DISCUSSION ON THE RELATIONSHIP BETWEEN CORAL DISTRIBUTION CHARACTERISTICS AND THE PHYSICAL ENVIRONMENT IN HOLLOW CUBE BLOCK TYPE ARTIFICIAL REEF

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  • 中空ブロック型人工リーフでのサンゴ分布特性と物理環境要因の関係に関する考察

Abstract

<p> Artificial reefs have been evaluated as facilities which can provide disaster prevention functions while minimizing environmental impacts, but there have been few cases where artificial reefs have been expected to actively create a favorable environment. The artificial reef at Hamasaki Coast in Motobu Town, Okinawa, has been shown to have much better coral establishment and growth conditions than surrounding artificial structures. However, much remains to be learned about the relationship between growth conditions and physical environment. The purpose of this study is to discuss the relationship between coral distribution characteristics and the physical environment of current, water quality and sediment by conducting field surveys on the artificial reef at Hamasaki Coast, and to identify desirable environmental factors for coral growth. An analysis of the relationship between flow conditions, sediment volume, and coral distribution showed that coral growth is related to the creation of an environment in which suspended sediment is difficult to accumulate due to fast currents during low and high tides.</p>

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