COASTAL EROSION CAUSED BY CONSTRUCTION OF AN ARTIFICIAL ISLAND AND PERFORMANCE OF BEACH NOURISHMENT

Ryuichi Nishi, Takaaki Uda, Michio Sato, Masakazu Wakita, Yasuro Ohtani, Takahiro Horiguchi

Abstract


It is well known that the littoral drift carries much sand into a sheltered area caused by the presence of coastal structures such as detached breakwaters. As a result, the shoreline in the sheltered area advances, whereas the shoreline of the neighboring coast recedes to balance a sand budget of the coast. An artificial island for storage of crude oil was constructed off the Kashiwabara coast, Shibushi, Kagoshima Prefecture, Japan since 1985. The island has a rectangular shape roughly 1.5 km long and 1.5 km wide. This paper describes coastal processes related to the construction of the artificial island, and proposes a new dredging and beach fill scheme including a groin to decrease the coastal erosion due to the sheltering effect by the artificial island.

Keywords


beach nourishment; erosion; artificial island

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