Sediment transport at gaging stations near Mount St. Helens, Washington, 1980-90. Data collection and analysis
Randal L. Dinehart
1998, Professional Paper 1573
River sedimentation caused by the May 18, 1980, eruption of Mount St. Helens, Washington, has been monitored in a continuing program by the U.S. Geological Survey. In this report, sediment discharge and changes in sediment transport are summarized from data collected at stream-gaging stations near Mount St. Helens during the...
Early life history stages of Gulf sturgeon in the Suwannee River, Florida
K. J. Sulak, James P. Clugston
1998, Transactions of the American Fisheries Society (127) 758-771
Egg sampling confirmed that Suwannee River Gulf sturgeon Acipenser oxyrinchus desotoi, a subspecies of Atlantic sturgeon A. o. oxyrinchus use the same spawning site at river kilometer (rkm) 215 from the mouth of the river each year. Forty-nine eggs were recorded in 1995, and 368 were recorded in 1996. Spawning began 4–7...
Hydrology and snowmelt simulation of Snyderville Basin, Park City, and adjacent areas, Summit County, Utah
Lynette E. Brooks, James L. Mason, David D. Susong
1998, Technical Publication 115
Increasing residential and commercial development is placing increased demands on the ground- and surface-water resources of Snyderville Basin, Park City, and adjacent areas in the southwestern corner of Summit County, Utah. Data collected during 1993-95 were used to assess the quantity and quality of the water resources in the study...
Hydrogeology and groundwater quality of the glaciated valleys of Bradford, Tioga, and Potter Counties, Pennsylvania
John H. Williams, Larry E. Taylor, Dennis J. Low
1998, Water Resource Report 68
The most important sources of groundwater in Bradford, Tioga, and Potter Counties are the stratified-drift aquifers. Saturated sand and gravel primarily of outwash origin forms extensive unconfined aquifers in the valleys. Outwash is underlain in most major valleys by silt, clay, and very fine sand of lacustrine origin that comprise...
General philosophy 5: Concerning nonuniqueness
D. A. Chapin
1998, Book chapter, Geologic applications of gravity and magnetics: Case histories
There are models we might like to accept that just dont fit gravity, magnetic, or electrical data. This benefit of modeling is important. It forces the interpreter to prove that an interpretation is possible, and it eliminates impossible models even seismic models. A simple depth estimate may be all the...
General philosophy 3: Concerning modeling
D. A. Chapin
1998, Book chapter, Geologic applications of gravity and magnetics: Case histories
The trend toward modeling is a healthy change from the days when “prospects” were located solely on the basis of closures on residual maps of mysterious and sometimes secret origin. Although residual maps are valuable for helping us notice unusual relationships, the business of exploration has become less tolerant of...
Summary of ground-water quality in West Virginia
M.V. Mathes, Mark D. Kozar, David P. Brown
1998, Report
Water-quality data for the 28 sites in the West Virginia ambient ground-water-quality network and for wells in the U.S. Geological Survey National Water Information System (NWIS) data base for West Virginia were analyzed statistically to identify any water-quality trends and relations and to compare data from the two data sets....
Carolina slate belt gold deposits in Virginia, North Carolina, South Carolina, and Georgia
Robert A. Ayuso
1998, Report
The Southeastern United States, in particular, the Carolina slate belt of Virginia, North Carolina, South Carolina, and Georgia, has been an important region of mineral production (fig. 1). This region is thought to have major potential for containing large undiscovered deposits of gold and silver, as well as copper, lead,...
Predictive double-layer modeling of metal sorption in mine-drainage systems
K. S. Smith, J. F. Ranville, D.L. Macalady
E. A. Jenne, editor(s)
1998, Book chapter, Adsorption of metals by geomedia: Variables, mechanisms, and model applications
Previous comparison of predictive double-layer modeling and empirically derived metal-partitioning data has validated the use of the double-layer model to predict metal sorption reactions in iron-rich mine-drainage systems. The double-layer model subsequently has been used to model data collected from several mine-drainage sites in Colorado with diverse geochemistry and geology....
Fundamentals of isotope geochemistry
Carol Kendall, Eric A. Caldwell
1998, Book chapter, Isotope tracers in catchment hydrology
The dominant use of isotopes in catchment research in the last few decades has been to trace sources of waters and solutes. Generally, such data were evaluated with simple mixing models to determine how much was derived from either of the two (sometimes three) constant-composition sources. This chapter illustrates the...
Wetland connectivity and waterbird conservation in the western Great Basin of the United States: Introduction to workshop
Susan M. Haig, Lewis W. Oring
1998, Wader Study Group Bulletin (85) 19-20
As scientists, managers and landowners, we have come to realize that to best understand the local and regional value of individual wetlands, we need to take a broad geographic, taxonomic, and management view. In December 1994, a symposium was held in Reno, Nevada that addressed this topic for shorebirds by...
Landsat 7 science data users handbook
Water Resources Division, U.S. Geological Survey
1998, Report
First-generation site-response maps for the Los Angeles region based on earthquake ground motions
S. Hartzell, S. Harmsen, A. Frankel, D. Carver, E. Cranswick, M. Meremonte, J. Michael
1998, Bulletin of the Seismological Society of America (88) 463-472
Ground-motion records from aftershocks of the 1994 Northridge earthquake and mainshock records from the 1971 San Fernando, 1987 Whittier Narrows, 1991 Sierra Madre, and 1994 Northridge earthquakes are used to estimate site response relative to a rock site for the urban Los Angeles...
Variability of Secchi disk readings in an exceptionally clear and deep caldera lake
Gary L. Larson, M.W. Buktenica
1998, Archiv fur Hydrobiologie (141) 377-388
SUMMARY: The Peromyscus leucopus on a 17-acre study area were live-trapped, marked, and released over a seven-day period. On the three following nights intensive snap-trapping was done on the central acre of the study plot. The animals caught by snap traps in...
Estimating survival rates with age-structure data
Mark S. Udevitz, Brenda E. Ballachey
1998, Journal of Wildlife Management (62) 779-792
We developed a general statistical model that provides a comprehensive framework for inference about survival rates based on standing age-structure and ages-at-death data. Previously available estimators are maximum likelihood under the general model, but they use only 1 type of data and require the assumption of a stable age structure...
Ice sheet history from Antarctic Continental Margin sediments: The ANTOSTRAT approach
P.F. Barker, P. J. Barrett, Angelo Camerlenghi, Alan K. Cooper, F.J. Davey, E.W. Domack, C. Escutia, Y. Kristoffersen, P. E. O’Brien
1998, Terra Antarctica (5) 737-760
The Antarctic Ice Sheet is today an important part of the global climate engine, and probably has been so for most of its long existence. However, the details of its history are poorly known, despite the measurement and use, over two decades, of low-latitude proxies of ice sheet volume. An...
Windflow circulation patterns in a coastal dune blowout, south coast of Lake Michigan
G.S. Fraser, S.W. Bennett, G.A. Olyphant, N.J. Bauch, V. Ferguson, C.A. Gellasch, C.L. Millard, B. Mueller, P. J. O’Malley, J.N. Way, M.C. Woodfield
1998, Journal of Coastal Research (14) 451-460
The windflow patterns in a large active blowout in a coastal dune on the southern shore of Lake Michigan were intensively monitored during a two-day period when the predominant winds shifted from onshore (Day 1) to offshore (Day 2). The wind data were used in conjunction with mapped geomorphic features...
Flow modeling and permeability estimation using borehole flow logs in heterogeneous fractured formations
Frederick L. Paillet
1998, Water Resources Research (34) 997-1010
A numerical model of flow in the vicinity of a borehole is used to analyze flowmeter data obtained with high-resolution flowmeters. The model is designed to (1) precisely compute flow in a borehole, (2) approximate the effects of flow in surrounding aquifers on the measured borehole flow, (3) allow for...
Molybdate transport in a chemically complex aquifer: Field measurements compared with solute-transport model predictions
Kenneth G. Stollenwerk
1998, Water Resources Research (34) 2727-2740
A natural-gradient tracer test was conducted in an unconfined sand and gravel aquifer on Cape Cod, Massachusetts. Molybdate was included in the injectate to study the effects of variable groundwater chemistry on its aqueous distribution and to evaluate the reliability of laboratory experiments for identifying and quantifying reactions that control...
A decision support model to assess vulnerability to salt water intrusion in the great bend prairie aquifer of Kansas
M. Sophocleous, T. Ma
1998, Groundwater (36) 476-483
A relatively simple ground water decision support system (DSS) was developed to assist in identifying salt-water vulnerable areas and in developing management policies to prevent salt-water intrusion in central Kansas. The DSS is based on a combination of numerical modeling sensitivity analyses, multiple regression analyses,...
The interplinian activity at Somma-Vesuvius in the last 3500 years
G. Rolandi, P. Petrosino, Geehin J. Mc
1998, Journal of Volcanology and Geothermal Research (82) 19-52
Between 1884 B.C. and A.D. 472, eruptive activity at Somma-Vesuvius was dominated by the three plinian eruptions of Avellino (3550 yr B.P.), Pompei (A.D. 79) and A.D. 472 and, as a result, little attention has been given to the intervening interplinian activity. The interplinian events are here reconstructed using new...
Seasonal migration and homing of channel catfish in the lower Wisconsin River, Wisconsin
Thomas D. Pellett, Gene J. Van Dyck, Jean V. Adams
1998, North American Journal of Fisheries Management (18) 85-95
A multiyear tag and recapture study was conducted to determine whether channel catfishIctalurus punctatus were migratory and if they had strong homing tendencies. Over 10,000 channel catfish were tagged from the lower Wisconsin River and adjacent waters of the upper Mississippi River during the 3-year sampling period. Data on movements were...
Information-theoretic model selection and model averaging for closed-population capture-recapture studies
Thomas R. Stanley, Kenneth P. Burnham
1998, Biometrical Journal (40) 475-494
Specification of an appropriate model is critical to valid statistical inference. Given the “true model” for the data is unknown, the goal of model selection is to select a plausible approximating model that balances model bias and sampling variance. Model selection based on information criteria such as AIC or its...
Estimates of loss rates of jaw tags on walleyes
Steven P. Newman, Michael H. Hoff
1998, North American Journal of Fisheries Management (18) 202-205
The rate of jaw tag loss was evaluated for walleye Stizostedion vitreum in Escanaba Lake, Wisconsin. We estimated tag loss using two recapture methods, a creel census and fykenetting. Average annual tag loss estimates were 17.5% for fish recaptured by anglers and 27.8% for fish recaptured in fyke nets. However, fyke-net data...
AIRSLUG: A fortran program for the computation of type curves to estimate transmissivity and storativity from prematurely terminated air-pressurized slug tests
E.A. Greene, A.M. Shapiro
1998, Ground Water (36) 373-375
The Fortran code AIRSLUG can be used to generate the type curves needed to analyze the recovery data from prematurely terminated air-pressurized slug tests. These type curves, when used with a graphical software package, enable the engineer or scientist to analyze field tests to estimate transmissivity and storativity. Prematurely terminating...
