Conference Papers
Science Quality and Integrity
The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
Browse almost 5,000 conference papers authored by our scientists and refine search by topic, location, year, and advanced search.
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Techniques and strategies for data integration in mineral resource assessment
The Geologic and the National Mapping divisions of the U.S. Geological Survey have been involved formally in cooperative research and development of computer-based geographic information systems (GISs) applied to mineral-resource assessment objectives since 1982. Experience in the Conterminous United States Mineral Assessment Program (CUSMAP) projects including the Rolla, Missouri; Dillon, Montana
Authors
Charles M. Trautwein, John L. Dwyer
Testing a method-of-characteristics model of three-dimensional solute transport in ground water
A new three-dimensional model of solute transport in groundwater that is based on a widely used two-dimensional method of characteristics model and is coupled to a modular finite-difference flow model is under development. The model's accuracy for ideal aquifers having homogeneous properties, uniform boundary conditions, and steady flow along a grid direction is demonstrated by comparison with con
Authors
Daniel J. Goode, Leonard F. Konikow
The application of current techniques in molecular biology for detection and control of infectious diseases in salmonid aquaculture
No abstract available
Authors
A.C. Fox, C.K. Arakawa, J. R. Winton
The ecological and evolutionary consequences of body size: Introductory remarks
No abstract available.
Authors
John F. Piatt
Tidal mass exchange between a submersed aquatic vegetation bed and the main channel of the Potomac River
Tidal mass exchange between a submersed aquatic vegetation (SAV) bed and the main channel of the Potomac River was investigated. Water levels were recorded at 5 minute intervals from August (when plants were present) through December (when plants were absent). Velocities were measured during individual tidal cycles both in the presence and absence of plants. Flow patterns were found to be altered
Authors
Harry L. Jenter, Nancy B. Rybicki, Robert A. Baltzer, Virginia Carter
Tolerance of juvenile lake trout exposed to gas supersaturation
No abstract available at this time
Authors
W. F. Krise, R. A. Smith
Ultrasonic velocity meter used in stream gaging
Many streams and canals in Florida are affected by tides or control structures and experience very low flow velocities at times. For example, the St. Johns River in northeastern Florida is affected by tides for about 140 miles upstream from its mouth and many canals in the Miami area of southeastern Florida are controlled by manmade structures and other elements that cause a variable backwater eff
Authors
L.D. Fayard
Uncertainty in climate change and drought
A series of projections of climate change were applied to a watershed model of the Delaware River basin to identify sources of uncertainty in predicting effects of climate change on drought in the basin as defined by New York City reservoir contents. The watershed model is a calibrated, monthly time-step water-balance model that incorporates the operation of reservoirs and diversion canals, and ac
Authors
Gregory J. McCabe, David M. Wolock, Gary D. Tasker, Mark A. Ayers
Use of electronic microprocessor-based instrumentation by the U.S. geological survey for hydrologic data collection
The U.S. Geological Survey is acquiring a new generation of field computers and communications software to support hydrologic data-collection at field locations. The new computer hardware and software mark the beginning of the Survey's transition from the use of electromechanical devices and paper tapes to electronic microprocessor-based instrumentation. Software is being developed for these micro
Authors
William G. Shope
Use of sediment-trace element geochemical models for the identification of local fluvial baseline concentrations
Studies have demonstrated the utility of fluvial bed sediment chemical data in assesing local water-quality conditions. However, establishing local background trace element levels can be difficult. Reference to published average concentrations or the use of dated cores are often of little use in small areas of diverse local petrology, geology, land use, or hydrology. An alternative approach entail
Authors
A. J. Horowitz, K. A. Elrick, C. R. Demas, D.K. Demcheck
Use of stable isotopes, tritium, soluble salts, and redox-sensitive elements to distinguish ground water from irrigation water in the Salton Sea basin
Evaporative concentration of irrigation water diverted from the Colorado River to the Salton Sea basin for several decades has produced an overlying system (that includes drainwater and surface waters) whose composition is highly variable and differs from that of the shallow regional ground water beneath it. The role of hydrologic and geochemical processes in causing these differences (and the var
Authors
Roy A. Schroeder, James G. Setmire, Jill N. Densmore
Variants of infectious hematopoietic necrosis virus selected with glycoprotein-specific monoclonal antibodies
No abstract available
Authors
K.W. Roberti, J. R. Winton, J. S. Rohovec