Characterization of water quality and simulation of temperature, nutrients, biochemical oxygen demand, and dissolved oxygen in the Wateree River, South Carolina, 1996-98
Toby D. Feaster, Paul Conrads
2000, Water-Resources Investigations Report 99-4234
In May 1996, the U.S. Geological Survey entered into a cooperative agreement with the Kershaw County Water and Sewer Authority to characterize and simulate the water quality in the Wateree River, South Carolina. Longitudinal profiling of dissolved-oxygen concentrations during the spring and summer of 1996 revealed dissolved-oxygen minimums occurring upstream...
Atlas of relations between climatic parameters and distributions of important trees and shrubs in North America; additional conifers, hardwoods, and monocots
Robert S. Thompson, Katherine H. Anderson, Patrick J. Bartlein, Sharon A. Smith
2000, Professional Paper 1650-C
This volume explores the continental-scale relations between climate and the geographic ranges of woody plant species in North America. A 25-km equal-area grid of modern climatic and bioclimatic parameters for North America was constructed from instrumental weather records. The geographic distributions of selected tree and shrub species were digitized, and...
Hydrogeology of the gray limestone aquifer in southern Florida
Ronald S. Reese, Kevin J. Cunningham
2000, Water-Resources Investigations Report 99-4213
Results from 35 new test coreholes and aquifer-test, water-level, and water-quality data were combined with existing hydrogeologic data to define the extent, thickness, hydraulic properties, and degree of confinement of the gray limestone aquifer in southern Florida. This aquifer, previously known to be present only in southeastern Florida (Miami-Dade, Broward,...
MODFLOW-2000, The U.S. Geological Survey modular ground-water model: User guide to modularization concepts and the ground-water flow process
Arlen W. Harbaugh, Edward R. Banta, Mary C. Hill, Michael G. McDonald
2000, Open-File Report 00-92
MODFLOW is a computer program that numerically solves the three-dimensional ground-water flow equation for a porous medium by using a finite-difference method. Although MODFLOW was designed to be easily enhanced, the design was oriented toward additions to the ground-water flow equation. Frequently there is a need to solve additional equations;...
Lateral ramps in the folded Appalachians and in overthrust belts worldwide— A fundamental element of thrust-belt architecture
Howard A. Pohn
2000, Bulletin 2163
Lateral ramps are zones where decollements change stratigraphic level along strike; they differ from frontal ramps, which are zones where decollements change stratigraphic level perpendicular to strike. In the Appalachian Mountains, the surface criteria for recognizing the subsurface presence of lateral ramps include (1) an abrupt change in wavelength or...
Sources, instream transport, and trends of nitrogen, phosphorus, and sediment in the lower Tennessee River basin, 1980-96
Anne B. Hoos, J. A. Robinson, R. A. Aycock, R.R. Knight, M. D. Woodside
2000, Water-Resources Investigations Report 99-4139
In 1997, the U.S. Geological Survey (USGS) began an assessment of the lower Tennessee River Basin as part of the National Water-Quality Assessment Program. Existing nutrient and sediment data from 1980 to 1996 were compiled, screened, and interpreted to estimate watershed inputs from nutrient sources, provide a general description...
New earthquake catalog reexamines Hawaii's seismic history
Thomas L. Wright, Fred W. Klein
2000, Eos, Transactions, American Geophysical Union (81) 101-107
On April 2,1868, an earthquake of magnitude 7.9 occurred beneath the southern part of the island of Hawaii. The quake, which was felt throughout all of the Hawaiian Islands, had a Modified Mercalli (MM) intensity of XII near its source.The destruction caused by a quake that large is nearly complete....
Airborne electromagnetics (EM) as a three-dimensional aquifer-mapping tool
Jeff Wynn, Don Pool, Mark Bultman, Mark E. Gettings, Jean Lemieux
2000, Book, Proceedings Volume, SAGEEP-2000 Conference
The San Pedro River in southeastern Arizona hosts a major migratory bird flyway, and was declared a Riparian Conservation Area by Congress in 1988. Recharge of the adjacent Upper San Pedro Valley aquifer was thought to come primarily from the Huachuca Mountains, but the U. S. Army Garrison of Fort...
Graphical user interface for MODFLOW, Version 4
Richard B. Winston
2000, Open-File Report 2000-315
No abstract available....
Use of the 'Legal-Institutional Analysis Model' for resolving environmental disputes involving hydropower
Nina Burkardt, Berton Lee Lamb
2000, Conference Paper, Trends in water and environmental engineering for safety and life: eco-compatible solutions for aquatic environments
No abstract available....
Disruption and restoration of en route habitat, a case study: The Chenier Plain
Wylie C. Barrow Jr., Chao-Chieh Chen, Robert B. Hamilton, Keith Ouchley, Terry J. Spengler
2000, Studies in Avian Biology (20) 71-87
Cheniers (relict beach ridges) and other habitats adjacent to ecological barriers may be critical linkages in the migratory pathways of long-distance migratory birds. It is important that these wooded habitats provide enough food and cover at the right time to support these birds’ requirements. To date, little attention has been given to the...
Comparison of wintering redhead populations in four Gulf of Mexico seagrass beds
Thomas C. Michot
2000, Conference Paper, Limnology and aquatic birds: Monitoring, modelling and management
No abstract available....
The modern Earth narrative: Natural and human history of the Earth
R. J. Williams
2000, Book chapter, Earth matters: The Earth sciences, philosophy, and the claims of community
No abstract available....
An effective filter for removal of production artifacts in U.S. Geological Survey 7.5-minute digital elevation models
Michael J. Oimoen
2000, Conference Paper
Many digital elevation models (DEM) produced by the U.S. Geological Survey suffer from the presence of striping artifacts, which limit their utility. The most common approaches to filtering the affected DEMs rely on simple low-pass filters that blur fine details. A new filtering algorithm has been developed that isolates the...
Accounting for site effects in probabilistic seismic hazard analyses of southern California: Overview of the SCEC Phase III Report
Edward H. Field, SCEC Phase III Working Group
2000, Bulletin of the Seismological Society of America (90) S1-S31
This article presents an overview of the Southern California Earthquake Center (SCEC) Phase-III effort to determine the extent to which probabilistic seismic hazard analysis (PSHA) can be improved by accounting for site effects. The contributions made in this endeavor are represented in the various articles that compose this special issue...
Simulation of nitrous oxide and nitric oxide emissions from tropical primary forests in the Costa Rican Atlantic Zone
Shu-Guang Liu, William A. Reiners, Michael Keller, Davis S. Schimel
2000, Environmental Modelling and Software (15) 727-743
Nitrous oxide (N2O) and nitric oxide (NO) are important atmospheric trace gases participating in the regulation of global climate and environment. Predictive models on the emissions of N2O and NO emissions from soil into the atmosphere are required. We modified the CENTURY model (Soil Sci. Soc. Am. J., 51...
USGS mineral deposit models
William D. Heran
D. B. Stoeser, editor(s)
2000, Data Series 64
This CD-ROM publication is a compilation of 29 previously published mineral deposit model and related reports of the USGS. It in part reflects a history of mineral deposit model development within the USGS. Model types presented include descriptive, grade-tonnage, geoenvironmental, and geophysical. These models generally compile the geologic, geochemical, and...
Digital data and geologic map of the Powder Mill Ferry Quadrangle, Shannon and Reynolds counties, Missouri
Robert C. McDowell, Richard W. Harrison, Kerry M. Lagueux
2000, IMAP 2722
The geology of the Powder Mill Ferry 7 1/2-minute quadrangle , Shannon and Reynolds Counties, Missouri was mapped from 1997 through 1998 as part of the Midcontinent Karst Systems and...
Ethoxyresorufin-O-deethylase (EROD) activity in fish as a biomarker of chemical exposure
J.J. Whyte, R.E. Jung, C. J. Schmitt, D. E. Tillitt
2000, Critical Reviews in Toxicology (30) 347-570
This review compiles and evaluates existing scientific information on the use, limitations, and procedural considerations for EROD activity (a catalytic measurement of cytochrome P4501A induction) as a biomarker in fish. A multitude of chemicals induce EROD activity in a variety of fish species, the most potent inducers being structural analogs...
Spherical and ellipsoidal volcanic sources at Long Valley caldera, California, using a genetic algorithm inversion technique
K. Tiampo, J. B. Rundle, J. Fernandez, J. O. Langbein
2000, Journal of Volcanology and Geothermal Research (102) 189-206
We model the second inflation period at Long Valley caldera, California using a genetic algorithm technique and high quality geodetic measurements of elevation changes and baseline extensions. We compare two source inversions for both spherical Mogi point sources and the finite prolate ellipsoid of Yang and Davis. A sensitivity analysis...
Simulation of aquifer tests and ground-water flowpaths at the local scale in fractured shales and sandstones of the Brunswick Group and Lockatong Formation, Lansdale, Montgomery County, Pennsylvania
Daniel J. Goode, Lisa A. Senior
2000, Open-File Report 2000-97
The U.S. Geological Survey, as part of technical assistance to the U.S. Environmental Protection Agency, has constructed and calibrated models of local-scale ground-water flow in and near Lansdale, Pa., where numerous sources of industrial contamination have been consolidated into the North Penn Area 6 Superfund Site. The local-scale models incorporate...
Assessment of the alluvial sediments in the Big Thompson River Valley, Colorado
Adrienne Barnett, Karl J. Ellefsen
2000, Data Series 66
To obtain subsurface geologic information about the alluvium in the Big Thompson River valley, S-wave refraction data were collected along three roads that cross the valley. The refraction data were used to estimate velocities and thickness for a layered-earth model; from these models, three cross sections of the river valley...
Preliminary potential-field constraints on the geometry of the San Fernando basin, Southern California
Victoria E. Langenheim, Andrew Griscom, R.C. Jachens, T.G. Hildenbrand
2000, Open-File Report 2000-219
Gravity and magnetic data provide new insights on the structural underpinnings of the San Fernando Basin region, which may be important to ground motion models. Gravity data indicate that a deep basin (>5 km) underlies the northern part of the San Fernando Valley; this deep basin is required to explain...
The Kyoto protocol and payments for tropical forest: An interdisciplinary method for estimating carbon-offset supply and increasing the feasibility of a carbon market under the CDM
Alexander S.P. Pfaff, Suzi Kerr, R. Flint Hughes, Shuguang Liu, G. Arturo Sanchez-Azofeifa, David Schimel, Joseph Tosi, Vicente Watson
2000, Ecological Economics (35) 203-221
Protecting tropical forests under the Clean Development Mechanism (CDM) could reduce the cost of emissions limitations set in Kyoto. However, while society must soon decide whether or not to use tropical forest-based offsets, evidence regarding tropical carbon sinks is sparse. This paper presents a general method for constructing an integrated...
Geohydrology and numerical simulation of groundwater flow in the central Virgin River Basin of Iron and Washington Counties, Utah
V.M. Heilweil, G. W. Freethey, C.D. Wilkowske, Bernard J. Stolp, Dale E. Wilberg
2000, Technical Publication 116
Because rapid growth of communities in Washington and Iron Counties, Utah, is expected to cause an increase in the future demand for water resources, a hydrologic investigation was done to better understand ground-water resources within the central Virgin River basin. This study focused on two of the principal ground-water reservoirs...
