A predictive penetrative fracture mapping method from regional potential field and geologic datasets, southwest Colorado Plateau, U.S.A.
Mark E. Gettings, Mark Bultman
2005, Earth, Planets and Space (57) 701-715
Some aquifers of the southwest Colorado Plateau, U.S.A., are deeply buried and overlain by several impermeable units, and thus recharge to the aquifer is probably mainly by seepage down penetrative fracture systems. This purpose of this study was to develop a method to map the location of candidate deep penetrative...
Evaluation of wolf density estimation from radiotelemetry data
John W. Burch, Layne G. Adams, Erich H. Follmann, Eric A. Rexstad
2005, Wildlife Society Bulletin (33) 1225-1236
Density estimation of wolves (Canis lupus) requires a count of individuals and an estimate of the area those individuals inhabit. With radiomarked wolves, the count is straightforward but estimation of the area is more difficult and often given inadequate attention. The population area, based on the mosaic of pack territories,...
Use of relational databases to evaluate regional petroleum accumulation, groundwater flow, and CO2 sequestration in Kansas
T.R. Carr, D. F. Merriam, J.D. Bartley
2005, American Association of Petroleum Geologists Bulletin (89) 1607-1627
Large-scale relational databases and geographic information system tools are used to integrate temperature, pressure, and water geo-chemistry data from numerous wells to better understand regional-scale geothermal and hydrogeological regimes of the lower Paleozoic aquifer systems in the mid-continent and to evaluate their potential for geologic CO2 sequestration. The lower Paleozoic...
Mapping and improving frequency, accuracy, and interpretation of land cover change: Classifying coastal Louisiana with 1990, 1993, 1996, and 1999 Landsat Thematic Mapper image data
G. Nelson, Elijah W. Ramsey III, A. Rangoonwala
2005, Conference Paper, Proceedings of the Third International Workshop on the Analysis of Multi-Temporal Remote Sensing Images 2005
Landsat Thematic Mapper images and collateral data sources were used to classify the land cover of the Mermentau River Basin within the chenier coastal plain and the adjacent uplands of Louisiana, USA. Landcover classes followed that of the National Oceanic and Atmospheric Administration's Coastal Change Analysis Program; however, classification methods...
Site characterization in densely fractured dolomite: Comparison of methods
M. Muldoon, K. R. Bradbury
2005, Ground Water (43) 863-876
One of the challenges in characterizing fractured-rock aquifers is determining whether the equivalent porous medium approximation is valid at the problem scale. Detailed hydrogeologic characterization completed at a small study site in a densely fractured dolomite has yielded an extensive data set that was used to evaluate the utility of...
Assessing water source and channel type as factors affecting benthic macroinvertebrate and periphyton assemblages in the highly urbanized Santa Ana River Basin, California
Carmen A. Burton, Larry R. Brown, Kenneth Belitz
2005, American Fisheries Society Symposium (2005) 239-262
The Santa Ana River basin is the largest stream system in Southern California and includes a densely populated coastal area. Extensive urbanization has altered the geomorphology and hydrology of the streams, adversely affecting aquatic communities. We studied macroinvertebrate and periphyton assemblages in relation to two categorical features of the highly...
The evolution of fledging age in songbirds
D.A. Roff, V. Remes, T. E. Martin
2005, Journal of Evolutionary Biology (18) 1425-1433
In birds with altricial young an important stage in the life history is the age at fledging. In this paper we use an approach proven successful in the prediction of the optimal age at maturity in fish and reptiles to predict the optimal age of fledging in passerines. Integrating the...
Radiogenic 4He as a conservative tracer in buried‐valley aquifers
Stephen J. Van der Hoven, R. Erik Wright, David A. Carstens, Keith C. Hackley
2005, Water Resources Research (41)
The accumulation of 4He in groundwater can be a powerful tool in hydrogeologic investigations. However, the use of 4He often suffers from disagreement or uncertainty related to in situ and external sources of 4He. In situ sources are quantified by several methods, while external sources are often treated as calibration parameters in modeling....
Acute toxicity value extrapolation with fish and aquatic invertebrates
Denny R. Buckler, Foster L. Mayer, Mark R. Ellersieck, Amha Asfaw
2005, Archives of Environmental Contamination and Toxicology (49) 546-558
Assessment of risk posed by an environmental contaminant to an aquatic community requires estimation of both its magnitude of occurrence (exposure) and its ability to cause harm (effects). Our ability to estimate effects is often hindered by limited toxicological information. As a result, resource...
Use of XML and Java for collaborative petroleum reservoir modeling on the Internet
J. Victorine, W.L. Watney, S. Bhattacharya
2005, Computers & Geosciences (31) 1151-1164
The GEMINI (Geo-Engineering Modeling through INternet Informatics) is a public-domain, web-based freeware that is made up of an integrated suite of 14 Java-based software tools to accomplish on-line, real-time geologic and engineering reservoir modeling. GEMINI facilitates distant collaborations for small company and academic clients, negotiating analyses of both single and...
An efficient algorithm for double-difference tomography and location in heterogeneous media, with an application to the Kilauea volcano
V. Monteiller, J.-L. Got, J. Virieux, P. Okubo
2005, Journal of Geophysical Research B: Solid Earth (110) 1-22
Improving our understanding of crustal processes requires a better knowledge of the geometry and the position of geological bodies. In this study we have designed a method based upon double-difference relocation and tomography to image, as accurately as possible, a heterogeneous medium containing seismogenic objects. Our approach consisted not only...
An integrated environmental tracer approach to characterizing groundwater circulation in a mountain block
Andrew H. Manning, D. Kip Solomon
2005, Water Resources Research (41)
The subsurface transfer of water from a mountain block to an adjacent basin (mountain block recharge (MBR)) is a commonly invoked mechanism of recharge to intermountain basins. However, MBR estimates are highly uncertain. We present an approach to characterize bulk fluid circulation in a mountain block and thus MBR that...
Modeling and model validation of wind-driven circulation in Upper Klamath Lake, Oregon
R. T. Cheng, J. W. Gartner, T. Wood
2005, Conference Paper, World Water Congress 2005: Impacts of Global Climate Change - Proceedings of the 2005 World Water and Environmental Resources Congress
The hydrodynamics in the Upper Klamath Lake (UKL) plays a significant role in the water quality conditions of the lake. In order to provide a quantitative evaluation of the impacts of hydrodynamics on water quality in UKL, a detailed hydrodynamic model was implemented using an unstructured grid 3-D hydrodynamic model...
Steam injection pilot study in a contaminated fractured limestone (Maine, USA): Modeling and analysis of borehole radar reflection data
C. Gregoire, J.W. Lane Jr., P. K. Joesten
2005, Conference Paper, Proceedings of the 3rd International Workshop on Advanced Ground Penetrating Radar, IWAGPR 2005
Steam-enhanced remediation (SER) has been successfully used to remove DNAPL and LNAPL contaminants in porous media. Between August and November 2002, SER was tested in fractured limestone at the former Loring Air Force Base, in Maine, USA. During the SER investigation, the U.S. Geological Survey conducted a series of borehole...
Sexually dimorphic patterns of space use throughout ontogeny in the spotted hyena (Crocuta crocuta)
E. E. Boydston, K.M. Kapheim, R. C. Van Horn, L. Smale, K.E. Holekamp
2005, Journal of Zoology (267) 271-281
Observational and telemetry data were used in a geographic information system database to document the ontogenetic development of sexually dimorphic patterns of space use among free-living spotted hyenas Crocuta crocuta in Kenya. No measures of space use were sexually dimorphic among den-dwelling cubs, nor were sex differences apparent among hyenas...
Distribution and abundance of nonnative fishes in streams of the western United States
C.B. Schade, Scott A. Bonar
2005, North American Journal of Fisheries Management (25) 1386-1394
This report presents data from one of the largest standardized stream surveys conducted in he western United States, which shows that one of every four individual fish in streams of 12 western states are nonnative. The states surveyed included Arizona, California, Colorado, Idaho, Montana, Nevada, North Dakota, Oregon, South Dakota,...
Determinants of woody cover in African savannas
M. Sankaran, N.P. Hanan, Robert J. Scholes, J. Ratnam, D.J. Augustine, B.S. Cade, J. Gignoux, S.I. Higgins, Roux X. Le, F. Ludwig, J. Ardo, F. Banyikwa, A. Bronn, G. Bucini, K.K. Caylor, M.B. Coughenour, A. Diouf, W. Ekaya, C.J. Feral, E.C. February, P.G.H. Frost, P. Hiernaux, H. Hrabar, K.L. Metzger, H.H.T. Prins, S. Ringrose, W. Sea, J. Tews, J. Worden, N. Zambatis
2005, Nature (438) 846-849
Savannas are globally important ecosystems of great significance to human economies. In these biomes, which are characterized by the co-dominance of trees and grasses, woody cover is a chief determinant of ecosystem properties 1-3. The availability of resources (water, nutrients) and disturbance regimes (fire, herbivory) are thought to be important...
Landscape structure and plague occurrence in black-tailed prairie dogs on grasslands of the western USA
S.K. Collinge, W.C. Johnson, C. Ray, R. Matchett, J. Grensten, J.F. Cully Jr., K.L. Gage, M.Y. Kosoy, J.E. Loye, A.P. Martin
2005, Landscape Ecology (20) 941-955
Landscape structure influences the abundance and distribution of many species, including pathogens that cause infectious diseases. Black-tailed prairie dogs in the western USA have declined precipitously over the past 100 years, most recently due to grassland conversion and their susceptibility to sylvatic plague. We assembled and analyzed two long-term data...
Can we estimate total magnetization directions from aeromagnetic data using Helbig's integrals?
Jeffrey Phillips
2005, Earth, Planets and Space (57) 681-689
An algorithm that implements Helbig’s (1963) integrals for estimating the vector components (mx, my, mz) of the magnetic dipole moment from the first order moments of the vector magnetic field components (ΔX, ΔY, ΔZ) is tested on real and synthetic data. After a grid of total field aeromagnetic data is converted to...
Phylogeographic patterns of Hawaiian Megalagrion damselflies (Odonata: Coenagrionidae) correlate with Pleistocene island boundaries
Stephen A. Jordan, C. Simon, D. Foote, R.A. Englund
2005, Molecular Ecology (14) 3457-3470
The Pleistocene geological history of the Hawaiian Islands is becoming well understood. Numerous predictions about the influence of this history on the genetic diversity of Hawaiian organisms have been made, including the idea that changing sea levels would lead to the genetic differentiation of populations isolated on individual volcanoes during...
The Ames MER microscopic imager toolkit
R. Sargent, Matthew Deans, C. Kunz, M. Sims, K. Herkenhoff
2005, Conference Paper, IEEE Aerospace Conference Proceedings
12The Mars Exploration Rovers, Spirit and Opportunity, have spent several successful months on Mars, returning gigabytes of images and spectral data to scientists on Earth. One of the instruments on the MER rovers, the Athena Microscopic Imager (MI), is a fixed focus, megapixel camera providing a ??3mm depth of field...
Delineating priority habitat areas for the conservation of Andean bears in northern Ecuador
M.F. Peralvo, F. Cuesta, F. Van Manen
2005, Ursus (16) 222-233
We sought to identify priority areas for the conservation of Andean bear (Tremarctos ornatus) habitat in the northern portion of the eastern Andean cordillera in Ecuador. The study area included pa??ramo and montane forest habitats within the Antisana and Cayambe-Coca ecological reserves, and unprotected areas north of these reserves with...
Assessing background ground water chemistry beneath a new unsewered subdivision
J.D. Wilcox, K. R. Bradbury, C. L. Thomas, J.M. Bahr
2005, Ground Water (43) 787-795
Previous site-specific studies designed to assess the impacts of unsewered subdivisions on ground water quality have relied on upgradient monitoring wells or very limited background data to characterize conditions prior to development. In this study, an extensive monitoring program was designed to document ground water conditions prior to construction of...
Repeated surveys by acoustic Doppler current profiler for flow and sediment dynamics in a tidal river
R.L. Dinehart, J.R. Burau
2005, Journal of Hydrology (314) 1-21
A strategy of repeated surveys by acoustic Doppler current profiler (ADCP) was applied in a tidal river to map velocity vectors and suspended-sediment indicators. The Sacramento River at the junction with the Delta Cross Channel at Walnut Grove, California, was surveyed over several tidal cycles in the Fall of 2000...
Coastal foredune displacement and recovery, Barrett Beach-Talisman, Fire Island, New York, USA
N.P. Psuty, J.P. Pace, J.R. Allen
2005, Zeitschrift fur Geomorphologie, Supplementband (141) 153-168
Coastal foredune mobility has been tracked at Fire Island National Seashore since 1976 with annual field surveys and analysis of frequent aerial photography. Sequential mapping of the foredune crestline depicts nearly islandwide displacement during major storm events, such as in 1992, and localized displacement during alongshore passage of inshore circulation...
