Hydrology of the Sevier-Sigurd ground-water basin and other ground-water basins, central Sevier Valley, Utah.
P. M. Lambert, J. L. Mason, R. W Puchta
1995, Technical Publication 103
The hydrologic system in the central Sevier Valley, and more specifically the Sevier-Sigurd basin, is a complex system in which surface- and ground-water systems are interrelated. Seepage from an extensive irrigation system is the primary source of recharge to the basin-fill aquifer in the Sevier-Sigurd basin.Water-quality data indicate that inflow...
Three-dimensional inverse modelling using heads and concentrations at a Danish landfill
Heidi Christiansen Barlebo, Mary C. Hill, Dan Rosbjerg, Karsten H. Jensen
1995, Conference Paper, Models for Assessing and Monitoring Groundwater Quality
A three-dimensional inverse model using hydraulic heads and concentrations of non-reactive solutes is presented. Application to the Danish Grindsted Old Landfill is used to investigate how the concentration data affects estimates of horizontal and vertical hydraulic conductivity and longitudinal dispersivity as well as prediction uncertainty...
Modeling and predicting intertidal variations of the salinity field in the Bay/Delta
Noah Knowles, Reginald J. Uncles
1995, Interagency Ecological Program Newsletter 8-10
San Francisco Bay and the Sacramento/San Joaquin Delta have challenged estuarine modelers for some years. Accurate, broad-scale models of this estuary have been in demand by those concerned with its ecological health and the development of sound management policies. A description and better understanding of the dynamics that govern the...
Pathway models could aid management of contaminants
S. N. Luoma
1995, Interagency Ecological Program Newsletter 6-8
Heavy metal and trace organic contaminants are often cited as factors that could affect the riclmess of the biological community of San Francisco Bay as well as the health of resident organisms. Silver (Ag), selenium (Se), mercury (Hg), copper (Cu), nickel (Ni), chromium (Cr), and cadmium (Cd) are among the...
Long-term simulation of PCB export from the Fox River to Green Bay
M.L. Velleux, Douglas Endicott, Jeffrey Steuer, Dale Patterson, Steven Jaeger
1995, Journal of Great Lakes Research (21) 359-372
A mass balance approach was used to model long-term PCB transport in the Fox River (Wisconsin) from Lake Winnebago to Green Bay. The objectives of this research were to (1) extend the modeling approach for the Fox River to permit realistic long-term simulations of contaminant transport and fate, (2) forecast...
Changes in winter air temperatures near Lake Michigan, 1851-1993, as determined from regional lake-ice records
R. A. Assel, Dale M. Robertson
1995, Limnology and Oceanography (40) 165-176
Records of freezeup and breakup dates for Grand Traverse Bay, Michigan, and Lake Mendota, Wisconsin, are among the longest ice records available near the Great Lakes, beginning in 185 1 and 1855, respectively. The timing of freezeup and breakup results from an integration of meteorological conditions (primarily air temperature) that...
Transient hydrogeological controls on the chemistry of a seepage lake
David P. Krabbenhoft, Katherine E. Webster
1995, Water Resources Research (31) 2295-2305
A solute mass balance method was used to estimate groundwater inflow and outflow rates for Nevins Lake, Michigan, a seepage lake in the upper peninsula that historically has shown extremely variable water chemistry compared with most other seepage lakes. A 4-year study (1989–1992) of the hydrology and geochemistry of Nevins...
Earthquake geodesy and hazard monitoring
K.W. Hudnut
1995, Reviews of Geophysics (33) 249-255
Catastrophic events such as major earthquakes and volcanic eruptions result when the earth's crust fails in response to accumulated deformation. The accumulation of deformation results from ongoing processes such as aseismic deformation of subcrustal rock associated with relative plate motions, or the ascent of magma through a volcanic plumbing system....
Recent advances in simulation-optimization groundwater management modeling
B.J. Wagner
1995, Reviews of Geophysics (33) 1021-1028
In recent years, the aquifer simulation model has been combined with techniques of optimization to address important groundwater management problems. The combined simulation and optimization model accounts for the complex behavior of the groundwater system and identifies the best management strategy under consideration of the management objectives and constraints. Simulation-optimization...
Modeling of multiphase multicontaminant transport in the subsurface
T.F. Russell
1995, Reviews of Geophysics (33) 1035-1047
This review addresses modeling of subsurface hydrological systems in which contaminants are transported in more than one fluid phase. The primary focus is on problems involving nonaqueous-phase liquids (NAPLs), a dynamic gas phase, or both, so that the unsaturated and saturated zones are both discussed. Basic research in simpler settings...
Volcano seismology, hazards assessment
J. Mori
1995, Reviews of Geophysics (33) 263-267
The last few years have seen several impressive examples of seismic monitoring at volcanoes to provide warnings that have saved lives and property. Changes in the rates and character of volcanic earthquakes provided precursory signs to explosive eruptions of moderate size at Redoubt volcano (Alaska), Mount Unzen (Japan), Mount Spurr...
Survival estimation and the effects of dependency among animals
Joel A. Schmutz, David H. Ward, James S. Sedinger, Eric A. Rexstad
1995, Journal of Applied Statistics (22) 673-681
Survival models assume that fates of individuals are independent, yet the robustness of this assumption has been poorly quantified. We examine how empirically derived estimates of the variance of survival rates are affected by dependency in survival probability among individuals. We used Monte Carlo simulations to generate known amounts of...
Mark-resighting analysis of a California gull population
Bruce H. Pugesek, Chris Nations, K.L. Diem, Roger Pradel
1995, Journal of Applied Statistics (22) 625-639
California gulls (Larus californicus) of known age and sex were censused on their breeding colony in 1979, 1980 and 1984 through 1993. Ages of 235 males and 196 females ranged from 4 to 27 years. Age classes used in the analysis were limited to 17, 4 through 19, and 20...
Estimating annual survival and movement rates of adults within a metapopulation of roseate terns
Jeffrey A. Spendelow, James D. Nichols, Ian C. T. Nisbet, Helen Hays, Grace Cormons, Joanna Burger, C. Safina, James E. Hines, Michael Gochfeld
1995, Ecology (76) 2415-2428
Several multistratum capture—recapture models were used to test various hypotheses about possible geographic and temporal variation in survival, movement, and recapture/resighting probabilities of 2399 adult Roseate Terns (Sterna dougallii) color—banded from 1988 to 1992 at the sites of the four largest breeding colonies of this species in the northeastern USA....
Winter range arrival and departure of white-tailed deer in northeastern Minnesota
M.E. Nelson
1995, Canadian Journal of Zoology (73) 1069-1076
I analyzed 364 spring and 239 fall migrations by 194 white-tailed deer (Odocoileus virginianus) from 1975 to 1993 in northeastern Minnesota to determine the proximate cause of arrivals on and departures from winter ranges. The first autumn temperatures below -7?C initiated fall migrations for 14% (95% confidence interval (CI)...
Hydrologic modeling as a predictive basis for ecological restoration of salt marshes
C. T. Roman, R.W. Garvine, J. W. Portnoy
1995, Environmental Management (19) 559-566
Roads, bridges, causeways, impoundments, and dikes in the coastal zone often restrict tidal flow to salt marsh ecosystems. A dike with tide control structures, located at the mouth of the Herring River salt marsh estuarine system (Wellfleet, Massachusetts) since 1908, has effectively restricted tidal exchange, causing changes in marsh vegetation...
Environmental auditing: Capabilities and management utility of recreation impact monitoring programs
J. L. Marion
1995, Environmental Management (19) 763-771
A recreation impact monitoring system was developed and applied in 1984?1986 and in 1991 to all backcountry river-accessed campsites within Delaware Water Gap National Recreation Area, Pennsylvania and New Jersey. Results suggest that actions implemented by park managers in response to problems identified by the initial survey were highly effective...
Estimation and confidence intervals for empirical mixing distributions
W.A. Link, J.R. Sauer
1995, Biometrics (51) 810-821
Questions regarding collections of parameter estimates can frequently be expressed in terms of an empirical mixing distribution (EMD). This report discusses empirical Bayes estimation of an EMD, with emphasis on the construction of interval estimates. Estimation of the EMD is accomplished by substitution of estimates of prior parameters...
North American migratory bird management issues
M.H. Wilson, D.A. Ryan
1995, Conference Paper, Wildlife Society Annual Conference
As human population and industry have grown in North America, land-use practices have greatly altered the landscape. As a result of this changed landscape, several migratory bird populations have declined in recent years. For waterbirds, there have been several milestones: the 1986 North American Waterfowl Management Plan (NAWMP)...
Beach-steps: An evolutionary perspective
B.O. Bauer, J.R. Allen
1995, Marine Geology (123) 143-166
Field observation of contrasting beach-step behavior at Canaveral National Seashore on two subsequent days when incident-wave conditions in the inner surf zone were similar prompted this re-examination of our conceptual and quantitative understanding of beach steps. These lower-foreshore features are more complex...
Deep subsurface microbial processes
Derek R. Lovley, F. H. Chapelle
1995, Reviews of Geophysics (33) 365-381
Information on the microbiology of the deep subsurface is necessary in order to understand the factors controlling the rate and extent of the microbially catalyzed redox reactions that influence the geophysical properties of these environments. Furthermore, there is an increasing threat that deep aquifers, an important drinking water resource, may...
Artificial insemination and cryopreservation of semen from nondomestic birds
G.F. Gee
M.R. Bakst, G.J. Wishart, editor(s)
1995, Book chapter, Proceedings of the First International Symposium on the Artificial Insemination of Poultry
Studies of Al and cryopreservation of semen from nondomestic birds began because of the increased emphasis on conservation of avian species threatened with extinction. Over the years, aviculturists have developed techniques for Al and cryopreservation of semen obtained from a variety of birds ranging from passerines to Andean condors. Generally,...
Modeling shoreline dynamics at Sandy Hook, New Jersey, USA
J.R. Allen, B. Shaw, A.F. Lange
1995, Book chapter, CoastGIS '95, International Symposium on GIS and Computer Mapping for Coastal Zone Management, Cork, Ireland February 3-5, 1995
Patterns of prey selection by wolves in Denali National Park, Alaska
L. David Mech, T.J. Meier, John W. Burch, Layne G. Adams
Ludwig N. Carbyn, Steven H. Fritts, Dale R. Seip, editor(s)
1995, Occasional Publication of the Canadian Circumpolar Institute 35
The patterns of selection by wolves (Canis lupus) preying on moose (Alces alces), caribou (Rangifer tarandus), and Dall sheep (Ovis dalli) in Denali National Park and Preserve, Alaska were studied from 1986 through early 1992. Wolves and their prey are legally protected or relatively unharvested in most of the area,...
A capture-recapture survival analysis model for radio-tagged animals
K. H. Pollock, C.M. Bunck, Scott R. Winterstein, Chiu-Lan Chen
P.M. North, J.D. Nichols, editor(s)
1995, Book chapter, Statistics and ornithology. Proceedings of the 4th EURING technical meeting, 19-24 September, 1994
In recent years, survival analysis of radio-tagged animals has developed using methods based on the Kaplan-Meier method used in medical and engineering applications (Pollock et al., 1989a,b). An important assumption of this approach is that all tagged animals with a functioning radio can be relocated at each sampling time with...
