Conference Papers
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Browse almost 5,000 conference papers authored by our scientists and refine search by topic, location, year, and advanced search.
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Simulation and video animation of canal flushing created by a tide gate Simulation and video animation of canal flushing created by a tide gate
A tide-gate algorithm was added to a one-dimensional unsteady flow model that was calibrated, verified, and used to determine the locations of as many as five tide gates that would maximize flushing in two canal systems. Results from the flow model were used to run a branched Lagrangian transport model to simulate the flushing of a conservative constituent from the canal systems both...
Authors
David H. Schoellhamer
Simulation technique for modeling flow on floodplains and in coastal wetlands Simulation technique for modeling flow on floodplains and in coastal wetlands
The system design is premised on a proven, areal two-dimensional, finite-difference flow/transport model which is supported by an operational set of computer programs for input data management and model output interpretation. The purposes of the project are (1) to demonstrate the utility of the model for providing useful highway design information, (2) to develop guidelines and...
Authors
Raymond W. Schaffranek, Robert A. Baltzer
Stochastic system identification in structural dynamics Stochastic system identification in structural dynamics
Recently, new identification methods have been developed by using the concept of optimal-recursive filtering and stochastic approximation. These methods, known as stochastic identification, are based on the statistical properties of the signal and noise, and do not require the assumptions of current methods. The criterion for stochastic system identification is that the difference...
Authors
Erdal Safak
Summary of floods and droughts in the United States Summary of floods and droughts in the United States
This paper describes a current national analysis of streamflow data being conducted by the U.S. Geological Survey to identify and map, in a consistent State-by-State format, the frequency and areal distribution of major floods and droughts in the United States. The work is being performed as the latest in a series of National Water Summaries published as Geological Survey Water-Supply...
Authors
Marshall E. Jennings, Richard W. Paulson
System considerations in numerical modeling of estuarine problems, in Niki, H., and Kawahara, M., eds., computational methods in flow analysis System considerations in numerical modeling of estuarine problems, in Niki, H., and Kawahara, M., eds., computational methods in flow analysis
No abstract available
Authors
R. T. Cheng, J.R. Burau
Trace elements and pesticides in Salton Sea area, California Trace elements and pesticides in Salton Sea area, California
Concentrations of numerous potentially toxic trace elements and pesticides were determined in water, sediment, and biota from the Salton Sea area in southestern California. Comparison of results with data from other studies in this area and from other areas, and with various water-quality standards or criteria, indicate that selenium probably is the principal contaminant of concern in...
Authors
Roy A. Schroeder, James G. Setmire, John C. Wolfe
By
Transient spatial patterns in plankton communities: Blooms and traveling waves of phytoplankton in estuaries Transient spatial patterns in plankton communities: Blooms and traveling waves of phytoplankton in estuaries
No abstract available.
Authors
T.M. Powell, S. Willmot, J. D. Murray, V. S. Manoranjan, J. E. Cloern
Using side scan sonar data in a geographic information system to locate and display lake trout spawning habitat in the Great Lakes Using side scan sonar data in a geographic information system to locate and display lake trout spawning habitat in the Great Lakes
The National Fisheries Research Center-Great Lakes of the U.S. Fish and Wildlife Service has extensively used a side scan sonar to survey and pinpoint lake trout spawning grounds in the Great Lakes. The Geographic Information System (GIS) of the National Ecology Research Center produced maps from the side scan sonar data showing the exact location of the spawning grounds; this will...
Authors
Charles L. Brown, Thomas A. Edsall, Robert G. Waltermire, Barbara White
Landsat-assisted vegetation mapping of Innoko National Wildlife Refuge, Alaska Landsat-assisted vegetation mapping of Innoko National Wildlife Refuge, Alaska
No abstract available.
Authors
Stephen S. Talbot, Carl Markon
Methods and applications in surface depression analysis Methods and applications in surface depression analysis
Gridded surface data sets are often incorporated into digital data bases, but extracting information from the data sets requires specialized raster processing techniques different from those historically used on remotely sensed and thematic data. Frequently, the information desired of a gridded surface is directly related to the topologic peaks and pits of the surface. A method for...
Authors
Susan K. Jenson, Charles M. Trautwein
Trip C; Structure and stratigraphy above, below, and within the Taconic unconformity, southeastern New York Trip C; Structure and stratigraphy above, below, and within the Taconic unconformity, southeastern New York
No abstract available.
Authors
Jack B. Epstein, Peter T. Lyttle
An algorithm for locating candidate labelling boxes within a polygon An algorithm for locating candidate labelling boxes within a polygon
Vector-based geographic information systems usually require annotation, such as a polygon number or attribute data, in a suitable location within a polygon. Traditional methods usually compute the polygon centroid, test the centroid for inclusion or exclusion, and select some alternative point when the centroid falls outside the polygon. Two problems are associated with this approach: (1...
Authors
Jan W. van Roessel