Application of a new model for groundwater age distributions: Modeling and isotopic analysis of artificial recharge in the Rialto-Colton basin, California
T.R. Ginn, L. Woolfenden
2002, Report - University of California Water Resources Center 15-17
A project for modeling and isotopic analysis of artificial recharge in the Rialto-Colton basin aquifer in California, is discussed. The Rialto-Colton aquifer has been divided into four primary and significant flowpaths following the general direction of groundwater flow from NW to SE. The introductory investigation include sophisticated chemical reaction modeling,...
Movement of atrazine and deethylatrazine through a midwestern reservoir
J. D. Fallon, D.P. Tierney, E.M. Thurman
2002, Journal - American Water Works Association (94) 54-66
The three-dimensional visualization of atrazine and deethylatrazine in a reservoir was determined by five "snapshots" over a one-year period using immunoassay analyses, confirmed by gas chromatography-mass spectrometry and visualized with a three-dimensional computer program. The surveys were conducted in Perry Lake in Kansas and showed that spring runoff laden with...
Deep arid system hydrodynamics 2. Application to paleohydrologic reconstruction using vadose zone profiles from the northern Mojave Desert
Michelle Ann Walvoord, Fred M. Phillips, Scott W. Tyler, Peter C. Hartsough
2002, Water Resources Research (38) 27-1-27-12
Site‐specific numerical modeling of four sites in two arid alluvial basins within the Nevada Test Site employs a conceptual model of deep arid system hydrodynamics that includes vapor transport, the role of xeric vegetation, and long‐term surface boundary transients. Surface boundary sequences, spanning 110 kyr, that best reproduce measured chloride...
Survey of aquatic macroinvertebrates and amphibians at Wupatki National Monument, Arizona, USA: An evaluation of selected factors affecting species richness in ephemeral pools
T. B. Graham
2002, Conference Paper, Hydrobiologia
Ephemeral aquatic habitats in Wupatki National Monument vary from naturally formed pools in arroyos over 5000 years old, to constructed catchment basins with ages estimated at 60-1000+ years old, and borrow pits and stock ponds 30-60 years old. The different ages of these pools provide different histories of colonization by...
Ontogenetic improvement of visual function in the medaka Oryzias latipes based on an optomotor testing system for larval and adult fish
Paulo S. M. Carvalho, Douglas B. Noltie, D. E. Tillitt
2002, Animal Behaviour (64) 1-10
We developed a system for evaluation of visual function in larval and adult fish. Both optomotor (swimming) and optokinetic (eye movement) responses were monitored and recorded using a system of rotating stripes. The system allowed manipulation of factors such as width of the stripes used, rotation speed of the striped...
Helium and carbon gas geochemistry of pore fluids from the sediment-rich hydrothermal system in Escanaba Trough
J.-I. Ishibashi, M. Sato, Y. Sano, H. Wakita, T. Gamo, Wayne C. Shanks III
2002, Applied Geochemistry (17) 1457-1466
Ocean Drilling Program (ODP) Leg 169, which was conducted in 1996 provided an opportunity to study the gas geochemistry in the deeper part of the sediment-rich hydrothermal system in Escanaba Trough. Gas void samples obtained from the core liner were analyzed and their results were compared with analytical data of...
Reduction of provisioning effort in response to experimental manipulation of chick nutritional status in the Horned Puffin
A.M.A. Harding, Thomas I. van Pelt, John F. Piatt, A.S. Kitaysky
2002, Condor (104) 842-847
Using a supplemental feeding experiment, we investigated the ability of adult Horned Puffins to decrease provisioning effort in response to reduced nutritional requirements of chicks. We found no difference between experimental and control groups in parental provisioning before supplementary feeding was initiated. After receiving supplemental food for seven days, experimental...
Nitrogen dynamics in an Alaskan salt marsh following spring use by geese
Amy B. Zacheis, Roger W. Ruess, Jerry W. Hupp
2002, Oecologia (130) 600-608
Lesser snow geese (Anser caerulescens caerulescens) and Canada geese (Branta canadensis) use several salt marshes in Cook Inlet, Alaska, as stopover areas for brief periods during spring migration. We investigated the effects of geese on nitrogen cycling processes in Susitna Flats, one of the marshes. We...
Spatial and temporal deformation along the northern San Jacinto fault, southern California: Implications for slip rates
K.J. Kendrick, D. M. Morton, S. G. Wells, R.W. Simpson
2002, Bulletin of the Seismological Society of America (92) 2782-2802
The San Timoteo badlands is an area of uplift and erosional dissection that has formed as a result of late Quaternary uplift along a restraining bend in the San Jacinto fault, of the San Andreas fault system in southern California. This bend currently is located in a region where late...
Integrated management of waterbirds: Beyond the conventional
R.M. Erwin
2002, Waterbirds (25) 5-12
Integrated waterbird management over the past few decades has implicitly referred to methods for managing wetlands that usually attempt to enhance habitat for taxonomic groups such as shorebirds and wading birds, in addition to waterfowl, the traditional focus group. Here I describe five elements of integration in management: taxonomic, spatial,...
The growth-temperature relation and preferred temperatures of juvenile lake herring
T.A. Edsall, T.J. Desorcie
2002, Advances in Limnology (57) 335-342
Lake herring, Coregonus artedi, were once extremely abundant in the Great Lakes where they functioned as a major trophic integrator, directly linking the planktonic crustacean resource to lake trout. Salvelinus namaycush. Lake herring populations in the Great Lakes collapsed during the middle third of the 20th century due to overfishing,...
Strain accumulation and rotation in western Nevada, 1993-2000
J. L. Svarc, J.C. Savage, W.H. Prescott, A. R. Ramelli
2002, Journal of Geophysical Research B: Solid Earth (107) ETG 2-1-ETG 2-11
The positions of 44 GPS monuments in an array extending from the Sierra Nevada at the latitude of Reno to near Austin, Nevada, have been measured several times in the 1993–2000 interval. The western half of the array spans the Walker Lane belt, whereas the eastern half spans the central...
Estimating terrestrial snow depth with the Topex-Poseidon altimeter and radiometer
F. Papa, B. Legresy, N. M. Mognard, E.G. Josberger, F. Remy
2002, IEEE Transactions on Geoscience and Remote Sensing (40) 2162-2169
Active and passive microwave measurements obtained by the dual-frequency Topex-Poseidon radar altimeter from the Northern Great Plains of the United States are used to develop a snow pack radar backscatter model. The model results are compared with daily time series of surface snow observations made by the U.S. National Weather...
Monitoring artificially stimulated fluid movement in the Cretaceous Dakota aquifer, western Kansas
P. A. Macfarlane, A. Forster, D. F. Merriam, J. Schrotter, J.M. Healey
2002, Hydrogeology Journal (10) 662-673
Aquifer properties can be evaluated by monitoring artificially stimulated fluid movements between wells, if the fluid is heated. Changes in the temperature profile recorded in observation wells indicate the flow path of the heated fluid, which in effect acts as a tracer. A fluid-flow experiment in the Cretaceous Dakota Formation...
Epizootiology of sixty-four amphibian morbidity and mortality events in the USA, 1996-2001
D. E. Green, K. A. Converse, A.K. Schrader
2002, Conference Paper, Annals of the New York Academy of Sciences
A total of 44 amphibian mortality events and 20 morbidity events were reviewed retrospectively. The most common cause of amphibian mortality events was infection by ranaviruses (Family: Iridoviridae). Ranavirus epizootics have abrupt onset and affect late-stage larvae and recent metamorphs. Mortality events due to ranavirus infections affected only widespread and...
Survival models for harvest management of mourning dove populations
David L. Otis
2002, Journal of Wildlife Management (66) 1052-1063
Quantitative models of the relationship between annual survival and harvest rate of migratory game-bird populations are essential to science-based harvest management strategies. I used the best available band-recovery and harvest data for mourning doves (Zenaida macroura) to build a set of models based on different assumptions about compensatory harvest mortality....
Weak trophic interactions among birds, insects and white oak saplings (Quercus alba)
J.S. Lichtenberg, D.A. Lichtenberg
2002, American Midland Naturalist (148) 338-349
We examined the interactions among insectivorous birds, arthropods and white oak saplings (Quercus alba L.) in a temperate deciduous forest under 'open' and 'closed' canopy environments. For 2 y, we compared arthropod densities, leaf damage and sapling growth. Saplings from each canopy environment were assigned to one of four treatments:...
Investigating landslides caused by earthquakes - A historical review
D. K. Keefer
2002, Surveys in Geophysics (23) 473-510
Post-earthquake field investigations of landslide occurrence have provided a basis for understanding, evaluating, and mapping the hazard and risk associated with earthquake-induced landslides. This paper traces the historical development of knowledge derived from these investigations. Before 1783, historical accounts of the occurrence of landslides in earthquake are typically so incomplete...
Achieving sub-pixel geolocation accuracy in support of MODIS land science
R.E. Wolfe, M. Nishihama, A.J. Fleig, J.A. Kuyper, David P. Roy, James C. Storey, F.S. Patt
2002, Remote Sensing of Environment (83) 31-49
The Moderate Resolution Imaging Spectroradiometer (MODIS) was launched in December 1999 on the polar orbiting Terra spacecraft and since February 2000 has been acquiring daily global data in 36 spectral bands—29 with 1 km, five with 500 m, and two with 250 m nadir pixel dimensions. The Terra satellite has...
Evaluation of Light Detection and Ranging (LIDAR) for measuring river corridor topography
Z.H. Bowen, R.G. Waltermire
2002, Journal of the American Water Resources Association (38) 33-41
LIDAR is relatively new in the commercial market for remote sensing of topography and it is difficult to find objective reporting on the accuracy of LIDAR measurements in an applied context. Accuracy specifications for LIDAR data in published evaluations range from 1 to 2 m root mean square error (RMSEx,y)...
Coastal geoindicators of environmental change in the humid tropics
R.A. Morton
2002, Environmental Geology (42) 711-724
The primary geoindicators appropriate for monitoring environmental changes in the humid tropics are transitory surface water levels, shoreline position, wetlands distribution, coral reefs, landforms, and sediment sequence and composition. Lateral zonations and temporal successions of vegetation also can be used as geoindicators of riverine and shoreline changes. All of these...
Waveform inversion of oscillatory signatures in long-period events beneath volcanoes
Hiroyuki Kumagai, B. A. Chouet, M. Nakano
2002, Journal of Geophysical Research B: Solid Earth (107) ESE 7-1-ESE 7-13
The source mechanism of long-period (LP) events is examined using synthetic waveforms generated by the acoustic resonance of a fluid-filled crack. We perform a series of numerical tests in which the oscillatory signatures of synthetic LP waveforms are used to determine the source time functions of the six moment tensor...
Nitrogen in rock: Occurrences and biogeochemical implications
J.M. Holloway, R.A. Dahlgren
2002, Global Biogeochemical Cycles (16) 65-1-65-17
There is a growing interest in the role of bedrock in global nitrogen cycling and potential for increased ecosystem sensitivity to human impacts in terrains with elevated background nitrogen concentrations. Nitrogen-bearing rocks are globally distributed and comprise a potentially large pool of nitrogen in nutrient cycling that is frequently neglected...
Spatial scale analysis in geophysics - Integrating surface and borehole geophysics in groundwater studies
Frederick L. Paillet
V.H. Singhroy, D.T. Hansen, R.R. Pierce, A.I. Johnson, editor(s)
2002, Conference Paper, ASTM Special Technical Publication
Integration of geophysical data obtained at various scales can bridge the gap between localized data from boreholes and site-wide data from regional survey profiles. Specific approaches to such analysis include: 1) comparing geophysical measurements in boreholes with the same measurement made from the surface; 2) regressing geophysical data obtained in...
Late Quaternary evolution of the San Antonio Submarine Canyon in the central Chile forearc (∼33°S)
Jane Laursen, William R. Normark
2002, Marine Geology (188) 365-390
Hydrosweep swath-bathymetry and seismic-reflection data reveal the morphology, sedimentary processes, and structural controls on the submarine San Antonio Canyon. The canyon crosses the forearc slope of the central Chile margin for more than 150 km before it empties into the Chile Trench near 33°S latitude....
