Riverine based eco-tourism: Trinity River non-market benefits estimates
A. J. Douglas, J. G. Taylor
1998, International Journal of Sustainable Development and World Ecology (5) 136-148
California's Central Valley Project (CVP) was approved by voters in a statewide referendum in 1933. CVP referendum approval initiated funding for construction of important water development projects that had far reaching effects on regional water supplies. The construction of Trinity Dam in 1963 and the subsequent transbasin diversion of Trinity...
Tritium-helium 3 dating under complex conditions in hydraulically stressed areas of a buried-valley aquifer
Stephanie Dunkle Shapiro, Gary L. Rowe, Peter Schlosser, Andrea Ludin, Martin Stute
1998, Water Resources Research (34) 1165-1180
The 3H-3He dating method is applied in a buried-valley aquifer near Dayton, Ohio. The study area is large, not all sampling locations lie along well-defined flow paths, and existing wells with variable screen lengths and diameters are used. Reliable use of the method at this site requires addressing several complications: (1)...
Bluebell field, Uinta basin: Reservoir characterization for improved well completion and oil recovery
Scott L. Montgomery, C. D. Morgan
1998, American Association of Petroleum Geologists Bulletin (82) 1113-1132
Bluebell field is the largest oil-producing area in the Uinta basin of northern Utah. The field includes over 300 wells and has produced 137 MMbbl oil and 177 bcf gas from fractured Paleocene-Eocene lacustrine and fluvial deposits of the Green River and Wasatch (Colton) formations. Oil and gas are produced...
Riparian control of stream-water chemistry: Implications for hydrochemical basin models
R. P. Hooper, Brent T. Aulenbach, Douglas A. Burns, J. McDonnell, J. Freer, C. Kendall, K. Beven
1998, IAHS-AISH Publication (248) 451-458
End-member mixing analysis has been used to determine the hydrological structure for basin hydrochemical models at several catchments. Implicit in this use is the assumption that controlling end members have been identified, and that these end members represent distinct landscape locations. At the Panola Mountain Research Watershed, the choice of...
Impact of zebra and quagga mussels (Dreissena spp.) on freshwater unionids (Bivalvia: Unionidae) in the Detroit River of the Great Lakes
D. W. Schloesser, W. P. Kovalak, G. D. Longton, K. L. Ohnesorg, R. D. Smithee
1998, American Midland Naturalist (140) 299-313
To assess the impact of zebra and quagga mussel (Dreissena spp.) infestation on unionids, unionids (Bivalvia: Unionidae) were sampled in the Detroit River in 1982–1983, before mussels invaded the river, and in 1992 and 1994, after mussels invaded the river. Live unionids at four stations along the southeastern shore accounted for...
Birds of the Indigirka River Delta, Russia: Historical and biogeographic comparisons
John M. Pearce, Daniel Esler, Andrei G. Degtyarev
1998, Arctic (51) 361-370
We documented the breeding status and relative abundance of all avian species on the coastal portion of the Indigirka River Delta during spring and summer 1993-95. Data on avifaunal composition were then compared to data from adjacent areas from Eastern Siberia to the Chukotka Peninsula to evaluate how species composition...
Numerical modelling of vertically extensive groundwater bodies in Maui, Hawaii: An alternative to perched aquifers
S. B. Gingerich
1998, IAHS-AISH Publication 167-174
Groundwater in East Maui, Hawaii is traditionally described as a series of discrete aquifers perched on low-permeability units underlain by a basal lens with heads of about 2-3 m. An alternative concept, a fully saturated aquifer to as much as 1400 m elevation, was investigated using a numerical model with...
Fluid-rock reactions in an evaporitic melange, Permian Haselgebirge, Austrian Alps
C. Spotl, F.J. Longstaffe, K. Ramseyer, Michael J. Kunk, R. Wiesheu
1998, Sedimentology (45) 1019-1044
Tectonically isolated blocks of carbonate rocks present within the anhydritic Haselgebirge melange of the Northern Calcareous Alps record a complex history of deformation and associated deep-burial diagenetic to very low-grade metamorphic reactions. Fluids were hot (up to ~ 250 ??C) and reducing brines charged with carbon dioxide. Individual carbonate outcrops...
Pedogenic influences on magnetic susceptibility patterns in loess-paleosol sequences of southwestern Illinois
D.A. Grimley
1998, Quaternary International (51-52) 51
[No abstract available]...
Impact cratering through geologic time
E.M. Shoemaker, C.S. Shoemaker
1998, Journal of the Royal Astronomical Society of Canada (92) 297-309
New data on lunar craters and recent discoveries about craters on Earth permit a reassessment of the bombardment history of Earth over the last 3.2 billion years. The combined lunar and terrestrial crater records suggest that the long-term average rate of production of craters larger than 20 km in diameter...
A new view into the Cascadia subduction zone and volcanic arc: Implications for earthquake hazards along the Washington margin
T. Parsons, A.M. Trehu, J.H. Luetgert, K. Miller, F. Kilbride, R.E. Wells, M. A. Fisher, E. Flueh, Uri S. ten Brink, N.I. Christensen
1998, Geology (26) 199-202
In light of suggestions that the Cascadia subduction margin may pose a significant seismic hazard for the highly populated Pacific Northwest region of the United States, the U.S. Geological Survey (USGS), the Research Center for Marine Geosciences (GEOMAR), and university collaborators collected and interpreted a 530-km-long wide-angle onshore-offshore seismic transect...
Consideration of measurement error when using commercial indoor radon determinations for selecting radon action levels
G.M. Reimer, S.L. Szarzi, Michael P. Dolan
1998, Conference Paper, Journal of Radioanalytical and Nuclear Chemistry
An examination of year-long, in-home radon measurement in Colorado from commercial companies applying typical methods indicates that considerable variation in precision exists. This variation can have a substantial impact on any mitigation decisions, either voluntary or mandated by law, especially regarding property sale or exchange. Both long-term exposure (nuclear track...
Quantitative measure of the variation in fault rheology due to fluid-rock interactions
M.L. Blanpied, C.J. Marone, D.A. Lockner, J.D. Byerlee, D.P. King
1998, Journal of Geophysical Research B: Solid Earth (103) 9691-9712
We analyze friction data from two published suites of laboratory tests on granite in order to explore and quantify the effects of temperature (T) and pore water pressure (Pp) on the sliding behavior of faults. Rate-stepping sliding tests were performed on laboratory faults in granite containing “gouge” (granite powder), both...
Flow of river water into a Karstic limestone aquifer. 1. Tracing the young fraction in groundwater mixtures in the Upper Floridan Aquifer near Valdosta, Georgia
Niel Plummer, E. Busenberg, J. B. McConnell, S. Drenkard, P. Schlosser, R. L. Michel
1998, Applied Geochemistry (13) 995-1015
The quality of water in the Upper Floridan aquifer near Valdosta, Georgia is affected locally by discharge of Withlacoochee River water through sinkholes in the river bed. Data on transient tracers and other dissolved substances, including Cl−, 3H, tritiogenic helium-3 (3He), chlorofluorocarbons (CFC-11, CFC-12,...
Vulnerability of desert biological soil crusts to wind erosion: The influences of crust development, soil texture, and disturbance
Jayne Belnap, Dale A. Gillette
1998, Journal of Arid Environments (39) 133-142
Biological soil crusts, consisting of cyanobacteria, green algae, lichens, and mosses, are important in stabilizing soils in semi-arid and arid lands. Integrity of these crusts is compromised by compressional disturbances such as foot, vehicle, or livestock traffic. Using a portable wind tunnel, we found threshold friction velocities (TFVs) of undisturbed...
Needle twins and right-angled twins in minerals: comparison between experiment and theory
E.K.H. Salje, A. Buckley, G. Van Tendeloo, Y. Ishibashi, Gordon L. Nord Jr.
1998, American Mineralogist (83) 811-822
Transformation twinning in minerals forms isolated twin walls, intesecting walls with corner junctions, and wedge-shaped twins as elements of hierarchical patterns. When cut perpendicular to the twin walls, the twins have characteristic shapes, right-angled and needle-shaped wall traces, which can be observed by transmission electron microscopy or by optical microscopy....
Communicating with congress: Part II. Contacting the beast
J.A. Briskey
1998, Geotimes (43) 21-24
[No abstract available]...
Tropical storm flooding of a coastal plain landscape: Extensive floodplains ameliorated potential adverse effects on water quality, fishes, and molluskan communities
W.K. Michener, E.R. Blood, J.B. Box, C. A. Couch, S.W. Golladay, D. J. Hippe, R.J. Mitchell, B.J. Palik
1998, BioScience (48) 696-705
No abstract available....
A geologic history of the north-central Appalachians, part 3. The Alleghany orogeny
R. T. Faill
1998, American Journal of Science (298) 131-179
The north-central Appalachians occupy a critical position within the 3000+ km-long Appalachian orogen, lying southwest of the boundary between the central and northern Appalachians (CNAB). The one-billion-year-long history of tectonic activity in eastern Laurentia includes the creation and evolution of the Appalachian orogen during the Paleozoic and the Mesozoic transformation...
Earthquake triggering by transient and static deformations
J. Gomberg, N.M. Beeler, M.L. Blanpied, P. Bodin
1998, Journal of Geophysical Research B: Solid Earth (103) 24411-24426
Observational evidence for both static and transient near-field and far-field triggered seismicity are explained in terms of a frictional instability model, based on a single degree of freedom spring-slider system and rate- and state-dependent frictional constitutive equations. In this study a triggered earthquake is one whose failure time has been...
In situ determination of particle friction angles of fluvial gravels
Christopher E. Johnston, E.D. Andrews, John Pitlick
1998, Water Resources Research (34) 2017-2030
Particle friction angles Φ represent the physical resistance to initial movement of a sediment particle and are therefore useful for relating initiation of motion to particular flows. We determined over 8000 friction angle values at five natural rivers by applying a new method that uses a digital load cell to...
Factors controlling As and U in shallow ground water, southern Carson Desert, Nevada
A. H. Welch, M.S. Lico
1998, Applied Geochemistry (13) 521-539
Unusually high As and U concentrations (> 100 ??g/L) are widespread in shallow ground water beneath the southern Carson Desert. The high concentrations, which locally exceed 1000 ??g/L, are of concern from a human health standpoint because the shallow ground water is used for domestic supply. Possible affects on wildlife...
Studies on the bacterial flora of native freshwater bivalves from the Ohio River
C. E. Starliper, R. Villella, P. Morrison, J. Mathias
1998, Biomedical Letters (58) 85-95
No abstract available. ...
Radio-tracking manatees from land and space: tag design, implementation, and lessons learned from long-term study
C. J. Deutsch, R. K. Bonde, J.P. Reid
1998, Marine Technology Society Journal (32) 18-29
West Indian manatees (Trichechus manatus) were tracked along the Atlantic coast of Florida and Georgia (N = 83 manatees, n = 439 tag deployments, 1986-1996) and in eastern Puerto Rico (N = 8, n = 43, 1992-1996) using conventional and satellite-based radio-telemetry systems. A floating radio-tag, attached by a flexible...
Regional land cover characterization using Landsat thematic mapper data and ancillary data sources
James E. Vogelmann, Terry L. Sohl, P.V. Campbell, D.M. Shaw
Veith G., editor(s)
1998, Environmental Monitoring and Assessment (51) 415-428
As part of the activities of the Multi-Resolution Land Characteristics (MRLC) Interagency Consortium, an intermediate-scale land cover data set is being generated for the conterminous United States. This effort is being conducted on a region-by-region basis using U.S. Standard Federal Regions. To date, land cover data sets have been...
