Porous Plate Method: Reduction in Local Scour around Pier-Type Structures in Multidirectional Flows
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 149, Issue 2
Abstract
To reduce the local scour around pier-type structures, a “porous plate method” was proposed, aiming at effectiveness in multidirectional horizontal flows. The porous plates installed on the pier surface near the bed play two important roles in the reduction of the local scour. One is “breaking down or weakening” of the horseshoe vortex by a decline in vorticity. In the neighborhood (just upstream region), the local scour depth greatly decreases due to suppression of picking up sediment grains from the bed. Another is the resultant “flow regulation” in the boundary layer on the pier surface. In the downstream side, the wake separated from the pier surface behaves as “semi-homogeneous turbulence” without a Kármán vortex street, then the scour area drastically decreases.
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Acknowledgments
The authors would like to express our special thanks to Prof. Matsudaira, Tokyo Denki University, for his helpful assistance.
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© 2023 American Society of Civil Engineers.
History
Received: Jul 25, 2022
Accepted: Nov 19, 2022
Published online: Jan 10, 2023
Published in print: Mar 1, 2023
Discussion open until: Jun 10, 2023
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