Modeling hurricane effects on mangrove ecosystems
Thomas W. Doyle
1997, Fact Sheet 095-97
Mangrove ecosystems are at their most northern limit along the coastline of Florida and in isolated areas of the gulf coast in Louisiana and Texas. Mangroves are marine-based forests that have adapted to colonize and persist in salty intertidal waters. Three species of mangrove trees are common to the United...
Characterization of springflow in the north coast limestone of Puerto Rico using physical, chemical, and stable isotopic methods
Jesús Rodríguez-Martínez
1997, Water-Resources Investigations Report 97-4122
The carbonate sequence of middle Tertiary age of the north coast of Puerto Rico is characterized by the presence of numerous springs in the coastal areas. In order to advance the understanding of the hydrologic role of the springs in the north coast limestone aquifer system of Puerto Rico, a...
Dissolved oxygen in the Tualatin River, Oregon, during winter flow conditions, 1991 and 1992
Valerie J. Kelly
1997, Water Supply Paper 2465-A
This report describes the capacity of the Tualatin River to assimilate oxygen-demanding material during winter streamflow conditions, with an emphasis on peak-flow and winter base-flow conditions. The study examined major processes governing concentrations of dissolved oxygen (DO) in the river under different streamflow conditions, as well as the effect of...
Water and salt balance of Great Salt Lake, Utah, and simulation of water and salt movement through the causeway
Steven R. Wold, Blakemore E. Thomas, Kidd M. Waddell
1997, Water Supply Paper 2450
The water and salt balance of Great Salt Lake primarily depends on the amount of inflow from tributary streams and the conveyance properties of a causeway constructed during 1957-59 that divides the lake into the south and north parts. The conveyance properties of the causeway originally included two culverts, each...
Hydrologic budgets of regional aquifer systems of the United States for predevelopment and development conditions
Richard H. Johnston
1997, Professional Paper 1425
Ground-water budgets are presented in this report for 14 regionally extensive aquifer systems; pumpage from 11 of these systems provided from 40 to 50 percent of the ground water withdrawn in the United States during the 1970's and 1980's. The budgets are based on simulation results from computer-based models developed...
Map showing outcrop of the coal-bearing units and land use in the Gulf Coast region
1997, Open-File Report 97-172
This map is a preliminary compilation of the outcrop geology of the known coal-bearing units in the Gulf Coast Coal region. The map has been compiled for use in the National Coal Resource Assessment Project currently being conducted by the U.S. Geological Survey, and will be updated as the assessment...
Sub-crop geologic map of pre-Tertiary rocks in the Yucca Flat and northern Frenchman Flat areas, Nevada Test Site, southern Nevada
J. C. Cole, Anita G. Harris, Ronald R. Wahl
1997, Open-File Report 97-678
This map displays interpreted structural and stratigraphic relations among the Paleozoic and older rocks of the Nevada Test Site region beneath the Miocene volcanic rocks and younger alluvium in the Yucca Flat and northern Frenchman Flat basins. These interpretations are based on a comprehensive examination and review of data for...
Documentation of R-UNSAT, a computer model for the simulation of reactive, multispecies transport in the unsaturated zone
Matthew A. Lahvis, Arthur L. Baehr
1997, Open-File Report 97-630
No abstract available....
Progress report on sediment analyses at selected faunal monitoring sites in north-central and northeastern Florida Bay
T.M. Scott, G.H. Means, G. L. Brewster-Wingard
1997, Open-File Report 97-534
Florida Bay is a shallow, subtropical lagoon at the southern tip of the Florida peninsula. The 2200 square kilometer, triangular-shaped area is the site of modern carbonate sediment formation and deposition. The intricate ecosystem of the bay has undergone significant changes as the result of natural influences and human intervention....
Modes of occurrence of trace elements in samples from a coal cleaning plant
Curtis A. Palmer, Allan Kolker, Robert B. Finkelman, K.C. Kolb, Stanley J. Mroczkowski, S.S. Crowley, H. E. Belkin, J. H. Bullock Jr., J. M. Motooka
1997, Open-File Report 97-732
No abstract available....
Geologic map of the Dillon quadrangle, Summit and Grand Counties, Colorado
Karl S. Kellogg
1997, Open-File Report 97-738
New 1:24,000-scale geologic mapping along the Interstate-70 urban corridor in western Colorado, in support of the USGS Central Region State/USGS Cooperative Geologic Mapping Project, is contributing to a more complete understanding of the stratigraphy, structure, tectonic evolution, and hazard potential of this rapidly developing region. The 1:24,000-scale Dillon quadrangle...
A predictive production rate life-cycle model for southwestern Virginia coalfields
Robert C. Milici, Elizabeth Campbell
1997, Circular 1147
Geochemistry and microbiology of iron-related well-screen encrustation and aquifer biofouling in Suffolk County, Long Island, New York
D. A. Walter
1997, Water-Resources Investigations Report 97-4032
Iron-related well-screen encrustation and aquifer biofouling has decreased the specific capacity of several production wells in Suffolk County, N.Y., and has forced the Suffolk County Water Authority to adopt a costly well-reconditioning and replacement program. The specific-capacity declines are the result of the precipitation of iron oxyhydroxides and the...
Model-estimated ground-water recharge and hydrograph of ground-water discharge to a stream
A. T. Rutledge
1997, Water-Resources Investigations Report 97-4253
The computer model PULSE, described in this report, can be used to construct a hydrograph of ground-water discharge to a stream. The model is applicable to a ground-water flow system that is driven by areally uniform recharge to the water table, and in which ground water discharges to a gaining...
PHREEQCI: A graphical user interface for the geochemical computer program PHREEQC
Scott R. Charlton, Clifford L. Macklin, David L. Parkhurst
1997, Water-Resources Investigations Report 97-4222
PhreeqcI is a Windows-based graphical user interface for the geochemical computer program PHREEQC. PhreeqcI provides the capability to generate and edit input data files, run simulations, and view text files containing simulation results, all within the framework of a single interface. PHREEQC is a multipurpose geochemical program that can perform...
CRINOIDS; a computer animation and paper model
Tau Rho Alpha, Dorothy L. Stout, Scott W. Starratt
1997, Open-File Report 97-91-B
Geohydrology and simulations of ground-water flow at Verona well field, Battle Creek, Michigan, 1988
E. A. Lynch, N.G. Grannemann
1997, Water-Resources Investigations Report 97-4068
Public water supply for the city of Battle Creek, Mich. is withdrawn from the Marshall Sandstone through wells at the Verona well field. Analysis of borehole acoustic televiewer, gamma, and single-point-resistance logs from wells in Bailey Park, near the well field, indicates 12 fracture zones in the Marshall Sandstone. Further...
Interim results of quality-control sampling of surface water for the Upper Colorado River National Water-Quality Assessment Study Unit, water years 1995-96
N.E. Spahr, R.W. Boulger
1997, Water-Resources Investigations Report 97-4227
Quality-control samples provide part of the information needed to estimate the bias and variability that result from sample collection, processing, and analysis. Quality-control samples of surface water collected for the Upper Colorado River National Water-Quality Assessment study unit for water years 1995?96 are presented and analyzed in this report. The...
Ground-water flow in the Saginaw aquifer in the vicinity of the north Lansing well field, Lansing Michigan — Part 2, simulations with a regional model using a reduced cell size
C. L. Luukkonen, N.G. Grannemann, D. J. Holtschlag
1997, Open-File Report 97-570
Vinyl chloride has been detected in water from the Saginaw aquifer near Lansing Board of Water and Light wells in the north Lansing well field. These public-supply wells have the potential to withdraw contaminated ground water. The effects of reduced grid spacing for the existing TriCounty regional ground-water-flow model on...
Ground-water flow in the Saginaw aquifer in the vicinity of the north Lansing well field, Lansing Michigan — Part 1, simulations with a regional model
C. L. Luukkonen, N.G. Grannemann, D. J. Holtschlag
1997, Open-File Report 97-569
Vinyl chloride has been detected in water from the Saginaw aquifer near Lansing Board of Water and Light wells in the north Lansing well field. These public-supply wells have the potential to withdraw contaminated ground water. Groundwater-flow simulations and particle-tracking analyses with a regional model were used to investigate local...
Modeling of sand movement storage in the Colorado River through the Grand Canyon
Stephen Mark Wiele
1997, Fact Sheet 227-96
Hydrogeologic framework and simulation of ground-water flow and travel time in the shallow aquifer system in the area of Naval Support Activity Memphis, Millington, Tennessee
James L. Robinson, John K. Carmichael, Keith J. Halford, David E. Ladd
1997, Water-Resources Investigations Report 97-4228
Naval Support Activity (NSA) Memphis is a Department of the Navy facility located at the City of Millington, Tennessee, about 5 miles north of Memphis. Contaminants have been detected in surface-water, sediment, and ground-water samples collected at the facility. As part of the Installation Restoration Program, the Navy is considering...
Unit-area loads of suspended sediment, suspended solids and total phosphorus from small watersheds in Wisconsin
Steven R. Corsi, David J. Graczyk, David W. Owens, Roger T. Bannerman
1997, Fact Sheet 195-97
Watershed planners in the Wisconsin Department of Natural Resources (WDNR) and in Wisconsin county governments use estimates of loads of total solids and total phosphorus in streams for numerous management purposes. A few examples of these are to establish load reduction goals, to estimate the relative magnitude of nonpoint sources...
Sources of contamination in an urban basin in Marquette, Michigan and an analysis of concentrations, loads, and data quality
Jeffrey Steuer, William Selbig, Nancy J. Hornewer, Jeffrey Prey
1997, Water-Resources Investigations Report 97-4242
The concentrations of contaminants generated from discrete source areas are critical to urban nonpoint Source Load and Management Model (SLAMM) loading calculations to Lake Superior. This study summarizes data-collection efforts during 12 storms in October 1993 and from May through August 1994, in which stormwater data were collected concurrently at...
Future of the US National Strong-Motion Program
Committee for the Future of the US National Strong-Motion Program
1997, Open-File Report 97-530
These reports are presented in response to a charge of the Earthquake Hazards Reduction Program (EHRP) Program Council of the U.S. Geological Survey to 'define the future of the USGS National Strong-Motion Program (NSMP)' (Appendix A). The council requested that a 'Vision Paper' and an 'Options Document' be prepared. Each...
