Journal of the Korean Society of Fisheries and Ocean Technology (수산해양기술연구)

The Korean Society of Fisheries and Ocean Technology (한국수산해양기술학회)
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The opening efficiency difference of guide net in finless porpoise escape device by the type of extension net in stow net

안강망의 그물 구성에 따른 상괭이 탈출 유도망의 전개 성능 차이

  • LEE, Gun-Ho (Fisheries resources and Environment Division, West Sea Fisheries Research Institute, National Institute of Fisheries Science) ;
  • KIM, Hyun-Young (Fisheries resources and Environment Division, West Sea Fisheries Research Institute, National Institute of Fisheries Science) ;
  • SONG, Dae-Ho (Fisheries resources and Environment Division, West Sea Fisheries Research Institute, National Institute of Fisheries Science)
  • 이건호 (국립수산과학원 서해수산연구소 자원환경과) ;
  • 김현영 (국립수산과학원 서해수산연구소 자원환경과) ;
  • 송대호 (국립수산과학원 서해수산연구소 자원환경과)
  • Received : 2021.11.01
  • Accepted : 2021.11.25
  • Published : 2021.11.30
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Abstract

This study aims to understand the opening efficiency of the finless porpoise escape guide net by the type of extension net that is the part to which the escape guide net is attached in stow net. To this end, extension nets were manufactured in full size and the net mouth area and towing tension were investigated according to the towing speed (0.2, 0.4, 0.6 and 0.8 m/s) and the type of extension net (25 mm net and raschel net) in the water tank. As a result, the net mouth area of the guide net was larger when the raschel net was used for the extension net than when the 25 mm net was used under all towing speeds. In addition, regardless of the type of extension net, the net mouth area reached about 80% of the maximum value at a towing speed of 0.4 m/s. In the field, fishing operation of stow net is performed only when the current speed is above 0.4 m/s. Therefore, the speed of 0.4 m/s was confirmed as a meaningful value to determine whether it is possible to operate. As a result of analyzing the relationship between the net mouth area of the guide net and the towing tension, it was confirmed that the difference in the net mouth area of the guide net according to the type of the extension net was due to the difference in the solidity ratio.

Keywords

Acknowledgement

이 논문은 2021년도 국립수산과학원 수산과학연구사업(R2021043)의 지원으로 수행된 연구이며 연구비 지원에 감사드립니다.

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