A spatial model to aggregate point-source and nonpoint-source water-quality data for large areas
D.A. White, R. A. Smith, C. V. Price, R. B. Alexander, K. W. Robinson
1992, Computers & Geosciences (18) 1055-1073
More objective and consistent methods are needed to assess water quality for large areas. A spatial model, one that capitalizes on the topologic relationships among spatial entities, to aggregate pollution sources from upstream drainage areas is described that can be implemented on land surfaces having heterogeneous water-pollution effects. An infrastructure...
Seismic response of Pacific Park Plaza. I. Data and preliminary analysis
M. Çelebi, E. Safak
1992, Journal of Structural Engineering (118) 1547-1565
The objective of this paper is to present analyses of a set of acceleration response records obtained during the October 17, 1989 Loma Prieta earthquake (Ms = 7.1) from the 30-story, three-winged, ductile moment-resistant reinforced-concrete-framed Pacific Park Plaza Building, located in Emeryville, east of San Francisco, Calif. The building was...
Compositional gradients in large reservoirs of silicic magma as evidenced by ignimbrites versus Taylor Creek Rhyolite lava domes
W. A. Duffield, J. Ruiz
1992, Contributions to Mineralogy and Petrology (110) 192-210
The Taylor Creek Rhyolite of southwest New Mexico consists of 20 lava domes and flows that were emplaced during a period of a few thousand years or less in late Oligocene time. Including genetically associated pyroclastic deposits, which are about as voluminous as the lava domes and flows, the Taylor...
Study of salt transport processes in Delaware Bay
Roy Walters
1992, Conference Paper
The study described here is a subset of a broader climate-related study, and is focused primarily on salinity intrusion into Delaware Bay and River. Given changes in freshwater discharge into the Delaware River as determined from the larger study, and given probable sea level rise estimates, the purpose here is...
Residence times in river basins as determined by analysis of long-term tritium records
R. L. Michel
1992, Journal of Hydrology (130) 367-378
The US Geological Survey has maintained a network of stations to collect samples for the measurement of tritium concentrations in precipitation and streamflow since the early 1960s. Tritium data from outflow waters of river basins draining 4500–75000 km2 are used to determine average residence times of water within the basins. The...
Use of forecasting signatures to help distinguish periodicity, randomness, and chaos in ripples and other spatial patterns
D. M. Rubin
1992, Chaos (2) 525-536
Forecasting of one-dimensional time series previously has been used to help distinguish periodicity, chaos, and noise. This paper presents two-dimensional generalizations for making such distinctions for spatial patterns. The techniques are evaluated using synthetic spatial patterns and then are applied to a natural example: ripples formed in sand by blowing...
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...
Sources of nitrogen and phosphorus to Northern San Francisco Bay
S.W. Hager, L. E. Schemel
1992, Estuaries (15) 40-52
We studied nutrient sources to the Sacramento River and Suisun Bay (northern San Francisco Bay) and the influence which these sources have on the distributions of dissolved inorganic nitrogen (DIN) and dissolved reactive phosphorus (DRP) in the river and bay. We found that agricultural return flow drains and a...
Desk-top model buildings for dynamic earthquake response demonstrations
A. Gerald Brady
1992, Conference Paper, NIST Special Publication
Models of buildings that illustrate dynamic resonance behavior when excited by hand are designed and built. Two types of buildings are considered, one with columns stronger than floors, the other with columns weaker than floors. Combinations and variations of these two types are possible. Floor masses and column stiffnesses are...
Brine history indicated by argon, krypton, chlorine, bromine, and iodine analyses of fluid inclusions from the Mississippi Valley type lead-fluorite-barite deposits at Hansonburg, New Mexico
J.K. Böhlke, J.J. Irwin
1992, Earth and Planetary Science Letters (110) 51-66
Argon, krypton, chlorine, bromine, and iodine were measured in a homogeneous population of high-salinity hydrothermal fluid inclusions from the Tertiary-age Mississippi Valley-type (MVT) lead-fluorite-barite deposits at Hansonburg, New Mexico to establish new types of evidence for the history of both the fluid and the major dissolved salts. Noble gases and...
Quiet geomagnetic field representation for all days and latitudes
W.H. Campbell, E.R. Schiffmacher, B.R. Arora
1992, Journal of Geomagnetism & Geoelectricity (44) 459-480
This paper describes a technique for obtaining the quiet-time geomagnetic field variation expected for all days of the year and distribution of latitudes from a limited set of selected quiet days within a year at a discrete set of locations. We used a data set of observatories operated...
Groundwater flow, velocity, and age in a thick, fine-grained till unit in southeastern Wisconsin
W.W. Simpkins, K. R. Bradbury
1992, Journal of Hydrology (132) 283-319
Piezometer nests were installed at study sites in each of five north-south-trending end moraines of the late Pleistocene Oak Creek Formation in southeastern Wisconsin. The formation is composed primarily of a fine-grained glacial diamicton (till) and laterally continuous and discontinuous, coarse-grained lake and meltwater stream sediment. It overlies the Silurian...
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)...
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,...
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....
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...
A stochastic population model of mid-continental mallards
Rolf R. Koford, J.R. Sauer, Douglas H. Johnson, J.D. Nichols, M.D. Samuel
D.R. McCullough, R.H. Barrett, editor(s)
1992, Book, Wildlife 2001: Populations
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...
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...
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...
A new model for tabular-type uranium deposits
R.F. Sanford
1992, Economic Geology (87) 2041-2055
Tabular-type uranium deposits occur as tabular, originally subhorizontal bodies entirely within reduced fluvial sandstones of Late Silurian age or younger. This paper proposes that belts of tabular-type uranium deposits formed in areas of mixed local and regional ground-water discharge shortly after deposition of the host sediments. The general characteristics of...
Mini-Sosie high-resolution seismic method aids hazards studies
W. J. Stephenson, J. Odum, K. M. Shedlock, T. L. Pratt, R. A. Williams
1992, Eos, Transactions, American Geophysical Union (73) 473-476
A dramatic example of just how catastrophic earthquake damage can be occurred in 1989, when a nationally televised World Series game in San Francisco was preempted by the M 7.1 Loma Prieta earthquake. The surprising amount and distribution of damage reinforce the importance of seismic-hazard studies...
Public-domain-software solution to data-access problems for numerical modelers
Harry Jenter, Richard Signell
1992, Conference Paper
Unidata's network Common Data Form, netCDF, provides users with an efficient set of software for scientific-data-storage, retrieval, and manipulation. The netCDF file format is machine-independent, direct-access, self-describing, and in the public domain, thereby alleviating many problems associated with accessing output from large hydrodynamic models. NetCDF has programming interfaces in both...
Contribution of 222Rn in domestic water supplies to 222Rn in indoor air in Colorado homes
E.P. Lawrence, R. B. Wanty, P. Nyberg
1992, Health Physics (62) 171-177
The contribution of 222Rn from domestic water wells to indoor air was investigated in a study of 28 houses near Conifer, CO. Air concentrations determined by alpha-track detectors (ATDs) and continuous radon monitors were compared with the predictions of a single-cell model. In many of the houses, the water supply...
Modeling transport in transient ground-water flow: An unacknowledged approximation
Daniel J. Goode
1992, Ground Water (30) 257-261
During unsteady or transient ground-water flow, the fluid mass per unit volume of aquifer changes as the potentiometric head changes, and solute transport is affected by this change in fluid storage. Three widely applied numerical models of two-dimensional transport partially account for the effects of transient flow by removing terms...
