Swash Dynamics Under Obliquely Incident Waves

摘要

A quantitative understanding of swash hydrodynamics and sediment transport onbeaches under obliquely incident waves is essential for the design of shoreline erosion mitigation measures such as sand bypassing and beach nourishment. Field and laboratory measurements on the distribution of longshore sediment transport across the surf zone indicated that the distribution was generally bimodal with peaks in the swash and breaker zones (e.g., Bodge and Dean 1987; Kamphuis 1991). Hodge and Dean (1987) observed that the relative significance of the peaks shifted from the breaker zone peak to the swash zone peak as the surf varied from spilling to collapsing conditions. They found that longshore sediment transport in the swash zone might account for at least 5% to over 60% of the total drift. Knowledge of longshore sediment transport in the swash zone is important for the design of a sand bypassing system such as the system based on a jet pump deployed in the swash zone at Indian River Inlet. Delaware (Clausner et al. 1991).