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

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Abstract

人工魚礁は全国的に多くの海域で、小規模な人工魚礁から大規模なものまで、それぞれの目的により多数設置されている。しかし、実際の計測結果に基づいたそれらの設置精度に関する報告は少なく、設置目的、利用効率等の評価の基礎は十分に得られているとは考え難い。そこで、長門海域に1984~1987年の間に設置された、13カ所の群体礁の設置状況を1991年10月4日の間、サイドスキャンソナーおよび魚探機を用いて計測した。位置計測機器は構成礁設置時に用いられ、急激な位置変動が少ない事からロランCを用いた。計測された各群体礁の

In spite of a widely accepted trend of settling large-scaled artificial reef groups, the structure of the actuallysettled 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 the13 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 presentpurpose, as supported by the fact that as many as 95% of the component reefs could be detected by sailing at3.5 knots along parallel courses of 200m intervals.Most of the component reefs in the circle type groups were found within the planned range, while theaberration of their settled positions in the pseudo-ellipse type reef groups was mainly due to that of center blockssettled by hanging methods basing on the indication from Loran C.

Journal

  • Journal of Fisheries Engineering

    Journal of Fisheries Engineering 32(1), 13-22, 1995-07-31

    The Japanese Society of Fisheries Engineering

References:  13

Codes

  • NII Article ID (NAID)
    10008438557
  • NII NACSIS-CAT ID (NCID)
    AN10278554
  • Text Lang
    JPN
  • Article Type
    ART
  • ISSN
    09167617
  • Data Source
    CJP  J-STAGE  JASI 
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