Improved apparatus for measuring hydraulic conductivity at low water content
J. R. Nimmo, K.C. Akstin, K.A. Mello
1992, Soil Science Society of America Journal (56) 1758-1761
A modification of the steady-state centrifuge method (SSCM) for unsaturated hydraulic conductivity (K) measurement improves the range and adjustability of this method. The modified apparatus allows mechanical adjustments to vary the measured K by a factor of 360. In addition, the use of different flow-regulating ceramic materials can give a total K range covering...
Ground-water recharge through active sand dunes in northwestern Nevada
D.L. Berger
1992, Water Resources Bulletin (28) 959-965
Most water-resource investigations in semiarid basins of the Great Basin in western North America conclude that ground-water recharge from direct precipitation on the valley floor is negligible. However, many of these basins contain large areas covered by unvegetated, active sand dunes that may act as conduits for ground-water recharge. The...
Growth models and food conversion of cultured juvenile red abalone (Haliotis rufescens)
J.L. Greenier, John Y. Takekawa
S.A. Shepherd, M. J. Tegner, S. A. Guzman del Proo, editor(s)
1992, Book chapter, Abalone of the world
No abstract available at this time...
Lower Cretaceous smarl turbidites of the Argo Abyssal Plain, Indian Ocean
Julie A. Dumoulin
Sondra K. Stewart, Diana Kennett, Elsa K. Mazzullo, editor(s)
1992, Proceedings of the Ocean Drilling Program: Scientific Results 123-5
Sediments recovered during Ocean Drilling Program (ODP) Leg 123 from the Argo Abyssal Plain (AAP) consist largely of turbidites derived from the adjacent Australian continental margin. The oldest abundant turbidites are Valanginian-Aptian in age and have a mixed (smarl) composition; they contain subequal amounts of calcareous and siliceous biogenic components,...
Insulin-like growth factors "under water": role in growth and function of fish and other poikilothermic vertebrates
H. A. Bern, S. D. McCormick, K.M. Kelley, E.S. Gray, R. S. Nishioka, Steffen S. Madsen, P.I. Tsai
E.M. Spencer, editor(s)
1992, Book chapter, Modern Concepts of Insulin-like Growth Factors
No abstract available at this time...
Water quality changes and their relation to fishery resources in the upper Mississippi River
L. E. Holland Bartels
C.D. Becker, D.A. Neitzel, editor(s)
1992, Book chapter, Water quality in North American river systems
Despite a long history of human manipulation, the most dramatic changes in the upper Mississippi River occurred in the 1930s with construction of a lock and dam system to facilitate the commercial transport of commodities. In 1988, barge traffic through the system ranged from 7,500 tows per year at Lock...
A semi-implicit finite difference model for three-dimensional tidal circulation,
V. Casulli, R. T. Cheng
1992, Conference Paper
A semi-implicit finite difference formulation for the numerical solution of three-dimensional tidal circulation is presented. The governing equations are the three-dimensional Reynolds equations in which the pressure is assumed to be hydrostatic. A minimal degree of implicitness has been introduced in the finite difference formula so that in the absence...
Application of a computer simulation model to migrating white-fronted geese in the Klamath Basin
R.B. Frederick, William R. Clark, John Y. Takekawa
Dale R. McCullough, R.H. Barrett, editor(s)
1992, Book chapter, Wildlife 2001: Populations
The Pacific greater white-fronted goose (Anser albifrons) population has declined precipitously over the past 20 years. Loss of wetland habitat in California wintering areas has had a significant effect on the population, so recovery of the population may depend on innovative management of the few remaining wetlands. A computer simulation...
The October 1992 Parkfield, California, earthquake prediction
J. Langbein
1992, Earthquakes & Volcanoes (USGS) (23) 160-169
A magnitude 4.7 earthquake occurred near Parkfield, California, on October 20, 992, at 05:28 UTC (October 19 at 10:28 p.m. local or Pacific Daylight Time).This moderate shock, interpreted as the potential foreshock of a damaging earthquake on the San Andreas fault, triggered long-standing federal, state and local government plans to...
Sensitivity of ground - water recharge estimates to climate variability and change, Columbia Plateau, Washington
John J. Vaccaro
1992, Journal of Geophysical Research D: Atmospheres (97) 2821-2833
The sensitivity of groundwater recharge estimates was investigated for the semiarid Ellensburg basin, located on the Columbia Plateau, Washington, to historic and projected climatic regimes. Recharge was estimated for predevelopment and current (1980s) land use conditions using a daily energy-soil-water balance model. A synthetic daily weather generator was used to...
Data set for verification of 3-D free-surface hydrodynamic models, Carquinez Strait, California
P. E. Smith, R.N. Oltmann, M.R. Simpson
1992, Conference Paper, Proceedings of the Hydraulic Engineering Sessions Water Forum 1992
No abstract available....
Fault stability under conditions of variable normal stress
James H. Dieterich, Mark F. Linker
1992, Geophysical Research Letters (19) 1691-1694
The stability of fault slip under conditions of varying normal stress is modeled as a spring and slider system with rate- and state-dependent friction. Coupling of normal stress to shear stress is achieved by inclining the spring at an angle, ø, to the sliding surface. Linear...
Decomposition techniques
T. T. Chao, R. F. Sanzolone
1992, Journal of Geochemical Exploration (44) 65-106
Sample decomposition is a fundamental and integral step in the procedure of geochemical analysis. It is often the limiting factor to sample throughput, especially with the recent application of the fast and modern multi-element measurement instrumentation. The complexity of geological materials...
Tale of three prospects
Wendell A. Duffield
Anon, editor(s)
1992, Conference Paper, Transactions - Geothermal Resources Council
Most high-temperature, hydrothermal-convection systems probably are heated by bodies of magma (and/or hot plutons), whose presence is suggested by geologically young, if not active volcanism. Study of a young volcanic area provides information about the general thermal status of the underlying heat source, and detailed information about the time-space-volume-composition (TSVC)...
Change-in-ratio methods for estimating population size
Mark S. Udevitz, Kenneth H. Pollock
Dale R. McCullough, Reginald H. Barrett, editor(s)
1992, Book chapter, Wildlife 2001: Populations
Change-in-ratio (CIR) methods can provide an effective, low cost approach for estimating the size of wildlife populations. They rely on being able to observe changes in proportions of population subclasses that result from the removal of a known number of individuals from the population. These methods were first introduced in...
Chemical regulation of spawning in the zebra mussel (Dreissena polymorpha)
Jeffrey L. Ram, S. Jerrine Nichols
Thomas F. Nalepa, Donald W. Schloesser, editor(s)
1992, Book chapter, Zebra mussels: Biology, impacts, and control
Previous literature suggests that spawning in bivalves is chemically regulated, both by environmental chemical cues and by internal chemical mediators. In a model proposed for zebra mussels, chemicals from phytoplankton initially trigger spawning, and chemicals associated with gametes provide further stimulus for spawning. The response to environmental chemicals...
Debris flow rheology: Experimental analysis of fine-grained slurries
Jon J. Major, Thomas C. Pierson
1992, Water Resources Research (28) 841-857
The rheology of slurries consisting of ≤2-mm sediment from a natural debris flow deposit was measured using a wide-gap concentric-cylinder viscometer. The influence of sediment concentration and size and distribution of grains on the bulk rheological behavior of the slurries was evaluated at concentrations ranging from 0.44 to 0.66. The...
Threshold foraging behavior of baleen whales
John F. Piatt, David A. Methven
1992, Marine Ecology Progress Series (84) 210
We conducted hydroacoustic surveys for capelin Mallotus villosus in Witless Bay, Newfoundland, Canada, on 61 days during the summers of 1983 to 1985. On 32 of those days in whlch capelin surveys were conducted, we observed a total of 129 baleen whales - Including 93 humpback Megaptera novaeangliae, 31 minke...
Data integration through region-based nominal filtering
Eugene A. Fosnight
1992, International Journal of Geographical Information Systems (6) 469-478
Resource models integrating disparate nominal or class grid-cell data can be implemented by using spatial filters. Most modelling procedures do not adequately handle noise created during the process of merging and integrating multiple grid-cell data sets. Data integration can be best accomplished in an environment where ready access to statistical...
Reply to comment by G. de Marsily, P. Combes, and P. Goblet on "Ground-water models cannot be validated"
J.D. Bredehoeft, Leonard F. Konikow
1992, Advances in Water Resources (15) 371-372
No abstract available....
Evaluation of terrain models for the geocoding and terrain correction, of synthetic aperture radar (SAR) images
C. E. Wivell, Daniel R. Steinwand, G. G. Kelly, D. J. Meyer
1992, IEEE Transactions on Geoscience and Remote Sensing (30) 1137-1144
The variability of the resolutions and the presence of artifacts cause inaccurate correction of the terrain-induced geometric distortions in synthetic-aperture radar (SAR) images. To quantify the effects of these inaccuracies on SAR terrain correction, corrections of a Seasat SAR image were performed using a 1 degrees US Geological Survey (USGS)...
Land cover mapping of the Upper Kuskokwim Resource Management Area, Alaska, using Landsat and a digital data base approach
Carl Markon
1992, Canadian Journal of Remote Sensing (18) 62-71
Digital land cover and terrain data for the Upper Kuskokwim Resource Management Area in south-central Alaska were produced by the U.S. Geological Survey for the U.S. Bureau of Land Management. These and other environmental data were incorporated into a digital data base to assist in the production of a land...
Geochemical heterogeneity in a sand and gravel aquifer: Effect of sediment mineralogy and particle size on the sorption of chlorobenzenes
Larry B. Barber II, E. Michael Thurman, Donald D. Runnells
1992, Journal of Contaminant Hydrology (9) 35-54
The effect of particle size, mineralogy and sediment organic carbon (SOC) on sorption of tetrachlorobenzene and pentachlorobenzene was evaluated using batch-isotherm experiments on sediment particle-size and mineralogical fractions from a sand and gravel aquifer, Cape Cod, Massachusetts. Concentration of SOC and sorption of chlorobenzenes increase with decreasing particle size. For...
Combining remote sensing techniques with simulation modelling for assessing rangeland resources
J. D. Hanson, G.L. Anderson, R. H. Haas
1992, Geocarto International (7) 99-104
Simulation modelling and remote sensing techniques can be used to describe ecological processes. When used together, these tools can increase our understanding of the spatial variability of ecosystems. Remotely sensed data can be combined with simulation models for predicting the accumulation of plant biomass, as surrogate variables within the models,...
Functional response and capture timing in an individual-based model: predation by northern squawfish (Ptychocheilus oregonensis) on juvenile salmonids in the Columbia River
James H. Petersen, Donald L. DeAngelis
1992, Canadian Journal of Fisheries and Aquatic Sciences (49) 2551-2565
The behavior of individual northern squawfish (Ptychocheilus oregonensis) preying on juvenile salmonids was modeled to address questions about capture rate and the timing of prey captures (random versus contagious). Prey density, predator weight, prey weight, temperature, and diel feeding pattern were first incorporated into predation equations analogous to Holling Type...
