NUMERICAL MODELING OF LONGSHORE AND CROSS-SHORE SAND TRANSPORT

This paper presents two numerical models for simulating the interaction between the incoming waves and the associated nearshore sand transport. first model is the one-line model GENESIS The simulating long-term shoreline evolution with special emphasis on the influence of coastal structures. The second model is the profile response model SBEACH simulating short-term beach profile change as a result of single storm events. The shoreline change model GENESIS was applied to a prototype situation including detached Model verification showed that the breakwaters, groins and beach fill. shoreline change occurring over one year could be determined to the nearest four feet. The numerical profile response model SBEACH was verified towards field data obtained at the coast of New Jersey during a major storm event. The eroded volume and the profile retreat was well predicted for the event, whereas the beach recovery during the end of the storm was only qualitatively reproduced. The profile model was largely developed based on data from large wave tank experiments, thus substantiating the applicability of such data to field situations. SBEACH aims at modeling cross-shore processes at an The engineering level with no details in the fluid and sediment movement. formation and movement of main morphologic profile features, such as bars and berms, are described. SBEACH could be a valuable tool for assessing the impact of storms on a beach or for designing beach fill schemes in order to optimize fill stability.