サイドスキャンソナーによる大規模人工魚礁群の設置状況評価

DOI 日本農学文献記事索引 参考文献13件

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  • Evaluation of Settled Position of Component Reef Bｌocks in an Area with Some Large-Scaled Artificial Reef Groups Detected by Side Scan Sonar

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In spite of a widely accepted trend of settling large-scaled artificial reef groups, the structure of the actually settled ones is scarcely verified, because the suitable equipment was hardly available until recent. A survey by using highly sophisticated electronic devices was conducted in October 1991, off Nagato for the 13 groups of artificial reefs settled. And the following results were obtained : The side scan sonar (500kHz, 150m range each side) was proved to be very effective for the present purpose, as supported by the fact that as many as 95% of the component reefs could be detected by sailing at 3.5 knots along parallel courses of 200m intervals. Most of the component reefs in the circle type groups were found within the planned range, while the aberration of their settled positions in the pseudo-ellipse type reef groups was mainly due to that of center blocks settled by hanging methods basing on the indication from Loran C.

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