Conference Papers
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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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Access to spatial environmental data for development of an oil spill response geographic Access to spatial environmental data for development of an oil spill response geographic
No abstract available.
Authors
M.W. Hiland, M.R. Byrnes, R.A. McBride, S. Penland, K. Ramsey, K. Debusschere, S.J. Williams
3H and 14C as tracers of ground-water recharge 3H and 14C as tracers of ground-water recharge
Surface spreading of water from the Santa Clara River is used to recharge aquifers underlying the Oxnard Plain. These aquifers are divided into an upper system about 400 feet thick, and a lower system more than 1,000 feet thick. In previous studies, it has been reported that surface spreading recharged aquifers in both the upper and lower systems. Water from most wells perforated in the...
Authors
John A. Izbicki, Robert L. Michel, Peter Martin
A method for estimating regional drawdowns in local areas A method for estimating regional drawdowns in local areas
No abstract available
Authors
M. J. Focazio, G. K. Speiran
A semi-implicit finite difference model for three-dimensional tidal circulation, A semi-implicit finite difference model for three-dimensional tidal circulation,
A semi-implicit finite difference formulation for the numerical solution of three-dimensional tidal circulation is presented. The governing equations are the three-dimensional Reynolds equations in which the pressure is assumed to be hydrostatic. A minimal degree of implicitness has been introduced in the finite difference formula so that in the absence of horizontal viscosity the...
Authors
V. Casulli, R. T. Cheng
Acute toxicity testing of sediments Acute toxicity testing of sediments
No abstract available.
Authors
Pasquale F. Roscigno, Arthur V. Stiffey, W. David Burke, Diane K. Arwood
Approach to data exchange: the spatial data transfer standard Approach to data exchange: the spatial data transfer standard
Significant developments have taken place in the disciplines of cartography and geography in recent years with the advent of computer hardware and software that manipulate and process digital cartographic and geographic data more efficiently. The availability of inexpensive and powerful hardware and software systems offers the capability of displaying and analyzing spatial data to a...
Authors
Hedy J. Rossmeissl, Robert D. Rugg
Associations of free-living bacteria and dissolved organic compounds in a plume of contaminated groundwater Associations of free-living bacteria and dissolved organic compounds in a plume of contaminated groundwater
Associations of free-living bacteria (FLB) and dissolved organic contaminants in a 4-km-long plume of sewage-contaminated groundwater were investigated. Abundance of FLB in the core of the plume (as delineated by maximum specific conductance) steadily decreased in the direction of flow from a point 0.25 km downgradient from the source to the toe of the plume. At 0.25 km downgradient, FLB...
Authors
R.W. Harvey, L.B. Barber
Atmospheric circulation and precipitation in the Sierra Nevada Atmospheric circulation and precipitation in the Sierra Nevada
No abstract available
Authors
D.R. Cayan, L. Riddle
Causes of mortality in common loons Causes of mortality in common loons
Summarized are necropsy results from 222 carcasses of Common Loons (Gavia immer) submitted to the National Wildlife Health Research Center from 1976 through 1991. The carcasses were from 18 states, and 10 or more birds each were from Minnesota, Florida, Virginia, Michigan, Wisconsin, Maine, and North Carolina. Seventy-three (33%) carcasses were emaciated, and in some of these birds...
Authors
J. Christian Franson, David J. Cliplef
Changes in abundance of migratory land birds in conifer forests of western North America Changes in abundance of migratory land birds in conifer forests of western North America
No abstract available at this time
Authors
G. Cox, B.E. Kus
Classifying and mapping wetlands and peat resources using digital cartography Classifying and mapping wetlands and peat resources using digital cartography
Digital cartography allows the portrayal of spatial associations among diverse data types and is ideally suited for land use and resource analysis. We have developed methodology that uses digital cartography for the classification of wetlands and their associated peat resources and applied it to a 1:24 000 scale map area in New Hampshire. Classifying and mapping wetlands involves...
Authors
Cornelia C. Cameron, David A. Emery