Wall-Porosity Effects on Sediment Deposition and Scour at a Deflector Wall in an Alluvial Channel
Publication: Journal of Hydraulic Engineering
Volume 144, Issue 3
Abstract
Many water intakes and diversions are prone to blockage by drifting material, notably vegetation and ice. A way to avert blockage is by means of a deflector-wall and floating debris boom. However, the wall may be subject to local scour and cause bed sediment to accumulate at the intake or diversion entrance. This paper presents data and observations from live-bed, laboratory flume tests showing that a porous deflector wall reduces scour depth and height of sediment accumulation. The flume tests used deflector walls angled at 90° and 30° to the bank, as well as varying levels of wall porosity. A minimum value deflector-wall porosity of 50–75% is recommended for design. This range ensures minimal scour or accumulation of sediment at the wall and suitable wall performance as a deflector.
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Information
Published In
Journal of Hydraulic Engineering
Volume 144 • Issue 3 • March 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Jun 19, 2017
Accepted: Sep 13, 2017
Published online: Jan 6, 2018
Published in print: Mar 1, 2018
Discussion open until: Jun 6, 2018
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