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Page 429, results 10701 - 10725

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Benthic macrofauna data for San Francisco Bay, California, September 1986
Laurence E. Schemel, J.K. Thompson, J.G. Harmon, B. T. Yost
1995, Open-File Report 95-291
Benthic macrofauna were collected during September 1986 to evaluate locations for long-term monitoring stations as part of the U.S. Geological Survey Regional Effects Monitoring Program in San Francisco Bay, California. Three to ten replicate samples were collected with a modified Van Veen sampler (0.05 m2 area) at ten locations. One...
Evaluation of lipid-containing semipermeable membrane devices for monitoring organochlorine contaminants in the Upper Mississippi river
Geoffrey S. Ellis, Colleen E. Rostad, James N. Huckins, Christopher J. Schmitt, Patrick MacCarthy
1995, Environmental Toxicology and Chemistry (14) 1875-1884
Organochlorine contaminants sequestered in lipid-containing semipermeable membrane devices (SPMDs) were compared to those found in tangential-flow ultrafilter permeates as part of a pilot study at 10 sites in the Upper Mississippi River system. Caged and feral fish from three primary sites were also analyzed for comparison. Concentrated organochlorine (OC) compounds...
An empirical model of the phytoplankton chlorophyll : carbon ratio-the conversion factor between productivity and growth rate
James E. Cloern, Christian Grenz, Lisa Vidergar-Lucas
1995, Limnology and Oceanography (40) 1313-1321
We present an empirical model that describes the ratio of phytoplankton chlorophyll a to carbon, Chl: C, as a function of temperature, daily irradiance, and nutrient-limited growth rate. Our model is based on 219 published measurements of algal cultures exposed to light-limited or nutrient-limited growth conditions. We illustrate an approach...
Use of a reactive gas transport model to determine rates of hydrocarbon biodegradation in unsaturated porous media
Arthur L. Baehr, Ronald J. Baker
1995, Water Resources Research (31) 2877-2882
A mathematical model is presented that simulates the transport and reaction of any number of gaseous phase constituents (e.g. CO2, O2, N2, and hydrocarbons) in unsaturated porous media. The model was developed as part of a method to determine rates of hydrocarbon biodegradation associated with natural cleansing at petroleum product...
Modeling hexavalent chromium reduction in groundwater in field-scale transport and laboratory batch experiments
J.C. Friedly, J.A. Davis, D.B. Kent
1995, Water Resources Research (31) 2783-2794
A plausible and consistent model is developed to obtain a quantitative description of the gradual disappearance of hexavalent chromium (Cr(VI)) from groundwater in a small-scale field tracer test and in batch kinetic experiments using aquifer sediments under similar chemical conditions. The data exhibit three distinct timescales. Fast reduction occurs in...
Characterizing water quality in the North Fork-Fall Creek Hydrologic Unit Area, Tennessee
Thomas Duane Byl, H. C. Mattraw
1995, Open-File Report 95-372
The North Fork-Fall Creek Watershed in Bedford County, Tennessee is a karst terrain with a complex interconnection between ground water and the surface water-drainage network. Multiple sources of agricultural and domestic contamination make the effective design of best management practices difficult. Ongoing investigations by the U.S. Geological Survey and several...
Collection of short papers on Beaver Creek watershed studies in West Tennessee, 1989-94
W. Harry. Doyle (compiler), Eva G. Baker
1995, Open-File Report 95-156
In 1989, the U.S. Geological Survey began a scientific investigation to evaluate the effect of agricultural activities on water quality and the effectiveness of agricultural best management practices in the Beaver Creek watershed, West Tennessee. The project is being conducted jointly with other Federal, State, county agencies, the farming community,...
Hydrologic and geochemical effects on oxygen uptake in bottom sediments of an effluent-dominated river
P.B. McMahon, J.A. Tindall, J.A. Collins, K.J. Lull, J.R. Nuttle
1995, Water Resources Research (31) 2561-2569
More than 95% of the water in the South Platte River downstream from the largest wastewater treatment plant serving the metropolitan Denver, Colorado, area consists of treated effluent during some periods of low flow. Fluctuations in effluent-discharge rates caused daily changes in river stage that promoted exchange of water between...
A Lagrangian stochastic model for aerial spray transport above an oak forest
Yansen Wang, David R. Miller, Dean E. Anderson, Michael L. McManus
1995, Agricultural and Forest Meteorology (76) 277-291
An aerial spray droplets' transport model has been developed by applying recent advances in Lagrangian stochastic simulation of heavy particles. A two-dimensional Lagrangian stochastic model was adopted to simulate the spray droplet dispersion in atmospheric turbulence by adjusting the Lagrangian integral time scale along the drop trajectory. The other major...
A computer program (MACPUMP) for interactive aquifer-test analysis
F. D. Day-Lewis, M.A. Person, Leonard F. Konikow
1995, Water-Resources Investigations Report 95-4012
This report introduces MACPUMP (Version 1.0), an aquifer-test-analysis package for use with Macintosh4 computers. The report outlines the input- data format, describes the solutions encoded in the program, explains the menu-items, and offers a tutorial illustrating the use of the program. The package reads list-directed aquifer-test data from a file,...
Lake-level frequency analysis for Devils Lake, North Dakota
Gregg J. Wiche, Aldo V. Vecchia
1995, Open-File Report 95-123
Two approaches were used to estimate future lake-level probabilities for Devils Lake. The first approach is based on an annual lake-volume model, and the second approach is based on a statistical water mass-balance model that generates seasonal lake volumes on the basis of seasonal precipitation, evaporation, and inflow.Autoregressive moving average...
Water-resources activities of the U.S. Geological Survey in Montana, October 1993 through September 1995
C. J. Harksen (compiler), Karen S. Midtlyng
1995, Open-File Report 95-194
Water-resources programs and activities of the U.S. Geological Survey in Montana consist principally of hydrologic-data collection and investigative studies that address water-resource issues. The work is supported by direct Federal funding, by transfer of funds from other Federal agencies, and by joint funding agreements with State or local agencies. The...
Hydrologic data of two wetlands at Spring City, Tennessee, December 1991 through November 1992
Gregory C. Johnson, Lawrence M. Brede
1995, Open-File Report 95-278
Hydrologic data for two small adjacent wetlands at Spring City, Tennessee, were collected from December 1991 through November 1992. One of the wetlands was natural and the other was constructed to replace a wetland disturbed by the construction of a road embankment. Water levels were monitored in five 7-inch-diameter wells,...
Sources of geologic and hydrologic information pertinent to ground-water resources in Rhode Island
Elaine C. Trench
1995, Open-File Report 93-464
This report summarizes sources of geologic and hydrologic information useful to water managers and others involved in the investigation, appraisal, development, and protection of ground-water resources in Rhode Island. The geographic scope of the report includes Rhode Island and small adjoining areas of Massachusetts and Connecticut, where drainage basins are...
A selected bibliography of water-related research in the upper Klamath Basin, Oregon
Dorie L. Brownell, Mia R. Rinallo
1995, Open-File Report 95-285
A bibliography containing 165 selected references was compiled to assist local, State, and Federal agencies that have ongoing water-related research interests in the Upper Klamath Basin. The report has two parts. Part 1 is a list of bibliographic citations alphabetized by author, and Part 2 is a subject index that...
Climatic and lake temperature data for Wetland P1, Cottonwood Lake Area, Stutsman County, North Dakota, 1982-87
Renee S. Parkhurst, A.M. Sturrock, D.O. Rosenberry, T. C. Winter
1995, Open-File Report 94-546
Research on the hydrology of Wetland P1 and the Cottonwood Lake Area includes the study of evaporation. Presented here in a graphical format are those data collected during the open-water seasons of 1982-87 that were needed for energy- budget and mass-transfer evaporation studies. The data include air temperatures, water surface...