Transport and time lag of chlorofluorocarbon gases in the unsaturated zone, Rabis Creek, Denmark
Peter Engesgaard, Anker L. Højberg, Klaus Hinsby, Karsten H. Jensen, Troels Laier, Flemming Larsen, Eurybiades Busenberg, Niel Plummer
2004, Vadose Zone Journal (3) 1249-1261
Transport of chlorofluorocarbon (CFC) gases through the unsaturated zone to the water table is affected by gas diffusion, air–water exchange (solubility), sorption to the soil matrix, advective–dispersive transport in the water phase, and, in some cases, anaerobic degradation. In deep unsaturated zones, this may lead to a time lag between...
A web-enabled system for integrated assessment of watershed development
R. Dymond, V. Lohani, B. Regmi, R. Dietz
2004, Conference Paper, Bridging the Gap: Meeting the World's Water and Environmental Resources Challenges - Proceedings of the World Water and Environmental Resources Congress 2001
Researchers at Virginia Tech have put together the primary structure of a web enabled integrated modeling system that has potential to be a planning tool to help decision makers and stakeholders in making appropriate watershed management decisions. This paper describes the integrated system, including data sources, collection, analysis methods, system...
Validation of two dilution models to predict chloramine-T concentrations in aquaculture facility effluent
M.P. Gaikowski, W.J. Larson, J. J. Steuer, W.H. Gingerich
2004, Aquacultural Engineering (30) 127-140
Accurate estimates of drug concentrations in hatchery effluent are critical to assess the environmental risk of hatchery drug discharge resulting from disease treatment. This study validated two dilution simple n models to estimate chloramine-T environmental introduction concentrations by comparing measured and predicted chloramine-T concentrations using the US Geological Survey's Upper...
A unified approach to analyzing nest success
T.L. Shaffer
2004, The Auk (121) 526-540
Logistic regression has become increasingly popular for modeling nest success in terms of nest-specific explanatory variables. However, logistic regression models for nest fate are inappropriate when applied to data from nests found at various ages, for the same reason that the apparent estimator of nest success is biased (i.e. older...
The wetland continuum: A conceptual framework for interpreting biological studies
N.H. Euliss Jr., J. W. LaBaugh, L.H. Fredrickson, D.M. Mushet, Murray K. Laubhan, G.A. Swanson, T. C. Winter, D.O. Rosenberry, R.D. Nelson
2004, Wetlands (24) 448-458
We describe a conceptual model, the wetland continuum, which allows wetland managers, scientists, and ecologists to consider simultaneously the influence of climate and hydrologic setting on wetland biological communities. Although multidimensional, the wetland continuum is most easily represented as a two-dimensional gradient, with ground water and atmospheric water constituting the...
Transmission of Neospora caninum between wild and domestic animals
L.F.P. Gondim, M.M. McAllister, N. E. Mateus-Pinilla, W. Pitt, L.D. Mech, M.E. Nelson, M.S. Lenarz
2004, Journal of Parasitology (90) 1361-1365
To determine whether deer can transmit Neospora caninum, brains of naturally infected white-tailed deer (Odocoileus virginianus) were fed to 4 dogs; 2 of these dogs shed oocysts. Oocysts from 1 of the dogs were tested by polymerase chain reaction and found to be positive for N. caninum and negative for Hammondia heydorni. The internal...
Hydrologic processes in deep vadose zones in interdrainage arid environments
Michelle Ann Walvoord, Bridget R. Scanlon
James F. Hogan, Fred M. Phillips, Bridget R. Scanlon, editor(s)
2004, Book chapter, Groundwater recharge in a desert environment: The southwestern United States (Water Science and Application, no. 9)
A unifying theory for the hydrology of desert vadose zones is particularly timely considering the rising population and water stresses in arid and semiarid regions. Conventional models cannot reconcile the apparent discrepancy between upward flow indicated by hydraulic gradient data and downward flow suggested by environmental tracer data in deep...
Commentary: A cautionary tale regarding use of the National Land Cover Dataset 1992
Wayne E. Thogmartin, Alisa L. Gallant, Melinda G. Knutson, Timothy J. Fox, Manuel J. Suarez
2004, Wildlife Society Bulletin (32) 970-978
Digital land-cover data are among the most popular data sources used in ecological research and natural resource management. However, processes for accurate land-cover classification over large regions are still evolving. We identified inconsistencies in the National Land Cover Dataset 1992, the most current and available representation of land cover for...
Simulating the dynamics of linear forests in Great Plains agroecosystems under changing climates
Q. Guo, J.R. Brandle, M.M. Schoeneberger, D. Buettner
2004, Canadian Journal of Forest Research (34) 2564-2572
Most forest growth models are not suitable for the highly fragmented, linear (or linearly shaped) forests in the Great Plains agroecosystems (e.g., windbreaks, riparian forest buffers) where such forests are a minor but ecologically important component of the land mosaics. This study used SEEDSCAPE, a recently modified gap model designed...
Photomosaics and logs of trenches on the San Andreas Fault, Thousand Palms Oasis, California
Thomas E. Fumal, William T. Frost, Christopher Garvin, John C. Hamilton, Monique Jaasma, Michael J. Rymer
2004, Open-File Report 2003-449
We present photomosaics and logs of the walls of trenches excavated for a paleoseismic study at Thousand Palms Oasis (Fig. 1). The site is located on the Mission Creek strand of the San Andreas fault zone, one of two major active strands of the fault in the Indio Hills along...
Using discrete choice modeling to generate resource selection functions for female polar bears in the Beaufort Sea
George M. Durner, Steven C. Amstrup, Ryan M. Nielson, Trent McDonald
Snehalata Huzurbazar, editor(s)
2004, Conference Paper, Resource selection methods and applications: Proceedings of the 1st International Conference on Resource Selection
Polar bears (Ursus maritimus) depend on ice-covered seas to satisfy life history requirements. Modern threats to polar bears include oil spills in the marine environment and changes in ice composition resulting from climate change. Managers need practical models that explain the distribution of bears in order to assess the...
The Parkfield experiment; capturing what happens in an earthquake
Steve Hickman, John O. Langbein, Peter H. Stauffer
2004, Fact Sheet 049-02
To better understand what happens on and near a fault before, during, and after an earthquake, the U.S. Geological Survey (USGS) and the California Geological Survey began the Parkfield Earthquake Experiment in the 1980's. Researchers from the USGS and collaborating institutions have created a dense network of instruments on the...
Chapter A3. Cleaning of equipment for water sampling
Franceska D. Wilde, editor(s)
2004, Techniques of Water-Resources Investigations 09-A3
The National Field Manual for the Collection of Water-Quality Data (National Field Manual) describes protocols and provides guidelines for U.S. Geological Survey (USGS) personnel who collect data used to assess the quality of the Nation's surface-water and ground-water resources. Chapter A3 describes procedures for cleaning the equipment used to collect...
Water resources data, Louisiana, water year 2003
Todd Baumann, B.B. Goree, W.M. Lovelace, P.A. Montgomery, J.C. Resweber, Garron B. Ross, D.C. Sasser Jr., D.J. Walters
2004, Water Data Report LA-03-1
Water resources data for the 2003 water year for Louisiana consist of records of stage, discharge, and water quality of streams; stage, contents, and water quality of lakes and reservoirs; and water levels and water quality of ground water. This report contains records for water discharge at 76 gaging stations;...
Water Resources Data, Nebraska, Water Year 2003
D.E. Hitch, S.H. Hull, V.C. Walczyk, J.D. Miller, R.A. Drudik
2004, Water Data Report NE-03-1
The Nebraska water resources data report for water year 2003 includes records of stage, discharge, and water quality of streams; water elevation and/or contents of lakes and reservoirs; and water levels and quality of ground water in wells. This report contains records of stream stage for 3 stations; stream discharge...
Water Resources Data, Arizona, Water Year 2003
G. G. Fisk, N.R. Duet, D.W. Evans, C.E. Angeroth, N.K. Castillo, S.A. Longsworth
2004, Water Data Report AZ-03-1
The Arizona District water data report includes records on both surface water and ground water in the State for water year 2003. Specifically, it contains: (1) discharge records for 203 streamflow-gaging stations, for 29 crest-stage, partial-record streamflow stations, and 50 miscellaneous sites; (2) stage and (or) content only records for...
Water resources data, North Carolina, water year 2003. Volume 1A: Surface-water records
B.C. Ragland, D. A. Walters, G.D. Cartano, J.E. Taylor
2004, Water Data Report NC-03-1A
Water-resources data for the 2003 water year for North Carolina consist of records of stage, discharge, water quality for streams; stage and contents for lakes and reservoirs; precipitation; and ground-water levels and water quality of ground water. Volume 1 contains discharge records for 213 gaging stations; stage for 61 gaging...
Regional Relations in Bankfull Channel Characteristics determined from flow measurements at selected stream-gaging stations in West Virginia, 1911-2002
Terence Messinger, Jeffrey B. Wiley
2004, Water-Resources Investigations Report 2003-4276
Three bankfull channel characteristics?cross-sectional area, width, and depth?were significantly correlated with drainage area in regression equations developed for two regions in West Virginia. Channel characteristics were determined from analysis of flow measurements made at 74 U.S. Geological Survey stream-gaging stations at flows between 0.5 and 5.0 times bankfull flow between...
Water resources data, North Carolina, water year 2003. Volume 1B: Surface-water records
B.C. Ragland, R.G. Barker, J. B. Robinson
2004, Water Data Report NC-03-1B
Water-resources data for the 2003 water year for North Carolina consist of records of stage, discharge, water quality for streams; stage and contents for lakes and reservoirs; precipitation; and ground-water levels and water quality of ground water. Volume 1 contains discharge records for 213 gaging stations; stage for 61 gaging...
Water Resources Data, Georgia, 2003, Volume 1: Continuous water-level, streamflow, water-quality data, and periodic water-quality data, Water Year 2003
Andrew C. Hickey, John F. Kerestes, Brian E. McCallum
2004, Water Data Report GA-03-1
Water resources data for the 2003 water year for Georgia consists of records of stage, discharge, and water quality of streams; and the stage and contents of lakes and reservoirs published in two volumes in a digital format on a CD-ROM. Volume one of this report contains water resources data...
Water Resources Data, Georgia, 2003, Volume 2: Continuous ground-water-level data, and periodic surface-water- and ground-water-quality data, Calendar Year 2003
Robert Coffin, Susan C. Grams, David C. Leeth, Michael F. Peck
2004, Water Data Report GA-03-2
Water Resources Data, Puerto Rico and the U.S. Virgin Islands, Water Year 2002
Pedro L. Diaz, Zaida Aquino, Carlos Figueroa-Alamo, Rene Garcia, Ana V. Sanchez
2004, Water Data Report PR-02-1
The Water Resources Division of the U.S. Geological Survey, in cooperation with local and Federal agencies obtains a large amount of data pertaining to the water resources of the Commonwealth of Puerto Rico and the Territory of the U.S. Virgin Islands each water year. These data, accumulated during many water...
Relations between total-sediment load and peak discharge for rainstorm runoff on five ephemeral streams in Wyoming
J.G. Rankl
2004, Water-Resources Investigations Report 2002-4150
Total-sediment loads transported by ephemeral flows are a function of rainstorm energy and peak discharge. Rainstorm energy, estimated by rainfall intensity, is the primary mechanism for soil-particle detachment. Vegetation, soil cohesiveness, and land slope also are related to the amount of sediment detached, but these factors remain nearly constant, except...
Surface-water quality-assurance plan for the U.S. Geological Survey Washington Water Science Center
David L. Kresch, Stewart A. Tomlinson
2004, Open-File Report 2003-490
This Surface-Water Quality-Assurance Plan documents the standards, policies, and procedures used by the U.S. Geological Survey's Washington District, Water Resources Discipline office, also known as the Washington Water Science Center, for activities related to the collection, processing, storage, analysis, and publication of surface-water data. This plan serves as a guide...
Rectified images of selected geologic maps in the Northern Rockies Area, Idaho, Montana, Washington, and Wyoming
Jeremy C. Larsen, Kenneth C. Assmus, J. Douglas Causey, Michael L. Zientek
2004, Data Series 106
Selected geologic maps covering parts of the Northern Rocky Mountains and adjacent areas were converted to raster images and georeferenced (rectified) for use in a geographic information system (GIS). These rectified images were created for the purpose of visually comparing published geologic maps with other geospatial information. However, they cannot...
