PRESENT SITUATION OF SEA-SAND MINING IN KYUSHU ISLAND, JAPAN AND ITS INFLUENCE ON COASTAL ENVIRONMENT

M. Hashida, N. Matsunaga, T. Komatsu

Abstract


The sea-sand mining has been carried out in the coast of western part of Japan since the early 1970's. Mined sea-sand is mainly used as fine aggregate of concrete structures. Mining a large amount of sea-sand near the coast induces the possibility of beach erosion and devastation of fishing grounds. In order to evaluate its influence on coastal environment, the present situation of sea-sand mining has been investigated in seven prefectures of Kyushu Island in Japan. The sea-sand mining in Kyushu Island is classified into two types. One is the mining in the sea areas where sea-sand reserves are limited. In these areas, the compatibility between the sea-sand mining and the protection of coastal environment will become very important in future. The other is the type that sea-sand has been supplied constantly from rivers or other sea areas. In this case, it will be the most important to keep the balance between the amount of mined sea-sand and that of supplied one.

Keywords


sand mining; Kyushu Island

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