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This work deals with a study of the suspended particles trajectories under standing waves above a fixed rippled bed. Sediment segregation is experimentally observed. It is characterized by different deposits zones for small and coarse particles. When the flow is damping, the small particles concentrate in localized narrow zones on the ripple crests. On the other hand, the coarse particles settle everywhere. A simple theoretical model is developed in order to explain the motion of small particles when the oscillatory flow is damping. We obtain a good agreement between results issued from the theoretical model and the experimental results.

Trajectoires de particules et tri sédimentaire sous l'action d'un écoulement oscillant au dessus d'un fond ridé