Experimental evaluation of factors affecting temporal variability of water samples obtained from long-screened wells
T. E. Reilly, D.R. LeBlanc
1998, Ground Water (36) 566-576
As a well is pumped through time, concentrations of specific constituents in the water discharging from the well may change as a result of their transport within the well and the aquifer. A series of experiments conducted at a research site on Cape Cod, Massachusetts, examined the effects of transport...
Regionalization of precipitation characteristics in Montana using L-moments
C. Parrett
1998, Transportation Research Record (1647) 43-52
Dimensionless precipitation-frequency curves for estimating precipitation depths having small exceedance probabilities were developed for 2-, 6-, and 24-hour storm durations for three homogeneous regions in Montana. L-moment statistics were used to help define the homogeneous regions. The generalized extreme value distribution was used to construct the frequency curves for each duration...
Coalbed methane resource potential and current prospects in Pennsylvania
A.K. Markowski
1998, International Journal of Coal Geology (38) 137-159
Coalbed methane gas content analyses from exploratory coal cores and existing data indicate that gas content generally increases with increasing depth and rank. The coal beds studied are from the Main Bituminous field of Pennsylvania (which currently contains 24 coalbed methane pools) and the Northern and Southern Anthracite coal fields....
Petrofacies Analysis - A Petrophysical Tool for Geologic/Engineering Reservoir Characterization
W.L. Watney, W. J. Guy, J.H. Doveton, S. Bhattacharya, P.M. Gerlach, Geoffrey C. Bohling, T.R. Carr
1998, AAPG Memoir 73-90
Petrofacies analysis is defined as the characterization and classification of pore types and fluid saturations as revealed by petrophysical measurements of a reservoir. The word "petrofacies" makes an explicit link between petroleum engineers' concerns with pore characteristics as arbiters of production performance and the facies paradigm of geologists as a...
Determination of phylogenetic relationships of Flavobacterinium psychrophilum (Flexibacterin psychrophilus), Flavobacterinium columnare (Flexibacterin columnaris), and Flexibacterin maritimus by sequence analysis of 16S ribosomal RNA genes amplified by polymerase chain reaction
J.A. Bader, E. B. Shotts Jr.
1998, Journal of Aquatic Animal Health (10) 320-327
The nearly complete small subunit 16S ribosomal RNA (rRNA) gene sequence amplified by polymerase chain reaction was determined for Flavobacterium psychrophilum (formerly Flexibacter psychrophilus) by using automated nucleotide sequencing. The sequence was found to be 1,465 base pairs (bp) in length, a size consistent with previously determined sequences for...
Hawaii bibliographic database
T. L. Wright, T.J. Takahashi
1998, Bulletin of Volcanology (59) 276-280
The Hawaii bibliographic database has been created to contain all of the literature, from 1779 to the present, pertinent to the volcanological history of the Hawaiian-Emperor volcanic chain. References are entered in a PC- and Macintosh-compatible EndNote Plus bibliographic database with keywords and abstracts or (if no abstract) with annotations...
Erosional valleys in the Thaumasia region of Mars: Hydrothermal and seismic origins
K. L. Tanaka, J. M. Dohm, J.H. Lias, T.M. Hare
1998, Journal of Geophysical Research E: Planets (103) 31407-31419
Analysis of erosional valleys, geologic materials and features, and topography through time in the Thaumasia region of Mars using co-registered digital spatial data sets reveals significant associations that relate to valley origin. Valleys tend to originate (1) on Noachian to Early Hesperian (stages 1 and 2) large volcanoes, (2) within...
Quantitative measure of the variation in fault rheology due to fluid-rock interactions
M.L. Blanpied, C.J. Marone, D.A. Lockner, J.D. Byerlee, D.P. King
1998, Journal of Geophysical Research B: Solid Earth (103) 9691-9712
We analyze friction data from two published suites of laboratory tests on granite in order to explore and quantify the effects of temperature (T) and pore water pressure (Pp) on the sliding behavior of faults. Rate-stepping sliding tests were performed on laboratory faults in granite containing “gouge” (granite powder), both...
Predicting CH4 adsorption capacity of microporous carbon using N2 isotherm and a new analytical model
Jielun Sun, S. Chen, M. Rostam-Abadi, M.J. Rood
1998, ACS Division of Fuel Chemistry, Preprints (43) 596-599
A new analytical pore size distribution (PSD) model was developed to predict CH4 adsorption (storage) capacity of microporous adsorbent carbon. The model is based on a 3-D adsorption isotherm equation, derived from statistical mechanical principles. Least squares error minimization is used to solve the PSD without any pre-assumed distribution function....
Radio-tracking manatees from land and space: tag design, implementation, and lessons learned from long-term study
C. J. Deutsch, R. K. Bonde, J.P. Reid
1998, Marine Technology Society Journal (32) 18-29
West Indian manatees (Trichechus manatus) were tracked along the Atlantic coast of Florida and Georgia (N = 83 manatees, n = 439 tag deployments, 1986-1996) and in eastern Puerto Rico (N = 8, n = 43, 1992-1996) using conventional and satellite-based radio-telemetry systems. A floating radio-tag, attached by a flexible...
Occurrence of pesticides in shallow groundwater of the United States: initial results from the National Water-Quality Assessment program
Dana W. Kolpin, Jack E. Barbash, Robert J. Gilliom
1998, Environmental Science & Technology (32) 558-566
The first phase of intensive data collection for the National Water-Quality Assessment (NAWQA) was completed during 1993−1995 in 20 major hydrologic basins of the United States. Groundwater land-use studies, designed to sample recently recharged groundwater (generally within 10 years) beneath specific land-use and hydrogeologic settings, are a major component of...
Re-Os ages for Archean molybdenite and pyrite, Kuittila-Kivisuo, Finland and Proterozoic molybdenite, Kabeliai, Lithuania: Testing the chronometer in a metamorphic and metasomatic setting
H. J. Stein, K. Sundblad, R.J. Markey, J. W. Morgan, G. Motuza
1998, Mineralium Deposita (33) 329-345
Seven 187Re-187Os ages were determined for molybdenite and pyrite samples from two well-dated Precambrian intrusions in Fennoscandia to examine the sustainability of the Re-Os chronometer in a metamorphic and metasomatic setting. Using a new 187Re decay constant (1.666 x 10-11y-1) with a much improved uncertainty (±0.31%), we determined replicate Re-Os...
Changes in land use as a possible factor in Mourning Dove population decline in Central Utah
William D. Ostrand, P.M. Meyers, J.A. Bissonette, M. R. Conover
1998, Journal of Field Ornithology (69) 192-200
Mourning Dove (Zenaida macroura) population indices for the western United States have declined significantly since 1966. Based on data collected in 1951-1952, in Fillmore, Utah, we examined whether there had been a local decline in the dove population index since the original data were collected. We then determined whether habitat...
An empirical model of the tidal currents in the Gulf of the Farallones
J.M. Steger, C. A. Collins, F.B. Schwing, M. Noble, N. Garfield, M.T. Steiner
1998, Deep-Sea Research Part II: Topical Studies in Oceanography (45) 1471-1505
Candela et al. (1990, 1992) showed that tides in an open ocean region can be resolved using velocity data from a ship-mounted ADCP. We use their method to build a spatially varying model of the tidal currents in the Gulf of the Farallones, an area of complicated bathymetry where the...
Pathology of diseases in wild desert tortoises from California
B.L. Homer, K.H. Berry, Mary E. Brown, G. Ellis, E.R. Jacobson
1998, Journal of Wildlife Diseases (34) 508-523
Twenty-four ill or dead desert tortoises (Gopherus agassizii) were received between March 1992 and July 1995 for necropsies from the Mojave and Colorado deserts of California (USA). Diseases observed in these animals included cutaneous dyskeratosis (n = 7); shell necrosis (n = 2); respiratory diseases...
The National Water Data Exchange-capabilities and trends in the dissemination and exchange of water data
J.S. Burton
1998, IAHS-AISH Publication 237-248
This paper discusses the programmes of the National Water Data Exchange (NAWDEX) in providing access to US Geological Survey (USGS) water data and water-related information. NAWDEX dissseminates water data and water-related information by working cooperatively through a network of 68 Assistance Centers to more than 430 member organizations. In addition,...
Landscape modeling for Everglades ecosystem restoration
D.L. DeAngelis, L.J. Gross, M.A. Huston, W.F. Wolff, D. M. Fleming, E.J. Comiskey, S.M. Sylvester
1998, Ecosystems (1) 64-75
A major environmental restoration effort is under way that will affect the Everglades and its neighboring ecosystems in southern Florida. Ecosystem and population-level modeling is being used to help in the planning and evaluation of this restoration. The specific objective of one of these modeling approaches, the Across Trophic Level...
Flow of river water into a Karstic limestone aquifer. 1. Tracing the young fraction in groundwater mixtures in the Upper Floridan Aquifer near Valdosta, Georgia
Niel Plummer, E. Busenberg, J. B. McConnell, S. Drenkard, P. Schlosser, R. L. Michel
1998, Applied Geochemistry (13) 995-1015
The quality of water in the Upper Floridan aquifer near Valdosta, Georgia is affected locally by discharge of Withlacoochee River water through sinkholes in the river bed. Data on transient tracers and other dissolved substances, including Cl−, 3H, tritiogenic helium-3 (3He), chlorofluorocarbons (CFC-11, CFC-12,...
Measurement of stream channel habitat using sonar
Marshall Flug, Heather Seitz, John Scott
1998, Regulated Rivers: Research & Management (14) 511-517
An efficient and low cost technique using a sonar system was evaluated for describing channel geometry and quantifying inundated area in a large river. The boat-mounted portable sonar equipment was used to record water depths and river width measurements for direct storage on a laptop computer. The field data collected...
Geodynamics of magmatic Cu-Ni-PGE sulfide deposits: New insights from the Re-Os isotope system
D.D. Lambert, J.G. Foster, L.R. Frick, E.M. Ripley, M. L. Zientek
1998, Economic Geology (93) 121-136
In this study, we reassess crustal contamination and sulfide ore-forming processes in some of the largest magmatic ore deposits, using published Re-Os isotope data and a modeling methodology that incorporates the R factor, defined as the effective mass of silicate magma with which a given mass of sulfide magma has...
Poroelastic rebound along the Landers 1992 earthquake surface rupture
G. Peltzer, P. Rosen, F. Rogez, K. Hudnut
1998, Journal of Geophysical Research B: Solid Earth (103) 30131-30145
Maps of surface displacement following the 1992 Landers, California, earthquake, generated by interferometric processing of ERS-1 synthetic aperture radar (SAR) images, reveal effects of various postseismic deformation processes along the 1992 surface rupture. The large-scale pattern of the postseismic displacement field includes large lobes, mostly visible on the west side...
A female black bear denning habitat model using a geographic information system
J. D. Clark, S.G. Hayes, J.M. Pledger
1998, Ursus (10) 181-185
We used the Mahalanobis distance statistic and a raster geographic information system (GIS) to model potential black bear (Ursus americanus) denning habitat in the Ouachita Mountains of Arkansas. The Mahalanobis distance statistic was used to represent the standard squared distance between sample variates in the GIS database (forest cover type,...
Effects of management practices on grassland birds: Henslow's sparrow
James R. Herkert
1998, Report
Information on the habitat requirements and effects of habitat management on grassland birds were summarized from information in more than 4,000 published and unpublished papers. A range map is provided to indicate the relative densities of the species in North America, based on Breeding Bird Survey (BBS) data. Although birds...
First-generation site-response maps for the Los Angeles region based on earthquake ground motions
S. Hartzell, S. Harmsen, A. Frankel, D. Carver, E. Cranswick, M. Meremonte, J. Michael
1998, Bulletin of the Seismological Society of America (88) 463-472
Ground-motion records from aftershocks of the 1994 Northridge earthquake and mainshock records from the 1971 San Fernando, 1987 Whittier Narrows, 1991 Sierra Madre, and 1994 Northridge earthquakes are used to estimate site response relative to a rock site for the urban Los Angeles...
Effects of management practices of grassland birds: Savannah Sparrow
David A. Swanson
1998, Report
Information on the habitat requirements and effects of habitat management on grassland birds were summarized from information in more than 4,000 published and unpublished papers. A range map is provided to indicate the relative densities of the species in North America, based on Breeding Bird Survey (BBS) data. Although birds...
