Modeling wetland and riparian vegetation change
Gregor T. Auble
1991, Book, Proceedings of an International Symposium: Wetlands and River Corridor Management
No abstract available....
The neotectonic setting of Puerto Rico
D.G. Masson, Kathryn M. Scanlon
1991, Geological Society of America Bulletin (103) 144-154
The island of Puerto Rico, in the northeast Caribbean, lies within a broad deformation zone between the Caribbean and North American plates. The simplest model for the tectonic setting of Puerto Rico has major strike-slip movement on nearly east-west lines in the vicinity of the Puerto Rico Trench coupled to...
Proterozoic geology and ore deposits of Arizona
Karl E. Karlstrom
1991, Book
Proterozoic rocks in Arizona have been the focus of interest for geologists since the late 1800's. Early investigations, led by the U.S. Geological Survey, focused on the extensive ore deposits hosted by Proterozoic rocks. By the 1960's, these studies, combined with theses from academic institutions and the efforts of the...
Predictive models of riparian vegetation response to altered streamflow
Gregor T. Auble, M. L. Scott, L.J. Martin, Lee S. Ischinger, C.A. Segelquist
1991, Report, South Platte River resource management: Finding a balance
No abstract available....
Application and partial validation of a habitat model for moose in the Lake Superior region
A.W. Allen, J.W. Terrell, W.L. Mangus, E. L. Lindquist
1991, Alces (27) 50-64
A modified version of the dormant-season portion of a Habitat Suitability Index (HSI) model developed for assessing moose (Alces alces) habitat in the Lake Superior Region was incorporated in a Geographic Information System (GIS) for 490 km2 of Minnesota's Superior National Forest. Moose locations (n=235) were plotted during aerial surveys...
Riparian vegetation of the Black Canyon of the Gunnison River, Colorado: composition and response to selected hydrologic regimes based on a direct gradient assessment model
Gregor T. Auble, Jonathan M. Friedman, Michael L. Scott
1991, Report
The Black Canyon of the Gunnison National Monument is located along the Gunnison River on the western slope of the Rocky Mountains in Montrose County, Colorado. The canyon is narrow because it is cut into resistant pre-Cambrian gneiss: it has a maximum depth of 900m and a minimum width of...
Multiple outer-reef tracts along the south Florida bank margin: Outlier reefs, a new windward-margin model
Barbara H. Lidz, A. C. Hine, Eugene A. Shinn, Jack L. Kindinger
1991, Geology (19) 115-118
High-resolution seismic-reflection profiles off the lower Florida Keys reveal a multiple outlier-reef tract system ~0.5 to 1.5 km sea-ward of the bank margin. The system is characterized by a massive, outer main reef tract of high (28 m) unburied relief that parallels the margin and at least two narrower, discontinuous...
Tectonic evolution of submarine canyons along the California continental margin
H. Gary Greene, Samuel H. Clarke Jr., Michael P. Kennedy
Robert H. Osborne, editor(s)
1991, Book chapter, From shoreline to abyss: Contributions in marine geology in honor of Francis Parker Shepard
The development of submarine canyons along active-plate margins commonly is influenced by tectonic processes. Recent studies of submarine canyons along the transform margin of western North America show that the origin and subsequent evolution of many canyons are correlatable with plate motion and plate-margin deformation. Elements of canyon morphology such...
Remote sensing snow leopard habitat in the trans-Himalaya of India using spatial models and satellite imagery
S.N. Prasad, Raghunandan S. Chundawat, D.O. Hunter, H. Panwar, G.S. Rawat
1991, Book, Resource Technology 90: Second international symposium on advanced technology in natural resource management
No abstract available....
A thermodynamic partition model for binding of nonionic organic compounds by organic colloids and implications for their sorption to soils and sediment
U.P. Chin, Walter J. Weber Jr., C. T. Chiou
R.A. Baker, editor(s)
1991, Book chapter, Organic substances and sediments in water: Humics and soils
No abstract available....
Evaluation of the instream flow incremental methodology by U.S. Fish and Wildlife Service field users
Carl L. Armour, Jonathan G. Taylor
1991, Fisheries (16) 36-43
This paper summarizes results of a survey conducted in 1988 of 57 U.S. Fish and Wildlife Service field offices. The purpose was to document opinions of biologists experienced in applying the Instream Flow Incremental Methodology (IFIM). Responses were received from 35 offices where 616 IFIM applications were reported. The existence...
Parameters involved in modeling movement of bacteria in groundwater
Ronald W. Harvey
C. J. Hurst, editor(s)
1991, Book chapter, Modeling the environmental fate of microorganisms
No abstract available....
Great lakes embryo mortality, edema, and deformities syndrome (glemeds) in colonial fish-eating birds: Similarity to chick-edema disease
Michael Gilbertson, Timothy J. Kubiak, James P. Ludwig, Glen Fox
1991, Journal of Toxicology and Environmental Health (33) 455-520
Several species of colonial fish-eating birds nesting in the Great Lakes basin Includ-ing herring gulls, common terns and double-crested cormorants, have exhibited chronic impairment of reproduction. In addition to eggshell thinning caused by high levels of DDT and metabolites, the reproductive impairment is characterized by high embryonic and chick mortality, edema,...
Pre-exploitation state of the Ahuachapán geothermal field, El Salvador
Z. Aunzo, C. Laky, B. Steingrimsson, G.S. Bodvarsson, M.J. Lippmann, A.H. Truesdell, C. Escobar, A. Quintanilla, G. Cuellar
1991, Geothermics (20) 1-22
The lithology and structural features of the Ahuachapán geothermal area and their impact on the movement of cold and hot fluids within the system are described, as well as the development and evaluation of the natural state model of the field. Four major lithologic units are present in Ahuachapán and...
Interfacing data analysis and numerical modeling for tidal hydrodynamic phenomena
R. T. Cheng, J.R. Burau, J. W. Gartner
B. B. Parker, editor(s)
1991, Book chapter, Tidal Hydrodynamics
No abstract available....
Exploration drilling and reservoir model of the Platanares geothermal system, Honduras, Central America
F. Goff, S.J. Goff, S. Kelkar, L. Shevenell, A.H. Truesdell, J. Musgrave, H. Rufenacht, W. Flores
1991, Journal of Volcanology and Geothermal Research (45) 101-123
Results of drilling, logging, and testing of three exploration core holes, combined with results of geologic and hydrogeochemical investigations, have been used to present a reservoir model of the Platanares geothermal system, Honduras. Geothermal fluids circulate at depths ??? 1.5 km in a region of active tectonism devoid of Quaternary...
Sensitivity analysis of a ground-water-flow model
Lynn J. Torak
Lennon Gerard P.Rouhani Shahrokh, editor(s)
1991, Conference Paper, Symposium on Ground Water
A sensitivity analysis was performed on 18 hydrological factors affecting steady-state groundwater flow in the Upper Floridan aquifer near Albany, southwestern Georgia. Computations were based on a calibrated, two-dimensional, finite-element digital model of the stream-aquifer system and the corresponding data inputs. Flow-system sensitivity was analyzed by computing water-level residuals obtained...
Simulation of vertical compaction in models of regional ground-water flow
S. A. Leake
Anon, editor(s)
1991, Conference Paper, IAHS Publication (International Association of Hydrological Sciences)
A new computer program was developed to simulate vertical compaction in models of regional ground-water flow. The program accounts for ground-water storage changes and compaction in discontinuous interbeds or in extensive confining beds. The new program is a package for the U.S. Geological Survey modular finite-difference ground-water flow model. Several...
Importance of hydrologic data for interpreting wetland maps and assessing wetland loss and mitigation
V. Carter
1991, Biological Report - US Fish & Wildlife Service (90) 79-85
The US Geological Survey collects and disseminates, in written and digital formats, groundwater and surface-water information related to the tidal and nontidal wetlands of the United States. This information includes quantity, quality, and availability of groundwater and surface water; groundwater and surface-water interactions (recharge-discharge); groundwater flow; and the basic surface-water...
Estimation of suspended-sediment rating curves and mean suspended-sediment loads
Charles G. Crawford
1991, Journal of Hydrology (129) 331-348
Suspended-sediment loads are often estimated from an empirical relation between suspended-sediment load (L) and streamflow (S). This relation is usually defined as a power function, L = aSh, and is referred to as a suspended-sediment rating curve. This function can be formulated as either a linear or non-linear model to...
Crustal resistivity structure from magnetotelluric soundings in the Colorado Plateau-Basin and Range provinces, central and western Arizona
D. P. Klein
1991, Journal of Geophysical Research (96) 12313-12331
Resistivity structure to about 25 km depth is defined from two-dimensional modeling of 29 magnetotelluric (MT) soundings (0.002–5 Hz) that traverse 280 km of the southwestern Colorado Plateau, transition zone, and Basin and Range provinces in Arizona. From the surface to 5 km depth, the MT...
Development and application of a hillslope hydrologic model
C. A. Blain, P. C. D. Milly
1991, Advances in Water Resources (14) 168-174
A vertically integrated two-dimensional lateral flow model of soil moisture has been developed. Derivation of the governing equation is based on a physical interpretation of hillslope processes. The lateral subsurface-flow model permits variability of precipitation and evapotranspiration, and allows arbitrary specification of soil-moisture retention properties. Variable slope, soil thickness, and...
A FORTRAN program for interpretation of relative permeability from unsteady-state displacements with capillary pressure included
E.O. Udegbunam
1991, Computers & Geosciences (17) 1351-1357
This paper presents a FORTRAN program for the determination of two-phase relative permeabilities from unsteady-state displacement data with capillary pressure terms included. The interpretative model employed in this program combines the simultaneous solution of a variant of the fractional flow equation which includes a capillary pressure term and an integro-differential...
Beatty, Nevada: A section in U.S. Geological Survey research in radioactive waste disposal - Fiscal years 1986-1990 (WRI 91-4084)
Brian J. Andraski, Jeffrey M. Fisher, David E. Prudic
1991, Conference Paper, U.S. Geological Survey research in radioactive waste disposal - Fiscal years 1986-1990 (WRI 91-4084)
A low-level radioactive-waste disposal facility in the Amargosa Desert of Nevada, about 17 km southeast of Beatty and 169 km northwest of Las Vegas, has been operating since 1962. This was the first commercially operated radioactive waste disposal facility in the United States. Wastes at the facility are emplaced in...
Band reporting rates for mallards with reward bands of different dollar values
James D. Nichols, Robert J. Blohm, Ronald E. Reynolds, Robert E. Trost, James E. Hines, Judith P. Bladen
1991, Journal of Wildlife Management (55) 119-126
Adult male mallards (Anas platyrhynchos) were banded in summer 1987 with reward bands of different dollar values (0-$400) to determine the lowest dollar value that would yield a reporting rate approaching 1.0. During the 1987-88 and 1988-89 hunting seasons, rewards of between 50 and $100 were required to yield a...
