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Title: Model study of Trotters Shoals spillway : hydraulic model investigation
Authors: United States. Army. Corps of Engineers. Savannah District.
Fletcher, Bobby P.
Grace, John L.
Keywords: Energy dissipaters
Hydraulic models
Hydraulic structures
Stilling basins
Trotters Shoals Dam
Publisher: Hydraulics Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Technical report (U.S. Army Engineer Waterways Experiment Station) ; H-73-7.
Description: Technical Report
Abstract: Tests of the spillway for the Trotters Shoals Dam were conducted on a 1:80-scale model to investigate flow conditions in the approach and exit channel and the performance of various elements of the structure. Particular emphasis was placed on the development of an energy dissipater that would provide satisfactory energy dissipation and exit channel flow conditions. Approach flow conditions were improved by revising the left abutment to prevent a severe drawdown of the water surface in the vicinity of the left abutment. The model indicated that, after the left abutment was modified, the spillway capacity was equal to that computed. Nappe separation from the downstream quadrant of the crest was prevented by extending the crest piers upstream and shifting the gate slots downstream relative to their original positions. These modifications improved pressure conditions within the gate slots as well as along the spillway crest. Model tests indicated that the type 3 stilling basin provided more appropriate energy dissipation than the flip buckets and that it reduced the maximum velocities and the concentration of flow along the left side of the exit channel. Model tests were also conducted to investigate the instantaneous forces induced by the hydraulic jump that were exerted on the monoliths composing the left stilling basin wall. These instantaneous forces were measured electronically, and the measurements should provide information pertinent to the structural design of the stilling basin walls.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Technical Report

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