Advances in sediment transport under combined action of waves and currents

The coastal zone continuously changes due to natural processes and human activities.In order to understand and predict these morphological changes,an accurate description of sediment transport,caused by waves and currents(tidal or wave-induced),is important.This paper presents a review of the state-of-the-art knowledge in this field,including sediment incipient motion,bed forms,bed roughness,bed-load transport,suspended-load transport,equilibrium sediment concentration,and sheet flow.Some possible research fields and topics for future study also are proposed.