Geoelectrical structure of the central zone of Piton de la Fournaise volcano (Reunion)
J.-F. Lenat, D. Fitterman, D. B. Jackson, P. Labazuy
2000, Bulletin of Volcanology (62) 75-89
A study of the geoelectrical structure of the central part of Piton de la Fournaise volcano (Reunion, Indian Ocean) was made using direct current electrical (DC) and transient electromagnetic soundings (TEM). Piton de la Fournaise is a highly active oceanic basaltic shield and has been active for more than half...
Quantitative model of the growth of floodplains by vertical accretion
J. A. Moody, B.M. Troutman
2000, Earth Surface Processes and Landforms (25) 115-133
A simple one-dimensional model is developed to quantitatively predict the change in elevation, over a period of decades, for vertically accreting floodplains. This unsteady model approximates the monotonic growth of a floodplain as an incremental but constant increase of net sediment deposition per flood for those floods of a partial...
Water quality modeling in the systems impact assessment model for the Klamath River basin - Keno, Oregon to Seiad Valley, California
R. Blair Hanna, Sharon G. Campbell
2000, Open-File Report 99-113
This report describes the water quality model developed for the Klamath River System Impact Assessment Model (SIAM). The Klamath River SIAM is a decision support system developed by the authors and other US Geological Survey (USGS), Midcontinent Ecological Science Center staff to study the effects of basin-wide water management decisions...
Paleoearthquake recurrence on the East Paradise fault zone, metropolitan Albuquerque, New Mexico
Stephen F. Personius, Shannon Mahan
2000, Bulletin of the Seismological Society of America (90) 357-369
A fortuitous exposure of the East Paradise fault zone near Arroyo de las Calabacillas has helped us determine a post-middle Pleistocene history for a long-forgotten Quaternary fault in the City of Albuquerque, New Mexico. Mapping of two exposures of the fault zone allowed us to measure a total vertical offset...
Application of GPS and GIS to map channel features in Walnut Creek, Iowa
K. E. Schilling, C.F. Wolter
2000, Journal of the American Water Resources Association (36) 1423-1434
A 12-km reach of Walnut Creek was mapped at the Neal Smith National Wildlife Refuge in Jasper County, Iowa to identify and prioritize areas of the stream channel in need of further investigation or restoration. Channel features, including streambank conditions, bottom sediment materials and thickness, channel cross-sections, debris dams, tile...
A test of a climatic index of dune mobility using measurements from the southwestern United States
N. Lancaster, P. Helm
2000, Earth Surface Processes and Landforms (25) 197-207
The climatic index of dune mobility developed by Lancaster (1988) has been applied to a variety of different environments. The index is, however, untested and unverified. We tested the index by comparison of values of the dune mobility index calculated from climate data with rates of sand transport measured at...
Genetic diversity and epidemiology of infectious hematopoietic necrosis virus in Alaska
E.G Emmenegger, T.R. Meyers, T.O. Burton, Gael Kurath
2000, Diseases of Aquatic Organisms (40) 163-176
Forty-two infectious hematopoietic necrosis virus (IHNV) isolates from Alaska were analyzed using the ribonuclease protection assay (RPA) and nucleotide sequencing. RPA analyses, utilizing 4 probes, N5, N3 (N gene), GF (G gene), and NV (NV gene), determined that the haplotypes of all 3 genes demonstrated a consistent spatial pattern. Virus...
Reservoir characterization of marine and permafrost associated gas hydrate accumulations with downhole well logs
T. S. Collett, Myung W. Lee
2000, Conference Paper, Annals of the New York Academy of Sciences
Gas volumes that may be attributed to a gas hydrate accumulation depend on a number of reservoir parameters, one of which, gas-hydrate saturation, can be assessed with data obtained from downhole well-logging devices. This study demonstrates that electrical resistivity and acoustic transit-time downhole log data can be used to quantify...
Spatial modeling of the geographic distribution of wildlife populations: A case study in the lower Mississippi River region
W. Ji, C. Jeske
2000, Ecological Modelling (132) 95-104
A geographic information system (GIS)-based spatial modeling approach was developed to study environmental and land use impacts on the geographic distribution of wintering northern pintails (Arias acuta) in the Lower Mississippi River region. Pintails were fitted with backpack radio transmitter packages at Catahoula Lake, LA, in October 1992-1994 and located...
Chronological refinement of an ice core record at Upper Fremont Glacier in south central North America
P. F. Schuster, D. E. White, D. L. Naftz, L.D. Cecil
2000, Journal of Geophysical Research D: Atmospheres (105) 4657-4666
The potential to use ice cores from alpine glaciers in the midlatitudes to reconstruct paleoclimatic records has not been widely recognized. Although excellent paleoclimatic records exist for the polar regions, paleoclimatic ice core records are not common from midlatitude locations. An ice core removed from the Upper Fremont Glacier in...
Development of a global land cover characteristics database and IGBP DISCover from 1 km AVHRR data
Thomas R. Loveland, B. C. Reed, Jesslyn F. Brown, D.O. Ohlen, Z. Zhu, L. Yang, J.W. Merchant
2000, International Journal of Remote Sensing (21) 1303-1330
Researchers from the U.S. Geological Survey, University of Nebraska-Lincoln and the European Commission's Joint Research Centre, Ispra, Italy produced a 1 km resolution global land cover characteristics database for use in a wide range of continental-to global-scale environmental studies. This database provides a unique view of the broad patterns of...
A surface-associated activity trap for capturing water-surface and aquatic invertebrates in wetlands
Mark A. Hanson, Christiane C. Roy, Ned Euliss, Kyle D. Zimmer, Michael R. Riggs, Malcolm G. Butler
2000, Wetlands (20) 205-212
We developed a surface-associated activity trap (SAT) for sampling aquatic invertebrates in wetlands. We compared performance of this trap with that of a conventional activity trap (AT) based on non-detection rates and relative abundance estimates for 13 taxa of common wetland invertebrates and for taxon richness using data from experiments...
A new approach toward evaluation of fish bioenergetics models
Charles P. Madenjian, Daniel V. O’Connor, David A. Nortrup
2000, Canadian Journal of Fisheries and Aquatic Sciences (57) 1025-1032
A new approach was used to evaluate the Wisconsin bioenergetics model for lake trout (Salvelinus namaycush). Lake trout in laboratory tanks were fed alewife (Alosa pseudoharengus) and rainbow smelt (Osmerus mordax), prey typical of lake trout in Lake Michigan. Food consumption and growth by lake trout during the...
Geochemistry of the Springfield Plateau aquifer of the Ozark Plateaus Province in Arkansas, Kansas, Missouri and Oklahoma, USA
J.C. Adamski
2000, Hydrological Processes (14) 849-866
Geochemical data indicate that the Springfield Plateau aquifer, a carbonate aquifer of the Ozark Plateaus Province in central USA, has two distinct hydrochemical zones. Within each hydrochemical zone, water from springs is geochemically and isotopically different than water from wells. Geochemical data indicate that spring water generally interacts less with...
Seasonal-range forecasting of the ozark climate by a principal component regression scheme with antecedent sea surface temperatures and upper air conditions
J.W. Lee, E.C. Kung
2000, Atmósfera (13) 223-244
On the basis of principal component analysis of long-term climatological records, regression models are formulated and forecast experiments are conducted for monthly temperature and precipitation of the Ozark Highlands area, a large area of low mountains and plateau in the south central midwestern United States. Predictors include global sea surface...
Energy budgets of mining-induced earthquakes and their interactions with nearby stopes
Art McGarr
2000, Conference Paper, International Journal of Rock Mechanics and Mining Sciences
In the early 1960's, N.G.W. Cook, using an underground network of geophones, demonstrated that most Witwatersrand tremors are closely associated with deep level gold mining operations. He also showed that the energy released by the closure of the tabular stopes at depths of the order of 2 km was more...
Nitrogen flux and sources in the Mississippi River Basin
D. A. Goolsby, W.A. Battaglin, Brent T. Aulenbach, R. P. Hooper
2000, Science of Total Environment (248) 75-86
Nitrogen from the Mississippi River Basin is believed to be at least partly responsible for the large zone of oxygen-depleted water that develops in the Gulf of Mexico each summer. Historical data show that concentrations of nitrate in the Mississippi River and some of...
Do wolves affect white-tailed buck harvest in northeastern Minnesota?
L. David Mech, Michael E. Nelson
2000, Journal of Wildlife Management (64) 129-136
We used simple linear regression to analyze 8-23 years of data on a wolf (Canis lupus) population and human harvest of white-tailed deer (Odocoileus virginianus) bucks in northeastern Minnesota to determine any effects of wolves on buck harvesting. Over the long term, wolves accounted for at least 14-22% of the...
Identifying populations potentially exposed to agricultural pesticides using remote sensing and a Geographic Information System
Mary H. Ward, John R. Nuckols, Stephanie J. Weigel, Susan K. Maxwell, Kenneth P. Cantor, Ryan S. Miller
2000, Environmental Health Perspectives (108) 5-12
Pesticides used in agriculture may cause adverse health effects among the population living near agricultural areas. However, identifying the populations most likely to be exposed is difficult. We conducted a feasibility study to determine whether satellite imagery could be used to reconstruct historical crop patterns. We used historical Farm Service...
Estimating effects of constraints on plant performance with regression quantiles
B.S. Cade, Q. Guo
2000, Oikos (91) 245-254
Rates of change in final summer densities of two desert annuals, Eriogonum abertianum and Haplopappus gracilis, as constrained by their initial winter germination densities were estimated with regression quantiles and compared with mechanistic fits based on a self-thinning rule proposed by Guo et al. (1998); Oikos 83: 237–245). The allometric...
Hydrogeologic setting and potential for denitrification in ground water, Coastal Plain of southern Maryland
David E. Krantz, David S. Powars
2000, Water-Resources Investigations Report 2000-4051
The types and distribution of Coastal Plain sediments in the Patuxent River Basin may contribute to relatively low concentrations of nitrate (typically less than 1 milligram per liter) in stream base flow because of the chemical reduction of dissolved nitrate (denitrification) in ground water. Water chemistry data from synoptic stream...
Non-destructive measurement of soil liquefaction density change by crosshole radar tomography, Treasure Island, California
Robert E. Kayen, Walter A. Barnhardt, Scott Ashford, Kyle Rollins
2000, Book, Proceedings of Sessions of Geo-Denver 2000 - Computer Simulation of Earthquake Effects, GSP 110
A ground penetrating radar (GPR) experiment at the Treasure Island Test Site [TILT] was performed to non-destructively image the soil column for changes in density prior to, and following, a liquefaction event. The intervening liquefaction was achieved by controlled blasting. A geotechnical borehole radar technique was used to acquire high-resolution...
Nutrient concentrations and yields in undeveloped stream basins of the United States
G. M. Clark, D. K. Mueller, M.A. Mast
2000, Journal of the American Water Resources Association (36) 849-867
Data from 85 sites across the United States were used to estimate concentrations and yields of selected nutrients in streams draining relatively undeveloped basins. Flow-weighted concentrations during 1990-1995 were generally low with median basin concentrations of 0.020, 0.087, 0.26, 0.010, and 0.022 milligrams per liter (mg/L) for ammonia as N,...
Estimating formation properties from early-time oscillatory water levels in a pumped well
A.M. Shapiro, D.S. Oki
2000, Journal of Hydrology (236) 91-108
Hydrologists often attempt to estimate formation properties from aquifer tests for which only the hydraulic responses in a pumped well are available. Borehole storage, turbulent head losses, and borehole skin, however, can mask the hydraulic behavior of the formation inferred from the water level in the pumped well. Also, in...
Using imaging spectroscopy to map acidic mine waste
G.A. Swayze, K. S. Smith, R. N. Clark, S. J. Sutley, R.M. Pearson, J.S. Vance, P. L. Hageman, Paul H. Briggs, A. L. Meier, M.J. Singleton, S. Roth
2000, Environmental Science & Technology (34) 47-54
The process of pyrite oxidation at the surface of mine waste may produce acidic water that is gradually neutralized as it drains away from the waste, depositing different Fe-bearing secondary minerals in roughly concentric zones that emanate from mine-waste piles. These Fe-bearing minerals are indicators of the geochemical conditions under...
