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Effect of flagpole attached to buoy on tension of buoy rope of gillnet

자망어구 부이의 깃대가 부이줄 장력에 미치는 영향

  • CHO, Sam-Kwang (Fisheries resources and environment Division, West Sea Fisheries Research Institute, National Institute of Fisheries Science) ;
  • LEE, Gun-Ho (Fisheries resources and environment Division, West Sea Fisheries Research Institute, National Institute of Fisheries Science) ;
  • CHA, Bong-Jin (Fisheries Engineering Division, National Institute of Fisheries Science) ;
  • JUNG, Seong-Jae (Fisheries Engineering Division, National Institute of Fisheries Science) ;
  • KIM, In-Ok (Fisheries Engineering Division, National Institute of Fisheries Science)
  • 조삼광 (국립수산과학원 서해수산연구소 자원환경과) ;
  • 이건호 (국립수산과학원 서해수산연구소 자원환경과) ;
  • 차봉진 (국립수산과학원 수산공학과) ;
  • 정성재 (국립수산과학원 수산공학과) ;
  • 김인옥 (국립수산과학원 수산공학과)
  • Received : 2016.10.31
  • Accepted : 2016.11.29
  • Published : 2016.11.30

Abstract

This study aims to reduce the force exerted to the buoy of the gillnet by wave and current. Five buoy models were selected for experiments and their rope tensions under wave and current action were compared. Five models were EL (ellipsoid), EL-H (ellipsoid-hole), SL (streamlined body), SP (sphere) and CL (cylinder, traditional type). In the first experiment, the Five models were tested without any attachment. In the second experiment, a flagpole was attached to each model. As a result, in the condition without flagpole, the tensions of four models with the exception of the CL were about a half of that of the CL. In the condition with flagpole, the tension of all models was twice larger than that without flagpole. Thus, a new model was suggested to improve the problem, which has a combined body that of a flagpole and a buoy Three new models of CL-L (long and thin cylinder), LF (leaf shape) and LF-F (leaf shape with fin) were designed. Also a cylinder type (CLD) with a flagpole as a control was included in the experiment. As a result, the LF-F had the smallest tension and a half tension of the CLD. Therefore, it is supposed that the flagpole and buoy combined model could reduce the tension on buoy rope and contribute to improve the gillnet loss problem.

Keywords

Fishing gear loss;Flagpole;Buoy;Gillnet;Wave;Current;Mooring tension

Acknowledgement

Supported by : 국립수산과학원

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