Evaluation of fish sampling using rotenone in a navigation lock
F.J. Margraf, C.T. Knight
2002, Fisheries Research (55) 297-305
Annual sampling in locks with rotenone has been a principal means of assessing fish populations in the commercially navigable portions of the Ohio River. Despite extensive use, sampling in locks with rotenone and interpretation of the data obtained have not been adequately evaluated. The purpose of our study was to...
Modeling enhanced in situ denitrification in groundwater
M.W. Killingstad, M.A. Widdowson, R. L. Smith
2002, Journal of Environmental Engineering (128) 491-504
A two-dimensional numerical solute transport model was developed for simulating an enhanced in situ denitrification experiment performed in a nitrate-contaminated aquifer on Cape Cod, Massachusetts. In this experiment, formate (HCOO-)">(HCOO-) was injected for a period of 26 days into the carbon-limited aquifer to stimulate denitrification....
Accumulation rate and mixing of shelf sediments in the Monterey Bay National Marine Sanctuary
R.C. Lewis, K.H. Coale, B. D. Edwards, M. Marot, J.N. Douglas, E.J. Burton
2002, Marine Geology (181) 157-169
The distribution of excess 210Pb in 31 sediment cores was used to determine modern (last 100 yr) mass accumulation rates and the depth of sediment mixing on the continental shelf between Pacifica and Monterey, California, USA. Apparent mass accumulation rates average 0.27 g cm-2 yr-1 and range from 0.42 g...
The earthquake potential of the New Madrid seismic zone
Martitia P. Tuttle, Eugene S. Schweig, John D. Sims, Robert H. Lafferty III, Lorraine W. Wolf, Marion L. Haynes
2002, Bulletin of the Seismological Society of America (92) 2080-2089
The fault system responsible for New Madrid seismicity has generated temporally clustered very large earthquakes in A.D. 900 ± 100 years and A.D. 1450 ± 150 years as well as in 1811–1812. Given the uncertainties in dating liquefaction features, the time between the past three New Madrid events may be...
Subsurface fluid pressures from drill-stem tests, Uinta Basin, Utah
P. H. Nelson
2002, Mountain Geologist (39) 17-26
High fluid pressures are known to be associated with oil and gas fields in the Uinta Basin, Utah. Shut-in pressure measurements from drill-stem tests show how pressure varies with depth and by area within the basin. The data base used in this report incorporates over 2,000 pressure measurements from drill-stem...
Morphology, volcanism, and mass wasting in Crater Lake, Oregon
C. R. Bacon, J.V. Gardner, L. A. Mayer, M.W. Buktenica, P. Dartnell, D.W. Ramsey, J.E. Robinson
2002, Geological Society of America Bulletin (114) 675-692
Crater Lake was surveyed nearly to its shoreline by high-resolution multibeam echo sounding in order to define its geologic history and provide an accurate base map for research and monitoring surveys. The bathymetry and acoustic backscatter reveal the character of landforms and lead to a chronology for the concurrent filling...
Residency and movement patterns of wintering dunlin in the Willamette Valley of Oregon
Peter M. Sanzenbacher, Susan M. Haig
2002, Condor (104) 271-280
In the winters of 1998–1999 and 1999–2000, we tracked 67 radio-marked Dunlin (Calidris alpina) throughout the complex agricultural landscape of the Willamette Valley of Oregon. Individual birds were tracked across 8-week sampling periods and indicated a high degree of regional fidelity throughout the three winter sampling periods. Birds exhibited varied...
Fluvial sediment transport and deposition following the 1991 eruption of Mount Pinatubo
S.K. Hayes, D. R. Montgomery, C. G. Newhall
2002, Geomorphology (45) 211-224
The 1991 eruption of Mount Pinatubo generated extreme sediment yields from watersheds heavily impacted by pyroclastic flows. Bedload sampling in the Pasig-Potrero River, one of the most heavily impacted rivers, revealed negligible critical shear stress and very high transport rates that reflected an essentially unlimited sediment supply and the enhanced...
Absolute irradiance of the Moon for on-orbit calibration
T.C. Stone, H. H. Kieffer
Barnes W.L., editor(s)
2002, Conference Paper, Proceedings of SPIE - The International Society for Optical Engineering
The recognized need for on-orbit calibration of remote sensing imaging instruments drives the ROLO project effort to characterize the Moon for use as an absolute radiance source. For over 5 years the ground-based ROLO telescopes have acquired spatially-resolved lunar images in 23 VNIR (Moon diameter ???500 pixels) and 9 SWIR...
Nitrogen fixation in biological soil crusts from southeast Utah, USA
Jayne Belnap
2002, Biology and Fertility of Soils (35) 128-135
Biological soil crusts can be the dominant source of N for arid land ecosystems. We measured potential N fixation rates biweekly for 2 years, using three types of soil crusts: (1) crusts whose directly counted cells were >98% Microcoleus vaginatus (light crusts); (2) crusts dominated by M....
Emsian synorogenic paleogeography of the Maine Applachians
D. Bradley, R. Tucker
2002, Journal of Geology (110) 483-492
The Acadian deformation front in the northern Appalachians of Maine and New Hampshire can now be closely located during the early Emsian (Early Devonian; 408-406 Ma). Tight correlations between paleontologically and isotopically dated rocks are possible only because of a new 408-Ma time scale tie point for the early Emsian....
McCauley Sinks: A compound breccia pipe in evaporite karst, Holbrook Basin, Arizona, U.S.A
J.T. Neal, K.S. Johnson
2002, Carbonates and Evaporites (17) 98-106
The McCauley Sinks, in the Holbrook basin of northeastern Arizona, are comprised of some 50 individual sinkholes within a 3-km-wide depression. The sinks are grouped in a semi-concentric pattern of three nested rings. The outer ring is an apparent tension zone containing ring fractures. The two inner rings are semi-circular...
Annual emissions of mercury to the atmosphere from natural sources in Nevada and California
M.F. Coolbaugh, M.S. Gustin, J. J. Rytuba
2002, Environmental Geology (42) 338-349
The impact of natural source emissions on atmospheric mercury concentrations and the biogeochemical cycle of mercury is not known. To begin to assess this impact, mercury emissions to the atmosphere were scaled up for three areas naturally enriched in mercury: the Steamboat Springs geothermal area, Nevada, the New Idria mercury...
A bilinear source-scaling model for M-log a observations of continental earthquakes
Thomas C. Hanks, W. H. Bakun
2002, Bulletin of the Seismological Society of America (92) 1841-1846
The Wells and Coppersmith (1994) M-log A data set for continental earthquakes (where M is moment magnitude and A is fault area) and the regression lines derived from it are widely used in seismic hazard analysis for estimating M, given A. Their relations are well determined, whether for the full...
A landscape ecology approach to assessing development impacts in the tropics: A geothermal energy example in Hawaii
J. A. Griffith, C.C. Trettin, R. V. O’Neill
2002, Singapore Journal of Tropical Geography (23) 1-22
Geographic information systems (GIS) are increasingly being used in environmental impact assessments (EIA) because GIS is useful for analysing spatial impacts of various development scenarios. Spatially representing these impacts provides another tool for landscape ecology in environmental and geographical investigations by facilitating analysis of the effects of landscape patterns on...
Alien annual plants and their relationships to fire and biotic change in Sonoran Desertscrub
T. C. Esque, C.R. Schwalbe
B. Tellman, editor(s)
2002, Book chapter, Invasive exotic species in the Sonoran region
No abstract available....
Satellite imagery for volcanic hazards mitigation
Rosalind Tuthill Helz, G.A. Ellrod, G. Wadge
2002, Conference Paper, International Geoscience and Remote Sensing Symposium (IGARSS)
The Committee on Earth Observation Satellites (CEOS) seeks to foster cooperation to increase the usefulness and accessibility of satellite imagery. In 1997, CEOS initiated the Disaster Management Support Project to assess the present and potential use of satellite-derived information for volcanic hazards mitigation. The final report of the CEOS Volcanic...
Reproductive biology of four freshwater mussels (Bivalvia: Unionidae) endemic to eastern Gulf Coastal Plain drainages of Alabama, Florida, and Georgia
C. A. O’Brien, J.D. Williams
2002, American Malacological Bulletin (17) 147-158
The reproductive biology and glochidial shell morphology of three federally endangered freshwater mussels, the fat threeridge, Amblema neislerii; Gulf moccasinshell, Medionidus penicillatus; and oval pigtoe, Pleurobema pyriforme; and one federally threatened mussel, the purple bankclimber, Elliptoideus sloatianus, were studied from May 1995 to June 1997 in the Apalachicola, Flint, and...
Thallium isotope variations in seawater and hydrogenetic, diagenetic, and hydrothermal ferromanganese deposits
M. Rehkamper, M. Frank, J.R. Hein, D. Porcelli, A. Halliday, J. Ingri, V. Liebetrau
2002, Earth and Planetary Science Letters (197) 65-81
Results are presented for the first in-depth investigation of TI isotope variations in marine materials. The TI isotopic measurements were conducted by multiple collector-inductively coupled plasma mass spectrometry for a comprehensive suite of hydrogenetic ferromanganese crusts, diagenetic Fe-Mn nodules, hydrothermal manganese deposits and seawater samples. The natural variability of TI...
Response of old-growth conifers to reduction in stand density in western Oregon forests
P. Latham, J. C. Tappeiner II
2002, Tree Physiology (22) 137-146
The positive growth response of healthy young trees to density reduction is well known. In contrast, large old trees are usually thought to be intrinsically limited in their ability to respond to increased growing space; therefore, density reduction is seldom used in stands of old-growth trees. We tested the null...
Residual bias in a multiphase flow model calibration and prediction
E. P. Poeter, R.H. Johnson
2002, Acta Universitatis Carolinae, Geologica (46) 208-212
When calibrated models produce biased residuals, we assume it is due to an inaccurate conceptual model and revise the model, choosing the most representative model as the one with the best-fit and least biased residuals. However, if the calibration data are biased, we may fail to identify an acceptable model...
Evapotranspiration and canopy resistance at an undeveloped prairie in a humid subtropical climate
William R. Bidlake
2002, Journal of the American Water Resources Association (38) 197-211
Reliable estimates of evapotranspiration from areas of wildland vegetation are needed for many types of water-resource investigations. However, little is known about surface fluxes from many areally important vegetation types, and relatively few comparisons have been made to examine how well evapotranspiration models can predict evapotranspiration for soil-, climate-, or...
Earthquakes
S. E. Hough
2002, Geotimes (47) 12-17
[No abstract available]...
The hydrothermolysis of the picrate anion: Kinetics and mechanism
D.S. Ross, I. Jayaweera
2002, Thermochimica Acta (384) 155-162
The hydrothermolysis of the picrate anion in aqueous solution has been studied at 260-325??C in liquid water. At starting pH values above 12, the disappearance of picrate begins immediately and is first order in OH-. At lower pH, there is an induction period preceding the disappearance, and over the pH...
Response of benthic algae to environmental gradients in an agriculturally dominated landscape
M.D. Munn, R. W. Black, S.J. Gruber
2002, Journal of the North American Benthological Society (21) 221-237
Benthic algal communities were assessed in an agriculturally dominated landscape in the Central Columbia Plateau, Washington, to determine which environmental variables best explained species distributions, and whether algae species optima models were useful in predicting specific water-quality parameters. Land uses in the study area included forest, range, urban, and agriculture....
