Capture zones for simple aquifers
Carl D. McElwee
1991, Ground Water (29) 587-590
Abstract. The protection and cleanup of aquifers is a matter of high priority for all states and the federal government. One concept that is receiving increased attention is that of wellhead protection. Capture zones showing the area influenced by a well within a certain time are...
The transition from hydrostatic to greater than hydrostatic fluid pressure in presently active continental hydrothermal systems in crystalline rock
R.O. Fournier
1991, Geophysical Research Letters (18) 955-958
Fluid flow at hydrostatic pressure (Ph) is relatively common through fractures in silicic and in mafic crystalline rocks where temperatures are less than about 350–370°C. In contrast, pore-fluid pressure (Pf) > Ph has been encountered at the bottom of 3 geothermal exploration wells that attained temperatures >370°C...
Leaching of 226Ra from components of uranium mill tailings
E. R. Landa
1991, Hydrometallurgy (26) 361-368
A sequential extraction procedure was used to characterize the geochemical forms of 226Ra retained by mixtures of quartz sand and a variety of fine-grained rock and mineral species. These mixtures had previously been exposed to the sulfuric acid milling liquor of a simulated acid-leach uranium milling circuit. For most test cases,...
Fractal analysis of multiscale spatial autocorrelation among point data
L. De Cola
1991, Environment and Planning A (23) 545-556
The analysis of spatial autocorrelation among point-data quadrats is a well-developed technique that has made limited but intriguing use of the multiscale aspects of pattern. In this paper are presented theoretical and algorithmic approaches to the analysis of aggregations of quadrats at or above a given density, in which these...
Relation between the national handbook of recommended methods for water data acquisition and ASTM standards
G. Douglas Glysson, John V. Skinner
1991, Conference Paper, ASTM Special Technical Publication
In the late 1950's, intense demands for water and growing concerns about declines in the quality of water generated the need for more water-resources data. About thirty Federal agencies, hundreds of State, county and local agencies, and many private organizations had been collecting water data. However, because of differences in...
Metabolism and elimination of benzocaine by rainbow-trout, Oncorhynchus mykiss
J.R. Meinertz, W.H. Gingerich, J. L. Allen
1991, Xenobiotica (21) 525-533
1. Branchial and urinary elimination of benzocaine residues was evaluated in adult rainbow trout, oncorhynchus mykiss, given a single dorsal aortic dose of c-14-benzocaine hydrochloride.^2. Branchial elimination of benzocaine residues was rapid and accounted for 59.2% Of the dose during the first 3 h after dosing. Renal...
Brood stock segregation of spring chinook salmon Oncorhynchus tshawytscha by use of the enzyme-linked immunosorbent assay (ELISA) and the fluorescent antibody technique (FAT) affects the prevalence and levels of Renibacterium salmoninarum infection in progeny
Ronald J. Pascho, Diane G. Elliott, Jonathan M. Streufert
1991, Diseases of Aquatic Organisms (12) 25-40
A study of the effect of maternal Renibacterium salmoninarum infection levels on the prevalence and levels of bacterial kidney disease (BKD) in progeny fish was conducted at a production salmon hatchery. A total of 302 mating pairs of spring chinook salmon Oncorhynchus tshawytscha was screened in August 1988 for R....
Uncertainty in climate change and drought
Gregory J. McCabe, David M. Wolock, Gary D. Tasker, Mark A. Ayers
Shane Richard M., editor(s)
1991, Conference Paper, Proceedings - National Conference on Hydraulic Engineering
A series of projections of climate change were applied to a watershed model of the Delaware River basin to identify sources of uncertainty in predicting effects of climate change on drought in the basin as defined by New York City reservoir contents. The watershed model is a calibrated, monthly time-step...
A new approach to plane-sweep overlay: topological structuring and line-segment classification
Jan W. van Roessel
1991, Cartography and Geographic Information Systems (18) 49-67
An integrated approach to spatial overlay was developed with the objective of creating a single function that can perform most of the tasks now assigned to discrete functions in current systems. Two important components of this system are a unique method for topological structuring, and a method for attribute propagation...
Late quaternary geologic framework, north-central Gulf of Mexico
Jack L. Kindinger, Shea Penland, S. Jeffress Williams, Gregg R. Brooks, John R. Suter, Randolph A. McBride
1991, Conference Paper, Coastal Sediments '91
The geologic framework of the north-central Gulf of Mexico shelf is composed of multiple, stacked, delta systems. Shelf and nearshore sedimentary facies were deposited by deltaic progradation, followed by shoreface erosion and submergence. A variety of sedimentary facies has been identified, including prodelta, delta fringe, distributary, lagoonal, barrier island, and...
Anomalous folds associated with the east-central part of the Garlock Fault, southeast California
G.I. Smith
1991, Geological Society of America Bulletin (103) 615-624
The east-central part of the left-lateral Garlock fault, in southeast California, is associated with three broad folds that trend and plunge northeast. The folds, which lie north, south, and astride the fault, postdate deposition of alluvial gravels that at one time formed a continuous northwest-sloping fan; the gravels rest conformably...
The effects of noise due to random undetected tilts and paleosecular variation on regional paleomagnetic directions
G.J. Calderone, R.F. Butler
1991, Journal of Geophysical Research (96) 3973-3977
Random tilting of a single paleomagnetic vector produces a distribution of vectors which is not rotationally symmetric about the original vector and therefore not Fisherian. Monte Carlo simulations were performed on two types of vector distributions: (1) distributions of vectors formed by perturbing a single...
Assessing the effects of microbial metabolism and metabolities on reservoir pore structure
E.O. Udegbunam, J.P. Adkins, R.M. Knapp, M.J. McInerney, R.S. Tanner
1991, Conference Paper, Proceedings - SPE Annual Technical Conference and Exhibition
The effect of microbial treatment on pore structure of sandstone and carbonatereservoirs was determined. Understanding how different bacterial strains and their metabolic bioproducts affect reservoir pore structure will permit the prudent application of microorganisms for enhanced oil recovery. The microbial strains tested included Clostridium acetobutylicum, a polymer-producing Bacillus strain, and...
Late Quaternary faulting along the Death Valley-Furnace Creek fault system, California and Nevada
George E. Brogan, Karl S. Kellogg, D. Burton Slemmons, Christina L. Terhune
1991, Bulletin 1991
The Death Valley-Furnace Creek fault system, in California and Nevada, has a variety of impressive late Quaternary neotectonic features that record a long history of recurrent earthquake-induced faulting. Although no neotectonic features of unequivocal historical age are known, paleoseismic features from multiple late Quaternary events of surface faulting are well...
ReOs isotope systematics of NiCu sulfide ores, Sudbury Igneous Complex, Ontario: Evidence for a major crustal component
R.J. Walker, J. W. Morgan, A.J. Naldrett, C. Li, J.D. Fassett
1991, Earth and Planetary Science Letters (105) 416-429
Sudbury Igneous Complex sublayer ores from the Levack West, Falconbridge and Strathcona mines were analyzed for their Re and Os concentrations and Os isotopic compositions. The Re-Os isotope systematics of three ores from the different mines give isochron ages of1 840...
Quantitative controls on submarine slope failure morphology
H.J. Lee, W. C. Schwab, B. D. Edwards, R. E. Kayen
1991, Marine Geotechnology (10) 143-157
The concept of the steady-state of deformation can be applied to predicting the ultimate form a landslide will take. The steady-state condition, defined by a line in void ratio-effective stress space, exists at large levels of strain and remolding. Conceptually, if sediment initially exists with void ratio-effective stress conditions above...
Effect of channelization of Rio Puerto Nuevo on ground-water levels in the San Juan metropolitan area, Puerto Rico
Ingrid Padilla
1991, Conference Paper
Channelization and concrete lining of the Rio Puerto Nuevo and its tributaries in the San Juan Metropolitan area has been proposed to control flooding in low lying areas adjacent to the stream. Concern about the effect of these channel modifications on the ground-water system prompted the U.S. Geological Survey in...
Physiography, surficial sediments and Quaternary stratigraphy of the inner continental shelf and nearshore region of the Gulf of Maine
J. T. Kelley, D. F. Belknap
1991, Continental Shelf Research (11) 1265-1283
The western margin of the Gulf of Maine is a bedrock-framed, glaciated continental shelf that has only recently been geologically mapped. The bathymetry is divisible into four physiographic areas: nearshore basins, shelf valleys, rocky zones, and outer basins. The nearshore basins are largely floored by mud except near rock outcrops...
Geophysical borehole logging in the unsaturated zone, Yucca Mountain, Nevada
Ulrich Schimschal, Philip H. Nelson
Anon, editor(s)
1991, Conference Paper, High Level Radioactive Waste Management
Borehole geophysical logging for site characterization in the volcanic rocks at the proposed nuclear waste repository at Yucca Mountain, Nevada, requires data collection under rather unusual conditions. Logging tools must operate in rugose, dry holes above the water table in the unsaturated zone. Not all logging tools will operate in...
Is April to July runoff really decreasing in the Western United States?
Kenneth L. Wahl
1991, Conference Paper, Proceedings of The Western Snow Conference
Global warming has been the topic of a great deal of heated discussion and debate in recent years, both in the lay press and in scientific journals. The debate is about whether we are beginning to detect signs of a buildup of greenhouse gases on a global scale. A major...
Hatchery efficacy trials with chloramine-T for control of bacterial kidney disease
G. L. Bullock, R. L. Herman, C. Waggy
1991, Journal of Aquatic Animal Health (3) 48-50
Three hatchery trials were carried out to determine the efficacy of chloramine-T for the control of bacterial gill disease in rainbow trout Oncorhynchus mykiss, ranging in weight from 2.5 to 54 g. In each trial, we used a single flow-through treatment of 8.5 mg chloramine-T/L. The single...
Evaluation of evidence pertaining to the origin of vein deposits exposed in trench 14, Nevada Test Site, Nevada
J. S. Stuckless
Anon, editor(s)
1991, Conference Paper, High Level Radioactive Waste Management
Large vein-like deposits of calcite and opaline silica that infill the Bow Ridge fault are exposed by Trench 14 at the Nevada Test Site. The origin of the deposits has been the center of considerable controversy because the deposits occur on the edge of Yucca Mountain, which is being characterized...
Moment-tensor solutions estimated using optimal filter theory: global seismicity, 1988-1989
S.A. Sipkin, R.E. Needham
1991, Physics of the Earth and Planetary Interiors (67) 221-230
Moment-tensor solutions, estimated using optimal filter theory, are listed for 201 moderate-to-large earthquakes occurring from 1988 to 1989. ?? 1991....
Response to comment by W.A. Myers and P.K. Kuroda on "Actinide abundances in ordinary chondrites"
B. Hagee, T.J. Bernatowicz, F.A. Podosek, M.L. Johnson, D.S. Burnett, M. Tatsumoto
1991, Geochimica et Cosmochimica Acta (55) 2359-2363
No abstract available....
The late Cenozoic diatom stratigraphy and paleolimnology of Tule Lake, Siskiyou Co. California
J.P. Bradbury
1991, Journal of Paleolimnology (6) 205-255
Lacustrine diatoms are diverse, well preserved and abundant in cores of lake sediment to 334 m depth near the town of Tulelake, Siskiyou County, northern California. The cores have been dated by radiometric, tephrochronologic and paleomagnetic techniques, which indicate a basal age of about 3 million years (Ma) and a...
