Abstract

Coral cays may be formed by the high waves in about several days. If the initial formation mechanism of coral cays can be understood, it will be useful for protection, the environmental preservation, and use of the coral reef seashore. Moreover, it can contribute also to protection of islands in Japan and the Pacific Ocean archipelagic country where the sea level rise due to global warming may result in submersion. In the past research, the formation mechanism of coral cays is performed by 2-dimensional tests. But, it includes neither the influence of 3-dimensional wave and current which were caused by waves equipped with open sea, nor the influence of a steep slope reef. In this paper, 3-dimensional hydraulic movable bed model tests were conducted to clarify the coral cays formation process.

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