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Analysis of submerging characteristics and stability of the model submersible fish cage operated by buoyancy control

부력 제어식 가두리 모형의 부침 특성 및 안정성 해석

  • Lee, Gun-Ho (Aquaculture Industry Division, West Sea Fisheries Research Institude, NFRDI) ;
  • Cha, Bong-Jin (Fisheries Engineering Division, NFRDI) ;
  • Jeong, Seong-Jae (Aquaculture Industry Division, East Sea Fisheries Research Institude, NFRDI)
  • 이건호 (국립수산과학원 서해수산연구소 해역산업과) ;
  • 차봉진 (국립수산과학원 시스템공학과) ;
  • 정성재 (국립수산과학원 동해수산연구소 해역산업과)
  • Received : 2011.09.15
  • Accepted : 2012.02.08
  • Published : 2012.02.28

Abstract

This study aims to analyze the performance of a submersible fish cage which was designed for developing an economical cage system can be applied in korean aquaculture environment easily. To analyze the performance of the designed cage a model test was carried out. In the test, inclination changes of the upper frame and mooring tensions of model cage were measured during the submerging and surfacing motion in still water and wave condition (period: 2s, wave height: 0.1, 0.2, 0.3m). As a result, in the still water condition the model cage kept horizontal balance and inclination degree of the upper frame was about $1^{\circ}$. In the wave condition, the model cage showed bilateral symmetric up-and-down motion but the average inclination degree of the upper frame was about $0^{\circ}$. When the model cage reached at a depth of 1m, the up-and-down motion of the cage was decreased by 12% compared with that of at the surface (period 2s, height 0.3m). In the same wave condition, the maximum and average line tension under the bottom position were about 8% and 11% respectively compared with that of at surface.

Keywords

Submersible fish cage;Surfacing and Submerging;Variable ballast;Model cage;Mooring load

Acknowledgement

Supported by : 국립수산과학원

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