Abstract
There are various sand ripples in the natural world. The viewpoint of Yalin is that local disturbances result in laminar instability and in sand-ripple formation, namely, local disturbance→the instability of the laminar flow→the formation of sand ripples. Based on this viewpoint, a theoretical model of the resonant triad interaction and its nonlinear interaction with the sediment is established. The purpose of this model is to explain the formation and evolution of the sand-ripple and allow for analysis of the instability of open-channel flow caused by it and sand-ripple hydro-dynamic process. This model will not only pave a road to explore the mechanism of interaction between bed-form and turbulence, but also provide a good base for the study of aeolian sand-ripple formation.
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