Borehole-wall imaging with acoustic and optical televiewers for fractured-bedrock aquifer investigations
John H. Williams, Carole D. Johnson
2000, Conference Paper, Proceedings of the seventh international symposium on borehole geophysics for minerals, geotechnical, and groundwater applications
Imaging with acoustic and optical televiewers results in continuous and oriented 360 degree views of the borehole wall from which the character and orientation of lithologic and structural features can be defined for fractured-bedrock aquifer investigations. Fractures are more clearly defined under a wider range of conditions on acoustic images...
Natural resource and ecosystem costs of coastal hazards
H. Kunreuther, R. Platt, S. Baruch, R. Bernknopf, M. Buckley, V. Burkett, D. Conrad, T. Davidson, K. Deutsch, D. Geis, M. Jannereth, A. Knap, H. Lane, G. Ljung, M. McCauley, D. Mileti, T. Miller, B. Morrow, J. Meyers, R. A. Pielke, A. Pratt, J. Tripp
2000, Book chapter, The Hidden Costs of Coastal Hazards
Describes the topic of natural resource and ecosystem costs of coastal hazards through the work of the John Heinz III Center for Science, Economics and the Environment....
Airborne geophysical surveys in the Boulder Watershed, Jefferson and Lewis and Clark Counties, Montana
Bruce D. Smith, Victor Franklin Labson, Patricia L. Hill
2000, Open-File Report 2000-240
INTRODUCTIONThree airborne geophysical surveys have been made in the Boulder watershed and adjacent areas (fig. 1). The objectives of the geophysical studies in the watershed is to map subsurface lithologic, structural and hydrologic features important in controlling possible ground water contamination from mining activities and to design remediation efforts. These studies are part of an abandoned...
Measurement of 1999 drought conditions in Mississippi
D. Phil Turnipseed, Loyd G. Long
Jeffery A. Ballweber, editor(s)
2000, Conference Paper, Proceedings of the thirtieth Mississippi Water Resources Conference
Accurate and reliable water-resources data collected during drought conditions are critical to regulatory agencies such as the Mississippi Department of Environmental Quality (MDEQ). Droughts have affected Mississippi during 1940-44, 1951-57, 1962-71, 1980-82 and 1983-88. In late summer and early autumn 1999, many areas of Mississippi experienced near record drought conditions...
Ground-water conditions in Utah, spring of 2000
Carole B. Burden, J.D. Sory, M.R. Danner, K. K. Johnson, T.A. Kenny, S.J. Brockner, Robert J. Eacret, Paul Downhour, B.A. Slaugh, R.L. Swenson, J.H. Howells, H.K. Christiansen, M.J. Fisher
2000, Cooperative Investigations Report 41
This is the thirty-seventh in a series of annual reports that describe ground-water conditions in Utah. Reports in this series, published cooperatively by the U.S. Geological Survey and the Utah Department of Natural Resources, Division of Water Resources and Division of Water Rights, provide data to enable interested parties to...
Trace elements in seep waters along Whitewood Creek, South Dakota, and their toxicity to fathead minnows
S. J. Hamilton, K.J. Buhl
2000, Bulletin of Environmental Contamination and Toxicology (65) 740-747
Whitewood Creek, located in the Black Hills of southwestern South Dakota, has a long history of contamination from mining activity. Gold exploration began in the 1870s, and has continued since that time. Whitewood Creek received direct releases of tailings from 1870 to 1977 from Gold Run Creek in Lead, SD....
Creating a standardized watersheds database for the Lower Rio Grande/Río Bravo, Texas
J.R. Brown, Randy L. Ulery, Jean W. Parcher
2000, Open-File Report 00-065
This report describes the creation of a large-scale watershed database for the lower Rio Grande/Río Bravo Basin in Texas. The watershed database includes watersheds delineated to all 1:24,000-scale mapped stream confluences and other hydrologically significant points, selected watershed characteristics, and hydrologic derivative datasets.<span size="3" data-mce-style="font-size:...
Nutrient pollution of coastal rivers, bays, and seas
Robert W. Howarth, D. B. Anderson, James E. Cloern, Chris Elfring, Charles S. Hopkinson, Brian Lapointe, Tom Malone, Nancy Marcus, Karen McGlathery, Andrew N. Sharpley, Dan Walker
2000, Issues in Ecology 1-16
Over the past 40 years, antipollution laws have greatly reduced discharges of toxic substances into our coastal waters. This effort, however, has focused largely on point-source pollution of industrial and municipal effluent. No comparable effort has been made to restrict the input of nitrogen (N)...
Effects of food limitation and emigration on self-thinning in experimental minnow cohorts
J. B. Dunham, B. R. Dickerson, E. Beever, R. D. Duncan, G.L. Vinyard
2000, Journal of Animal Ecology (69) 927-934
1. The theory of food-regulated self-thinning (FST) for mobile animals predicts population density (N) to be an inverse function of mean body mass (W) scaled to an exponent (b), such that N = k W−b, where k is a constant. FST also predicts energy requirements (or energy flow) to remain constant over time (termed energetic...
Examining ecological consequences of feral horse grazing using exclosures
E.A. Beever, P. F. Brussard
2000, Western North American Naturalist (60) 236-254
Although feral horses have inhabited western North America since the end of the 16th century, relatively little synecological research has been conducted to quantitatively characterize how they interact with ecosystem components. Because feral horses exhibit watering behavior markedly different from that of domestic cattle, it is particularly important to...
Charismatic megafauna or exotic pest? Interactions between popular perceptions of feral horses (Equus caballus) and their management and research
E.A. Beever, P. F. Brussard
2000, Conference Paper
Modeling the hydroclimatology of the San Francisco Bay-Delta estuary and watershed
Noah Knowles
2000, Thesis
No abstract available....
Influence of El Niño on lake and river ice cover in the Northern Hemisphere from 1900 to 1995
Dale M. Robertson, Randolph Wynne, William Y. B. Chang
2000, Verhandlugen Internationale Vereingung fur Limnologie (27) 2784-2788
No abstract available....
Effect of hibernation and reproductive status on body mass and condition of coastal brown bears
Grant V. Hilderbrand, C. C. Schwartz, C.T. Robbins, Thomas A. Hanley
2000, Journal of Wildlife Management (64) 178-183
We investigated the effect of hibernation and reproductive status on changes in body mass and composition of adult female brown bears (Ursus arctos) on the Kenai Peninsula, Alaska. This information is fundamental to understanding nutritional ecology of wild brown bear populations. Six adult females handled in the fall and following...
Abiotic and biotic controls of spatial pattern at alpine treeline
George P. Malanson, Ningchuan Xiao, K.J. Alftine, Mathew Bekker, David R. Butler, Daniel G. Brown, David M. Cairns, Daniel Fagre, Stephen J. Walsh
2000, Conference Paper, 4th International Conference on Integrating GIS and Environmental Modeling (GIS/EM4): Problems, Prospects and Research Needs
At alpine treeline, trees and krummholz forms affect the environment in ways that increase their growth and reproduction. We assess the way in which these positive feedbacks combine in spatial patterns to alter the environment in the neighborhood of existing plants. The research is significant because areas of alpine tundra...
Elk, beaver, and the persistence of willows in national parks: comment on Singer et al. (1998).
R.B. Keigley
2000, Wildlife Society Bulletin (28) 448-450
Singer et al. (1998) propose that the decline in populations of beaver (Castor canadensis) in Yellowstone National Park (YNP) has caused willow to be more vulnerable to browsing by clk (Alces alces). I do not believe that their scenario correctly characterizes the relationship between elk and willow in YNP The authors...
The phenology of space: Spatial aspects of bison density dependence in Yellowstone National Park
M.L. Taper, M. Meagher, C.L. Jerde
2000, Report
The Yellowstone bison represent the only bison population in the United States that survived in the wild the near-extermination of the late 1800's. This paper capitalizes on a unique opportunity provided by the record of the bison population of Yellowstone National Park (YNP). This population has been intensely monitored for...
Effect of browsing on willow in the Steel Creek grazing allotment
R.B. Keigley, Gil Gale
2000, Report, Statewide browse evaluation project: Report no. 1
The Steel Creek drainage serves as both wildlife range (primarily moose and elk) and as a livestock grazing allotment. For some years there has been concern about the effect of browsing on willows. Dense clusters of twigs have formed at the end of branches; entire stems of some plants have...
Phylogeography of mitochondrial DNA variation in brown bears and polar bears
Gerald F. Shields, Deborah Adams, Gerald W. Garner, Martine Labelle, Jacy Pietsch, Malcolm Ramsay, Charles Schwartz, Kimberly Titus, Scott Williamson
2000, Molecular Phylogenetics and Evolution (15) 319-326
We analyzed 286 nucleotides of the middle portion of the mitochondrial cytochrome b gene of 61 brown bears from three locations in Alaska and 55 polar bears from Arctic Canada and Arctic Siberia to test our earlier observations of paraphyly between polar bears and brown bears as well as to...
The Upper Midwest Aerospace Consortium Environmental Information Network: Building ‘Learning Communities’ in the Northern Great Plains
Leigh Welling, George Seielstad, Pat McClurg, Daniel B. Fagre
2000, Conference Paper
In the last two decades alone, the U.S. and large portions of the world have witnessed what can be aptly be described as an explosion of scientific information and technological innovations that has permeated almost every aspect of our lives. Given these trends, it is clear that science and the...
A paleolatitude approach to assessing surface temperature history for use in burial heating models
Charles E. Barker
2000, International Journal of Coal Geology (43) 121-135
Calculations using heat flow theory as well as case histories show that over geologic time scales (106 years), changes in mean annual surface temperature (Ts) on the order of 10°C penetrate kilometers deep into the crust. Thus, burial heating models of sedimentary basins, which typically span kilometers in depth and...
Future oil and gas resources of the world
Thomas S. Ahlbrandt, Ronald R. Charpentier, T. R. Klett, J. W. Schmoker, Christopher J. Schenk, G. F. Ulmishek
2000, Geotimes (45) 24-25
Physical modeling of a prototype slim-hold time-domain dielectric logging tool
J.D. Abraham
M. H. Powers, editor(s)
2000, Conference Paper, Proceedings of the symposium on the Application of geophysics to engineering and environmental problems
Influence of El Niño–Southern Oscillation (ENSO) events on the evolution of central California's shoreline
Curt D. Storlazzi, Gary B. Griggs
2000, Geological Society of America Bulletin (112) 236-249
Significant sea-cliff erosion and storm damage occurred along the central coast of California during the 1982–1983 and 1997–1998 El Niño winters. This generated interest among scientists and land-use planners in how historic El Niño–Southern Oscillation (ENSO) winters have affected the coastal climate of central California. A relative ENSO intensity index...
Where does the mud go?
Stephen L. Eittreim, Michael E. Field, Marlene Noble
2000, Report, Ecosystem Observations for the Monterey Bay National Marine Sanctuary 2000
No abstract available....
