American Society of Civil Engineers


Lake Sharpe Sediment Flushing Analyses


by Martin J. Teal, (Project Manager, WEST Consultants, Inc., 11848 Bernardo Plaza Court, Suite 140B, San Diego, CA 92128) and John I. Remus, II, (Chief, Sedimentation and Channel Stabilization Section, U.S. Army Corps of Engineers, Omaha District, 215 N. 17th Street, Omaha, NE 68102)

pp. 1-8, (doi:  http://dx.doi.org/10.1061/40569(2001)140)

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Document type: Conference Proceeding Paper
Part of: Bridging the Gap: Meeting the World’s Water and Environmental Resources Challenges
Abstract: Sedimentation downstream of the confluence of the Bad and Missouri Rivers has increased water surface elevations near Pierre and Fort Pierre, South Dakota. Previous studies have confirmed that the increased water levels are due to a delta formation at the headwaters of Lake Sharpe. This paper presents the analyses of methods to increase sediment flushing, i.e., to move deposited sediments deeper into the reservoir. A calibrated and verified HEC-6T model is modified to assess the consequences of lowering pool elevations in Lake Sharpe. In addition, the existing model is modified to simulate, as much as possible, what effect the installation of a series of dikes would have on delta formation in the headwaters of the lake. The analyses make it apparent that lowering pool elevations is, in this case, more effective than Installing spur dikes in the headwaters of the reservoir. Lowering the pool elevation on the reservoir can significantly reduce the magnitude of the predicted increase in water surface elevations on the Missouri River over the simulation period. Spur dikes have a very localized effect, and augment the predicted increases in upstream water surface elevations.


ASCE Subject Headings:
Sediment
South Dakota
Missouri River
Dams