Abstract
Relation between protection of coastal forest and coastal erosion was investigated, taking Nakamurahama beach in Niigata Prefecture as the example. On this beach coastal forest was excessively expanded close to the shoreline and earth dike was built to protect coastal forest itself against wind-blown sand in winter. The amount of 88% of all the narrowing of natural sand dune was caused by this activity and the rest of 12% was due to the shoreline recession by erosion. Thus, this natural beach has been rapidly altered to artificial coastline armored with concrete revetment. In order to change the situation, overall land management is required instead of local optimization by sector-by-sector activities.
