SAND TRANSPORT OVER RIPPLED BEDS IN OSCILLATORY FLOW

摘要

This paper summarizes the main results from a recently completed Ph.D. research aimed at a better understanding and modeling of the interaction processes between the wave-induced oscillatory flow, the ripples and the sand transport on the basis of new full-scale experiments. The new detailed measurements above 'natural', mobile ripples generated by full-scale asymmetric oscillatory flows reveal the importance of the formation and ejection of vortices on the flow velocities and the suspended sand dynamics. The new net sand transport data are used to assess existing practical sand transport models and to develop a new and better practical model to predict the net sand transport over rippled beds in oscillatory flows.