Performances of Hydraulics and Bedload Sediment Flushing in Rigid Channel Using Surge Flows
Publication: Journal of Irrigation and Drainage Engineering
Volume 132, Issue 2
Abstract
This paper presents an investigation of the performance of the hydraulic and sediment removal of a flushing system in a detention basin. A hydraulic criterion for the design of the flushing system is proposed. An equation for the maximum height of the flushing wave front as a function of the distance from the gate, the initial water depth in the chamber, and the chamber length is proposed. The Lauber and Hager equation for the maximum velocity of a flushing wave is also verified. Effective removal of sediment particles on the bed is a direct function of the bed shear stress generated by the flushing flow. This study reveals that the bed shear stress on the channel bed induced by the flushing flow can be attributed to the hydrostatic pressure, the flow acceleration, and the convection-induced momentum. The shear stress associated with fluid distortion and the turbulent viscosity may be neglected. Significant error would occur if the hydrostatic pressure component were used as an estimate of the bed shear stress on a mild slope channel. The energy slope method may provide an overestimate of the bed shear stress. Finally, an appropriate equation to evaluate the maximum bed shear stress is proposed.
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Acknowledgments
The writers would like to acknowledge the assistance of Dr. S-Y. Lim and Mr. M-C. Ong and would like to thank Professor W. H. Hager for sending us his publications.
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Published In
Journal of Irrigation and Drainage Engineering
Volume 132 • Issue 2 • April 2006
Pages: 171 - 179
Copyright
© 2006 ASCE.
History
Received: May 20, 2004
Accepted: Apr 25, 2005
Published online: Apr 1, 2006
Published in print: Apr 2006
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