Incipient motion of sediment in rectangular open-channel flow with a submerged rigid vegetation zone

Xue, W. and Wu, S. and Wu, X. and Zhou, J. and Dai, J. (2016) Incipient motion of sediment in rectangular open-channel flow with a submerged rigid vegetation zone. In: ICSE 2016 (8th International Conference on Scour and Erosion), 12-15 September 2016, Oxford, UK.

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Abstract

An experimental statistical method is here developed to investigate the incipient motion in open channel blocked with an artificial submerged rigid vegetation patch. We focus on the effects of vegetation elements on the incipient motion of sediment and the scour around the vegetation elements. The incipient motion of sediment is divided into three processes, the static, the partially motion, and the entirely motion, and the third process is defined as the criterion for incipient motion of sediment. Based on the experimental results, a semi-empirical equation for the sediment incipient velocity in the presence of submerged vegetation is derived, which is observed to be smaller than that without vegetation. A strong linear relationship between the average depth of the scour holes around the vegetation elements and the flow velocity is found.

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