracer approach, which consists of the analysis of water samples...
J.R. Evans
1998, Open-File Report 98-109
The severity of earthquake ground shaking varies tremendously over very short distances (Figures 1a-c). Within a distance of as little as 1 km from the nearest station, one knows little more than what can be obtained from an attenuation relation, given only distance from the fault rupture and the geology...
Jill Baron, M.D. Hartman, Timothy G.F. Kittel, L.E. Band, D. S. Ojima, R.B. Lammers
1998, Ecological Applications (8) 1037-1051
Over one-third of the land area in the South Platte Basin of Colorado, Nebraska, and Wyoming, has been converted to croplands. Irrigated cropland now comprises 8% of the basin, while dry croplands make up 31%. We used the RHESSys model to compare the changes in plant productivity and vegetation-related hydrological...
Andrew M. O’Reilly
1998, Water-Resources Investigations Report 97-4199
Wastewater reclamation and reuse has become increasingly popular as water agencies search for alternative water-supply and wastewater-disposal options. Several governmental agencies in central Florida currently use the land-based application of reclaimed water (wastewater that has been treated beyond secondary treatment) as a management alternative to surface-water disposal of wastewater. Water...
L.D. Putnam
1998, Water-Resources Investigations Report 97-4102
Jon J. Major
1998, Sedimentary Geology (117) 151-164
Replicable, pronounced orientation of discoid pebbles (≥8 mm) embedded on surfaces of large (∼10 m3) experimental debris-flow deposits reveals that strongly aligned, imbricate fabric can develop rapidly over short distances in mass flows. Pebble long axes aligned subparallel to deposit margins as well as subparallel to margins of surge waves...
Nancy E. King, Wayne R. Thatcher
1998, Journal of Geophysical Research: Solid Earth (103) 18069-18086
Geodetic arrays observed by the U.S. Coast and Geodetic Survey span the Imperial fault in southern California. For the 1940 M 7.1 Imperial Valley earthquake, a 1934–1941 triangulation network has sufficient resolution to allow inversion for the coseismic slip distribution on fault segments 5 to 25 km long extending from the surface...
Jon E. Keeley
1998, Oecologia (116) 85-97
Cladistic analysis supports the conclusion that the Orcuttieae tribe of C4 grasses reflect evolution from a terrestrial ancestry into seasonal pools. All nine species in the tribe exhibit adaptations to the aquatic environment, evident in the structural characteristics of the juvenile foliage, which persist submerged for 1–3 months prior to metamorphosis...
Richard M. Iverson, Steven P. Schilling
1998, GSA Bulletin (110) 972-984
A new method of delineating lahar hazard zones in valleys that head on volcano flanks provides a rapid, objective, reproducible alternative to traditional methods. The rationale for the method derives from scaling analyses of generic lahar paths and statistical analyses of 27 lahar paths documented at nine volcanoes. Together these...
Thomas C. Pierson
1998, Bulletin of Volcanology (60) 98-109
Travel times for wet volcanic mass flows (debris avalanches and lahars) can be forecast as a function of distance from source when the approximate flow rate (peak discharge near the source) can be estimated beforehand. The near-source flow rate is primarily a function of initial flow volume, which should be...
James G. Brown, R. L. Bassett, Pierre D. Glynn
1998, Journal of Hydrology (209) 225-250
Large-scale mining activities have generated a plume of acidic ground water more than 15 km long in the regional aquifer of the Pinal Creek Basin. A one-dimensional reactive-transport model was developed using PHREEQC to aid in the analysis of transport and chemical processes in the plume and to determine the uses...
M. Gabirela Mangano, Luis A. Buatois, R.R. West, Christopher G. Maples
1998, Palaios (13) 335-351
Upper Carboniferous tidal-flat deposits near Waverly, eastern Kansas (Stull Shale Member, Kanwaka Shale Formation), host abundant and very well-preserved trace fossils attributed to the activity of burrowing bivalves. Thin shell lenses with an abundant bivalve fauna area associated with the ichnofossil-bearing beds and afford an unusual opportunity to relate trace...