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Experimental Investigation of Light Particles Transport in a Tidal Bore Generated in a Flume

Author(s): L. Thomas; W. Reichl; Y. Devaux; A. Beaudouin; L. David

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Tidal bores are natural flows that can have a strong impact on river ecosystems. Recently, there has been a regain of interest in this flow, for example in China. Many in-situ measurement campaigns have been performed, but they are very limited concerning the spatial resolution. Studies in the lab inside flumes, although questionable concerning their similitude to real tidal bores, can give new insights to understand the impact of such phenomena on the river sediments. In this study, optical measurement techniques (stereo-PIV and PTV coupled) are used to add some understanding of the influence of moving bores on the sediment transport. Four Froude numbers are investigated. The trajectories and their stability are observed, and it is shown that for undular bores, the impact on the trajectories is weak, while strong effects are observed in the breaking bore case.


Year: 2016

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