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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Applications of isotopes to tracing sources of solutes and water in shallow systems Applications of isotopes to tracing sources of solutes and water in shallow systems
New awareness of the potential danger to water supplies posed by the use of agricultural chemicals has focused attention on the nature of groundwater recharge and the mobility of various solutes, especially nitrate and pesticides, in shallow systems. A better understanding of hydrologic flowpaths and solute sources is required to determine the potential impact of sources of contamination...
Authors
Carol Kendall, David P. Krabbenhoft
Areal extent of freshwater from an experimental release of Mississippi River Water into Lake Pontchartrain, Louisiana, May 1994 Areal extent of freshwater from an experimental release of Mississippi River Water into Lake Pontchartrain, Louisiana, May 1994
The effects of the release of freshwater from the Mississippi river into the Lake Pontchartrain was evaluated. The study determined the delineation of the areal extent of the freshwater plume in the lake, intensively sampled lake and river water and bed sediment to determine the effects on water quality in the lake, and performed a dye study to determine the mixing characteristics of the...
Authors
Brian E. McCallum
Assessment of information on ground-water/surface-water interactions in the northern midcontinent Assessment of information on ground-water/surface-water interactions in the northern midcontinent
Ground-water/surface-water interactions are important to the hydrology of shallow aquifers, streams, lakes, and wetlands. Information on ground-water/surface-water interactions in the northern midcontinent was assessed. The ground-water/surface-water interactions in physiographic and climatic areas that contain many wetlands differed from the interactions in areas that consisted...
Authors
Michael L. Strobel
Band recoveries of diurnal raptors banded in the Marin Headlands, Marin County, California Band recoveries of diurnal raptors banded in the Marin Headlands, Marin County, California
No abstract available at this time
Authors
K.L. Scheuerman, M.A. Weeks, J. A. Howell
Biotic and abiotic processes controlling water chemistry during snowmelt at rabbit ears pass, Rocky Mountains, Colorado, U.S.A. Biotic and abiotic processes controlling water chemistry during snowmelt at rabbit ears pass, Rocky Mountains, Colorado, U.S.A.
The chemical composition of snowmelt, groundwater, and streamwater was monitored during the spring of 1991 and 1992 in a 200-ha subalpine catchment on the western flank of the Rocky Mountains near Steamboat Springs, Colorado. Most of the snowmelt occurred during a one-month period annually that began in mid-May 1991 and mid-April 1992. The average water quality characteristics of...
Authors
N.E. Peters, G.H. Leavesley
Can we manage for biological diversity in the absence of science? Can we manage for biological diversity in the absence of science?
Conservation of biological diversity is dependent on sound scientific information about underlying ecological processes. Current knowledge of the composition, distribution, abundance and life cycles of most species of plants and animals is incomplete, insufficient, unreliable, or nonexistent. Contemporary managers are also confronted with additional levels of complexity related to...
Authors
D.L. Trauger, R.J. Hall
Census methodologies of Black-legged Kittiwakes in Glacier Bay National Park Census methodologies of Black-legged Kittiwakes in Glacier Bay National Park
Black-legged Kittiwakes (Rissa tridactyla) have recently experienced widespread population declines and frequent colony failures throughout the North Pacific. At Glacier Bay National Park, the Margerie Glacier colony was censused visually in 1991 through 1993. In 1993 a new photographic census technique was also tested to assess its feasibility, accuracy, and ease of use, Three years of...
Authors
Elizabeth Ross Hooge
Channel degradation in southeastern Nebraska Rivers Channel degradation in southeastern Nebraska Rivers
Many stream channels in southeastern Nebraska were dredged and straightened during 1904-15. The resulting channels were both shorter and steeper than the original channels. Tests for time trends were conducted using the nonparametric Kendall tau test to see if the channels have responded to these changes. Tests were conducted on the stages associated with specific discharges and on...
Authors
Kenneth L. Wahl, Linda S. Weiss
Comparative behavior and dietary effects in early life stages of American sturgeons Comparative behavior and dietary effects in early life stages of American sturgeons
No abstract available at this time
Authors
R. M. Ross, R. M. Bennett
Contraction scour at a bridge over Wolf Creek, Iowa Contraction scour at a bridge over Wolf Creek, Iowa
Contraction scour at the State Highway 14 bridge over Wolf Creek in south-central Iowa was caused by a large flood on September 14 and 15, 1992. The bridge is a 30.5-m, single-span steel structure supported by vertical-wall concrete abutments with wingwalls. Approximately 6 meters of scour resulted from the flood. The peak discharge was estimated by water-surface profile analysis to be 2...
Authors
Edward E. Fischer
Correlation of Ordovician rocks of northern Alaska Correlation of Ordovician rocks of northern Alaska
The Ordovician sequences presented in this report were chosen to cover a range of depositional and structural settings found in northern Alaska. Consequently, the quality of lithostratigraphic, paleontologic, and sedimentologic data is variable. Until 1982, Ordovician rocks in northern Alaska were known only from a few, widely separated localities. Since then, several hundred Ordovician...
Authors
Anita G. Harris, Julie A. Dumoulin, John E. Repetski, Claire Carter
Creating habitat for endangered species: use of restored riparian woodlands by least Bell's vireos Creating habitat for endangered species: use of restored riparian woodlands by least Bell's vireos
No abstract available at this time
Authors
B.E. Kus