Options for water-level control in developed wetlands
J. R. Kelley Jr., M. K. Laubhan, F. A. Reid, J. S. Wortham, L. H. Fredrickson
1993, Book chapter, Waterfowl management handbook
Wetland habitats in the United States currently are lost at a rate of 260,000 acres/year (105,218 ha/year). Consequently, water birds concentrate in fewer and smaller areas. Such concentrations may deplete food supplies and influence behavior, physiology, and survival. Continued losses increase the importance of sound management of...
Population models for elk, mule deer, and moose on Yellowstone's northern range
J. A. Mack, Francis J. Singer
1993, Report, Ecological issues on reintroducing wolves into Yellowstone National Park
No abstract available....
Cogestion and recreation site demand: a model of demand-induced quality effects
Aaron J. Douglas, Richard L. Johnson
1993, Journal of Environmental Management (36) 201-203
This analysis focuses on problems of estimating site-specific dollar benefits conferred by outdoor recreation sites in the face of congestion costs. Encounters, crowding effects and congestion costs have often been treated by natural resource economists in a piecemeal fashion. In the current paper, encounters and crowding effects are treated systematically....
Instream flows according to the ASCE model water code
G. W. Sherk, Berton L. Lamb
1993, Book, Proceedings of the Water Planning and Management Division
No abstract available....
Monitoring beach changes using GPS surveying techniques
Robert Morton, Mark P. Leach, Jeffrey G. Paine, Michael A. Cardoza
1993, Journal of Coastal Research (9) 702-720
A need exists for frequent and prompt updating of shoreline positions, rates of shoreline movement, and volumetric nearshore changes. To effectively monitor and predict these beach changes, accurate measurements of beach morphology incorporating both shore-parallel and shore-normal transects are required. Although it is possible to monitor beach dynamics using land-based...
Fish habitat evaluation models in environmental assessments
Clair B. Stalnaker
1993, Book chapter, Environmental Analysis: The NEPA Experience
No abstract available....
A multi-sensor oceanographic measurement system for coastal environments
Marinna A. Martini, William J. Strahle
1993, Sea Technology (34) 666-671
An instrument system has been developed for long-term sediment transport studies that uses a modular design to combine off the shelf components into a complete and flexible package. A common data storage format is used in each instrument system so that the same hardware can be assembled in different ways...
Aspects of the biogeochemistry of methane in Mono Lake and the Mono Basin of California
Ronald S. Oremland, Laurence G. Miller, Charles Colbertson, S.W. Robinson, Richard L. Smith, Derek R. Lovley, Michael J. Whiticar, G. King, Ronald P. Kiene, Niels Iversen, Melinda Sargent
R. Oremland, editor(s)
1993, Book chapter, Biogeochemistry of global change
Above-ambient levels of methane and higher hydrocarbons were detected in the atmosphere of the Mono Basin. These gases emanated from several different sources, including natural gas seeps (thermogenic and biogenic), and methanogenic activity in sediments. Seeps were distributed over nearly 33% of the lake bottom and were also present...
Ground-water models: Validate or invalidate
J.D. Bredehoeft, Leonard F. Konikow
1993, Ground Water (31) 178-179
The word validation has a clear meaning to both the scientific community and the general public. Within the scientific community the validation of scientific theory has been the subject of philosophical debate. The philosopher of science, Karl Popper, argued that scientific theory cannot be validated, only invalidated. Popper’s view is...
A speculative history of the San Andreas fault in the central Transverse Ranges, California
R.J. Weldon II, K. E. Meisling, J. Alexander
Robert E. Powell, Jonathan C. Matti, editor(s)
1993, Book chapter, The San Andreas Fault system: Displacement, palinspastic reconstruction, and geologic evolution
It is generally accepted that the San Andreas fault formed between 4 and 5 Ma and that rocks west of it are now part of the Pacific plate, moving northwest relative to North America at 5 to 6 cm/yr. This model is inconsistent with the geologic record in the central...
Geochemical models
David L. Parkhurst, L.N. Plummer
William M. Alley, editor(s)
1993, Book chapter, Regional ground-water quality
No abstract available. ...
Forecasting contributions of lake whitefish year-classes to a Lake Superior commercial fishery from estimates of yearling abundance
Gary L. Curtis, Charles R. Bronte, James H. Selgeby
1993, North American Journal of Fisheries Management (13) 349-352
We developed a simple linear regression model to forecast year-class contributions of lake whitefish Coregonus clupeaformis to the commercial harvest in the Apostle Islands region of Lake Superior. We indexed year-class strength from catches of yearling fish in bottom trawl samples. Recruitment of each year-class was measured by its relative abundance in...
Using Pop-II models to predict effects of wolf predation and hunter harvests on elk, mule deer, and moose on the northern range
John A. Mack, Francis J. Singer
1993, Report, Ecological issues on reintroducing wolves into Yellowstone National Park
The effects of establishing a gray wolf (Canis lupus) population in Yellowstone National Park were predicted for three ungulate species—elk (Cervus elaphus), mule deer (Odocoileus hemionus), and moose (Alces alces)—using previously developed POP-II population models. We developed models for 78 and 100 wolves. For each wolf population, we ran...
Guidelines for the development of community level habitat evaluation models
Rick L. Schroeder, Sandra L. Haire
1993, Report
No abstract available....
Physical transport influencing biogeochemistry within the stream catchment continuum
Kenneth E. Bencala, John H. Duff, Judson W. Harvey, A.P. Jackman, F.J. Triska
A.J. Jakeman, M. Beck, J.J. McAleer, editor(s)
1993, Book chapter, Modelling change in environmental systems
No abstract available. ...
Modelling within the stream-catchment continuum
Kenneth E. Bencala, John H. Duff, Judson W. Harvey, A. P. Jackman, F.J. Triska
A.J. Jakeman, M. Beck, Ryan J. McAleer, editor(s)
1993, Book chapter, Modeling change in environmental systems
No abstract available....
Management model for predicting fall lamb:ewe ratios in desert bighorn sheep, Canyonlands National Park, Utah
C. L. Douglas
1993, Technical Report NPS/NRNAU/NRTP-93/10
No abstract available at this time...
Increasing waterfowl nesting success on islands and peninsulas
J. T. Lokemoen
1993, Fish and Wildlife Leaflet 13.2.11
Waterfowl that nest in uplands in the prairie pothole region have had low recruitment rates in recent decades, primarily because of predation. The loss of breeding waterfowl and their progeny has generated interest in management techniques that safeguard incubating hens and their eggs. Developing islands and peninsulas for nesting waterfowl...
A model of the productivity of the northern pintail
J.D. Carlson Jr., W.R. Clark, Erwin E. Klaas
1993, Biological Report 7
We adapted a stochastic computer model to simulate productivity of the northern pintail (Anas acuta). Researchers at the Northern Prairie Wildlife Research Center of the U.S. Fish and Wildlife Service originally developed the model to simulate productivity of the mallard (A. platyrhynchos). We obtained data and descriptive information on the...
Deposition of Franciscan Complex cherts along the paleoequator and accretion to the American margin at tropical paleolatitudes
J.T. Hagstrum, B.L. Murchey
1993, Geological Society of America Bulletin (105) 766-778
Red radiolarian cherts from three localities within the Franciscan subduction complex of northern California contain three components of remanent magnetization which are best isolated by progressive thermal demagnetization. The first component, usually removed by 300 °C, has an in situ direction similar to the present...
Factors influencing the composition of detrital heavy mineral suites in Holocene sands of the Apure River drainage basin, Venezuela
Andrew C. Morton
1993, Special Paper of the Geological Society of America (284) 171-186
Heavy mineral assemblages in rivers in the Apure River drainage basin of Venezuela and Colombia closely reflect the nature of the source regions, which lie in the Andean orogenic terranes to the west and northwest. The Caribbean Mountains, largely composed of greenschist-facies pelites, phyllites, carbonates, and metavolcanics, supply assemblages dominated...
Modern and ancient coal-forming environments
J.C. Cobb, C. B. Cecil, editor(s)
1993, Book
No abstract available ...
Exact Scheffé-type confidence intervals for output from groundwater flow models: 1. Use of hydrogeologic information
Richard L. Cooley
1993, Water Resources Research (29) 17-33
A new method is developed to efficiently compute exact Scheffé-type confidence intervals for output (or other function of parameters) g(β) derived from a groundwater flow model. The method is general in that parameter uncertainty can be specified by any statistical distribution having a log probability density function (log pdf) that can...
A model of glacier-ice dams: Programme with abstracts
1993, Conference Paper
Continuum-mechanics-based rheological formulation for debris flow
Cheng-lung Chen, Chi-Hai Ling
Shen Hsieh WenSu S.T.Wen Feng, editor(s)
1993, Conference Paper, Proceedings - National Conference on Hydraulic Engineering
This paper aims to assess the validity of the generalized viscoplastic fluid (GVF) model in the light of both the classical relative-viscosity versus concentration relation and the dimensionless stress versus shear-rate squared relations based on kinetic theory, thereby addressing how to evaluate the rheological parameters of the GVF model using...
