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.
Filter Total Items: 5326
Development of ground-water vulnerability database for the U.S. Environmental protection agency's hazard ranking system using a geographic information system
Geographic information system (GIS) methods were applied to the U.S. Environmental Protection Agency's (EPA) hazard ranking system (HRS) to evaluate the vulnerability of ground water to contamination from actual or potential releases of hazardous materials from waste-disposal sites. Computerized maps of four factors influencing ground-water vulnerability - hydraulic conductivity, sorptive capacity
Authors
John S. Clarke, Jerry W. Sorensen, Henry G. Strickland, George Collins
Development of spatial data guidelines and standards: spatial data set documentation to support hydrologic analysis in the U.S. Geological Survey
Spatial data analysis has become an integral component in many surface and sub-surface hydrologic investigations within the U.S. Geological Survey (USGS). Currently, one of the largest costs in applying spatial data analysis is the cost of developing the needed spatial data. Therefore, guidelines and standards are required for the development of spatial data in order to allow for data sharing and
Authors
James L. Fulton
Diel feeding ecology of the fish community on the Juniata River, Pennsylvania
No abstract available at this time
Authors
D. S. Dropkin, J. H. Johnson
Disappearing coastal wetlands
No abstract available.
Authors
James B. Johnston, Donald W. Field, Anthony J. Reyer
Effects of acidic deposition on the erosion of carbonate stone - experimental results from the U.S. National Acid Precipitation Assessment Program (NAPAP)
One of the goals of NAPAP-sponsored research on the effects of acidic deposition on carbonate stone has been to quantify the incremental effects of wet and dry deposition of hydrogen ion, sulfur dioxide and nitrogen oxides on stone erosion. Test briquettes and slabs of freshly quarried Indiana limestone and Vermont marble have been exposed to ambient environmental conditions in a long-term exposur
Authors
P. A. Baedecker, M.M. Reddy, K.J. Reimann, C.A. Sciammarella
Effects of flow and smoltification on the migration rates of spring Chinook salmon and steelhead
No abstract available
Authors
J.W. Beeman, D.W. Rondorf
Effects of saline ground-water discharge on water quality of the Red River of the North, northeastern North Dakota
No abstract available.
Authors
M.L. Strobel, P.J. Gerla
Environmental influences on major waterfowl diseases
The decline of North American waterfowl resources since the 1960s is well-known to this audience and need not be detailed to establish that population numbers for several key waterfowl species are at or near their lowest levels since records have been kept. Loss of habitat is an accepted major cause for the decline of waterfowl numbers and the wildlife conservation community is responding with ini
Authors
M. Friend
Geochemical heterogeneity in a sand and gravel aquifer: Effect of sediment mineralogy and particle size on the sorption of chlorobenzenes
The effect of particle size, mineralogy and sediment organic carbon (SOC) on solution of tetrachlorobenzene and pentachlorobenzene was evaluated using batch-isotherm experiments on sediment particle-size and mineralogical fractions from a sand and gravel aquifer, Cape Cod, Massachusetts. Concentration of SOC and sorption of chlorobenzenes increase with decreasing particle size. For a given particl
Authors
L.B. Barber, E.M. Thurman, D.R. Runnells
Geology of Keweenawan Supergroup Rocks near the Porcupine Mountains, Ontonagon and Gogebic Counties, Michigan
This field trip examines the geology of rocks of the Keweenawan Supergroup (1 .1 Ga) and related intrusive rocks of the Midcontinent rift system (MRS) in the western part of the northern peninsula of Michigan. The combination of stops includes all formations of the Keweenawan Supergroup in this region. Examination of all described localities requires more than a single day and participants are enc
Authors
William F. Cannon, Suzanne W. Nicholson, Cheryl A. Hedgman, Laurel G. Woodruff, Klaus J. Schul
Geomorphic response to the 1989-90 eruptions of Redoubt Volcano, Alaska
No abstract available.
Authors
J.M. Dorava
Ground-water-quality monitoring for septic-tank-use effects, central New Mexico
No abstract available
Authors
G.E. Kues