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Propagation of surge waves in channels with large-scale bank roughness

Author(s): Tobias Meile; Jean-Louis Boillat; Anton J. Schleiss

Linked Author(s): jean-louis boillat, Anton J. Schleiss

Keywords: Flow resistance; hydraulic model; macro-roughness; surge wave experiment; unsteady channel flow

Abstract: Surge waves from upstream have been studied systematically in a 40 m long channel. Its banks were equipped with large-scale rectangular roughness elements. In addition to a prismatic reference channel, 41 different configurations of rectangular bank cavities have been investigated. The purpose was to study the effect of large-scale bank roughness on steady and unsteady flows. The macro-roughness of the channel banks increases the flow resistance. Consequently, the absolute celerity of the surge wave front is also reduced by between 5 and 25%. Based on the concept of an effective channel width for the computation of the mean flow velocity, the relative celerity of the surge wave can be predicted for macro-rough channel configurations. The attenuation of the wave front height is increased by the macro-rough flow resistance as well as by the partial reflections of the surge waves in the cavities and passive retention of the latter.

DOI: https://doi.org/10.1080/00221686.2012.738876

Year: 2013

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