Abstract
The development of a cuspate foreland on a steep coast with abrupt change in coastline orientation was investigated by a movable bed experiment. After 8-hour wave generation, a groin was installed at the cuspate foreland and the effect of obstructing continuous longshore sand transport was also experimentally investigated. The results of the experiment were reproduced using the BG model which was proposed by the present authors. The beach changes around the cuspate foreland were successfully predicted. The experimental and numerical results were in good agreement. The installation of a detached breakwater on a steep coast with abrupt change in coastline orientation was also predicted using the model and both results were compared.
