Author(s): P. Sechet; B. Le Guennec

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Abstract: In this paper, we present the results of an experimental investigation aiming at understanding the interaction between near-wall coherent structures (or burst) and bedload transport in an open channel flow. This experiment associates Laser Doppler Anemometry measurements of the instantaneous velocity near the wall with real time measurement of sand particle trajectories on the smooth bed of a hydraulic flume. We will first give a description of the bursting phenomenon and we will present the experimental process. Then, we will give some details about the specific signal processing used in this work to detect coherent structures in the velocity signal. To conclude we will show that some characteristic scales of the particle motion are commensurate with those of the bursts.

DOI: https://doi.org/10.1080/00221689909498523

Year: 1999