IMPROVEMENT OF WATERFRONT FUNCTION OF GENTLY SLOPING REVETMENT BY GRAVEL NOURISHMENT AND GROINS

The gently sloping revetment is stable when its toe is buried beneath a sandy beach. However, when the toe is exposed to waves as a result of beach erosion, fill material under the revetment is drawn out through the gap between the toe and the sandy beach, resulting in damage to the entire structure. Furthermore, when the toe of the revetment is exposed to waves, the revetment surface tends to be slippery because of the attachment of marine organisms, increasing the danger of the falling from the steps. In this study, the improvement of the waterfront function of the gently sloping revetment using gravel nourishment and groins was investigated, taking Kemigawa Beach in Tokyo Bay as an example. For this purpose, numerical simulations were carried out using the BG model.