Resolving global versus local/regional Pu sources in the environment using sector ICP-MS
M.E. Ketterer, K.M. Hafer, C.L. Link, D. Kolwaite, Jim Wilson, J.W. Mietelski
2004, Journal of Analytical Atomic Spectrometry (19) 241-245
Sector inductively coupled plasma mass spectrometry is a versatile method for the determination of plutonium activities and isotopic compositions in samples containing this element at fallout levels. Typical detection limits for 239+240Pu are 0.1, 0.02 and 0.002 Bq kg -1Pu for samples sizes of 0.5 g, 3 g, and 50...
Use of acoustic technology to aid in the regulation of Ross Barnett Reservoir near Jackson, Mississippi: Trials and tribulations
J.B. Storm
2004, Conference Paper, Joint Conference on Water Resource Engineering and Water Resources Planning and Management 2000: Building Partnerships
The U.S. Geological Survey is computing continuous discharge of the Pearl River at the upper end of the Ross Barnett Reservoir near Jackson, Mississippi, using acoustic technology and conventional streamgaging methods. The computed inflow is posted "real-time" to the Mississippi District's web page where it can be monitored by the...
Relative sea-level rise as indicated by gage data along the Mississippi and Alabama Gulf Coasts
K. Van Wilson Jr.
2004, Conference Paper, Bridging the Gap: Meeting the World's Water and Environmental Resources Challenges - Proceedings of the World Water and Environmental Resources Congress 2001
Global warming, or the increasing of earth's temperatures, leads to rising sea level as polar ice caps and mountain glaciers melt and ocean water undergoes thermal expansion. Tidal records collected by the U.S. Army Corps of Engineers (COE), Mobile District, at Gulfport, Biloxi, and Pascagoula, Mississippi, and at Mobile, Alabama,...
Brown bear response to elevated viewing structures at Brooks River, Alaska
T.D. DeBruyn, T. S. Smith, K. Proffitt, S. Partridge, T.D. Drummer
2004, Conference Paper, Wildlife Society Bulletin
The increasing popularity of brown bear (Ursus arctos) viewing at Brooks River in Katmai National Park, Alaska has resulted in overcrowded facilities, increasing bear-human conflicts, displacement of bears from important habitats, and degradation of cultural resources. To partially address these issues, the National Park Service (NPS) constructed a 300-m-long elevated...
Density dependence and risk of extinction in a small population of sea otters
L.R. Gerber, K.E. Buenau, G. VanBlaricom
2004, Biodiversity and Conservation (13) 2741-2757
Sea otters (Enhydra lutris (L.)) were hunted to extinction off the coast of Washington State early in the 20th century. A new population was established by translocations from Alaska in 1969 and 1970. The population, currently numbering at least 550 animals, A major threat to the population is the ongoing...
Precarious rock and overturned transformer evidence for ground shaking in the Ms 7.7 Kern County earthquake: An analog for disastrous shaking from a major thrust fault in the Los Angeles basin
J.N. Brune, A. Anooshehpoor, B. Shi, Yen Zheng
2004, Bulletin of the Seismological Society of America (94) 1993-2003
Precariously balanced rocks and overturned transformers in the vicinity of the White Wolf fault provide constraints on ground motion during the 1952 Ms 7.7 Kern County earthquake, a possible analog for an anticipated large earthquake in the Los Angeles basin (Shaw et al., 2002; Dolan et al., 2003). On the...
Source and redox controls on metallogenic variations in intrusion-related ore systems, Tombstone-Tungsten Belt, Yukon Territory, Canada
C.J.R. Hart, J.L. Mair, R.J. Goldfarb, D.I. Groves
2004, Conference Paper, Special Paper of the Geological Society of America
The Tombstone, Mayo and Tungsten plutonic suites of granitic intrusions, collectively termed the Tombstone-Tungsten Belt, form three geographically, mineralogically, geochemically and metallogenically distinct plutonic suites. The granites (sensu lato) intruded the ancient North American continental margin of the northern Canadian Cordillera as part of a single magmatic episode in the...
Hydrology, metals, and aquatic physical habitat in the Upper Animas watershed, Colorado
R.T. Milhous
2004, Conference Paper, Watershed Management and Operations Management 2000
The Upper Animas River watershed in southwestern Colorado is a watershed with historic mining districts with many small mines and mills and a few larger mines and mills. The numbers of trout may be limited by high flows during the spring runoff period and by winter streamflows. In some locations...
Observed and simulated ground motions in the San Bernardino basin region for the Hector Mine, California, earthquake
R.W. Graves, D.J. Wald
2004, Bulletin of the Seismological Society of America (94) 131-146
During the MW 7.1 Hector Mine earthquake, peak ground velocities recorded at sites in the central San Bernardino basin region were up to 2 times larger and had significantly longer durations of strong shaking than sites just outside the basin. To better understand the effects of 3D structure on the...
Improving wetland simulations by including heat transport in groundwater flow modeling
Hector R. Bravo, F. Jiang, R. J. Hunt
2004, Conference Paper, Joint Conference on Water Resource Engineering and Water Resources Planning and Management 2000: Building Partnerships
A procedure was developed to automatically calibrate a groundwater flow and heat transport model, resulting in the estimation of hydraulic conductivity and flux across the water table in wetland systems. This paper describes differences between previous approaches and this study, and summarizes some challenges in the method implementation. The procedure...
Genotoxicity in native fish associated with agricultural runoff events
Andrew Whitehead, Kathryn Kuivila, James L. Orlando, S. Kotelevtsev, Susan L. Anderson
2004, Environmental Toxicology and Chemistry (23) 2868-2877
The primary objective of the present study was to test whether agricultural chemical runoff was associated with in-stream genotoxicity in native fish. Using Sacramento sucker (Catostomus occidentalis), we combined field-caging experiments in an agriculturally dominated watershed with controlled laboratory exposures to field-collected water samples, and we coupled genotoxicity biomarker measurements...
Field investigation into unsaturated flow and transport in a fault: Model analyses
H.-H. Liu, R. Salve, J.-S. Wang, G.S. Bodvarsson, D. Hudson
2004, Journal of Contaminant Hydrology (74) 39-59
Results of a fault test performed in the unsaturated zone of Yucca Mountain, Nevada, were analyzed using a three-dimensional numerical model. The fault was explicitly represented as a discrete feature and the surrounding rock was treated as a dual-continuum (fracture-matrix) system. Model calibration against seepage and water-travel-velocity data suggests that...
Sequence stratigraphy of the Kingak Shale (Jurassic-Lower Cretaceous), National Petroleum Reserve in Alaska
D.W. Houseknecht, K. J. Bird
2004, American Association of Petroleum Geologists Bulletin (88) 279-302
Beaufortian strata (Jurassic-Lower Cretaceous) in the National Petroleum Reserve in Alaska (NPRA) are a focus of exploration since the 1994 discovery of the nearby Alpine oil field (>400 MMBO). These strata include the Kingak Shale, a succession of depositional sequences influenced by rift opening of the Arctic Ocean Basin. Interpretation...
Allegheny woodrat (Neotoma magister) use of rock drainage channels on reclaimed mines in southern West Virginia
H.D. Chamblin, P.B. Wood, J.W. Edwards
2004, American Midland Naturalist (151) 346-354
Allegheny woodrats (Neotoma magister) currently receive protected status throughout their range due to population declines. Threats associated with habitat fragmentation (e.g., introduced predators, disease, loss of connectivity among subpopulations and habitat loss) may explain why Allegheny woodrats are no longer found in many areas where they existed just 25 y...
Mars chronology: Assessing techniques for quantifying surficial processes
P.T. Doran, S.M. Clifford, S.L. Forman, Larry Nyquist, D.A. Papanastassiou, B.W. Stewart, N.C. Sturchio, T. D. Swindle, T. Cerling, J. Kargel, G. McDonald, K. Nishiizumi, R. Poreda, J.W. Rice, K. Tanaka
2004, Earth-Science Reviews (67) 313-337
Currently, the absolute chronology of Martian rocks, deposits and events is based mainly on crater counting and remains highly imprecise with epoch boundary uncertainties in excess of 2 billion years. Answers to key questions concerning the comparative origin and evolution of Mars and Earth will not be forthcoming without a...
Movements of flightless long-tailed ducks during wing molt
Paul L. Flint, Deborah L. Lacroix, John A. Reed, Richard B. Lanctot
2004, Waterbirds (27) 35-40
We examined the movements of flightless Long-tailed Ducks (Clangula hyemalis) during the wing molt in the near-shore lagoons of the Beaufort Sea in Alaska. Estimates of site fidelity during the 21-day flightless period ranged from 1-100%, with considerable variation among locations and within locations among years. There was no effect...
The nucleus of Comet Borrelly: A study of morphology and surface brightness
J. Oberst, Elpitha Howington-Kraus, Randolph L. Kirk, Laurence A. Soderblom, B. Buratti, M. Hicks, R. Nelson, D. Britt
2004, Icarus (167) 70-79
Stereo images obtained during the DS1 flyby were analyzed to derive a topographic model for the nucleus of Comet 19P/Borrelly for morphologic and photometric studies. The elongated nucleus has an overall concave shape, resembling a peanut, with the lower end tilted towards the camera. The bimodal character of surface-slopes and...
The flora of the Cottonwood Lake Study Area, Stutsman County, North Dakota
D.M. Mushet, N.H. Euliss Jr., S.P. Lane, C.M. Goldade
2004, Prairie Naturalist (36) 43-62
The 92 ha Cottonwood Lake Study Area is located in south-central North Dakota along the eastern edge of a glacial stagnation moraine known as the Missouri Coteau. The study area has been the focus of biologic and hydrologic research since the U.S. Fish and Wildlife Service purchased the site in...
Changes in snowmelt runoff timing in western North America under a 'business as usual' climate change scenario
I.T. Stewart, Daniel Cayan, Michael D. Dettinger
2004, Climatic Change (62) 217-232
Spring snowmelt is the most important contribution of many rivers in western North America. If climate changes, this contribution may change. A shift in the timing of springtime snowmelt towards earlier in the year already is observed during 1948-2000 in many western rivers. Streamflow timing changes for the 1995-2099 period...
Impacts of water development on aquatic macroinvertebrates, amphibians, and plants in wetlands of a semi-arid landscape
Ned H. Euliss Jr., David M. Mushet
2004, Aquatic Ecosystem Health & Management (7) 73-84
We compared the macroinvertebrate and amphibian communities of 12 excavated and 12 natural wetlands in western North Dakota, USA, to assess the effects of artificially lengthened hydroperiods on the biotic communities of wetlands in this semi-arid region. Excavated wetlands were much deeper and captured greater volumes of water than natural...
Hydrologic and hydraulic factors affecting passage of paddlefish through dams in the Upper Mississippi River
S. J. Zigler, M. R. Dewey, B.C. Knights, A.L. Runstrom, M.T. Steingraeber
2004, Transactions of the American Fisheries Society (133) 160-172
Populations of paddlefish Polyodon spathula have been adversely affected by dams that can block their movements. Unlike high-head dams that preclude fish passage (unless they are equipped with fishways), the dams on the upper Mississippi River are typically low-head dams with bottom release gates that may allow fish passage under...
Laboratory observations of red imported fire ant (Hymenoptera: Formicidae) predation upon eastern tent caterpillars (Lepidoptera: Lasiocampidae)
A.S. Garmestani, Craig R. Allen, J.A. LaBram, A.E. Peck
2004, Journal of Entomological Science (39) 472-473
No abstract available....
Occurrence of hexavalent chromium in ground water in the western Mojave Desert, California
J.W. Ball, J. A. Izbicki
2004, Applied Geochemistry (19) 1123-1135
About 200 samples from selected public supply, domestic, and observation wells completed in alluvial aquifers underlying the western Mojave Desert were analyzed for total dissolved Cr and Cr(VI). Because Cr(VI) is difficult to preserve, samples were analyzed by 3 methods. Chromium(VI) was determined in the field using both a direct...
Validation of two dilution models to predict chloramine-T concentrations in aquaculture facility effluent
M.P. Gaikowski, W.J. Larson, J. J. Steuer, W.H. Gingerich
2004, Aquacultural Engineering (30) 127-140
Accurate estimates of drug concentrations in hatchery effluent are critical to assess the environmental risk of hatchery drug discharge resulting from disease treatment. This study validated two dilution simple n models to estimate chloramine-T environmental introduction concentrations by comparing measured and predicted chloramine-T concentrations using the US Geological Survey's Upper...
The helium isotopic chemistry of Lake Bonney, Taylor Valley, Antarctica: Timing of late holocene climate change in Antarctica
R.J. Poreda, A.G. Hunt, Lyons W. Berry, K.A. Welch
2004, Aquatic Geochemistry (10) 353-371
To better understand the long-term climate history of Antarctica, we studied Lake Bonney in Taylor Valley, Southern Victoria Land (78?? S). Helium isotope ratios and He, Ne, Ar and N2 concentration data, obtained from hydrocasts in the East (ELB) and West (WLB) Lobesof Lake Bonney, provided important constraints on the...
