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BEACH CHANGES IN ODAIBA COASTAL PARK AND SHORE PROTECTION

Beach changes of the artificial beach made in Odaiba Coastal Park of Tokyo located deep in Tokyo Port were investigated by field observations. The shoreline of this artificial beach was made in a L-shape due to the limitation of land usage in the park and predominant waves are incident obliquely at a large angle at one part of the beach. This causes shoreline recession at that site due to the action of longshore sand transport toward the inner side of the bay beaches. Shore protection using seawall made of wood was adopted, but beach erosion advanced to fail this seawall. Some measures to solve further beach changes were proposed and compared.