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

The Korean Society of Fisheries and Ocean Technology (한국수산해양기술학회)
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Structural stability analysis of jellyfish blocking net using numerical modeling

수치모델링을 활용한 해파리 차단 그물의 안정성 해석

  • LEE, Gun-Ho (Division of Fisheries Engineering Research, National Institute of Fisheries Science)
  • 이건호 (국립수산과학원 수산공학과)
  • Received : 2022.01.11
  • Accepted : 2022.02.15
  • Published : 2022.02.28
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Abstract

Damages by jellyfish are occurring frequently around the world. Among them, accidents caused by jellyfish stings are serious enough to cause death. So we designed a jellyfish blocking net and analyzed its stability to prevent sting caused by jellyfish entering the beach. To this end, the dynamic behavior of the jellyfish blocking net according to the current speed (0.25-1.0 m/s) and the net type (50, 100 and 150 mm) on the upper part of the blocking net was modeled using the mass spring model. As a result of simulations for the model, the horizontal tension (horizontal component of the mooring tension) of the mooring line increased with the decrease in the mesh size on the upper part of the blocking net at all current speeds, but exceeded the holding force at high tides faster than 0.5 m/s and exceeded the holding force at all current speeds at low tide. Therefore, the jellyfish blocking nets showed poor stability overall. The depth of the float line had a little difference according to the upper mesh size and increased lineary proportional to the current speed. However, the float line sank too much to block the incoming jellyfish. These analysis results helped us find ways to improve the stability of the jellyfish blocking net, such as adjusting the length of the mooring line and improving the holding power. Therefore, it is expected that this technology will be applied us various underwater structures to discover the weaknesses of the structures and contribute to increasing the stability in the future.

Keywords

Acknowledgement

이 논문은 2022년도 국립수산과학원 수산과학연구사업(R2022047)과 2014년 산업통상자원부 국민편익증진개발사업(과제명: 유영해양생물 해파리 대량발생에 따른 대국민 피해 저감 방안 개발)의 지원을 받아 수행되었으며, 연구(국민편익증진개발사업) 책임자로서 해파리 차단망 설계도를 제공해 주신 박성욱 님께 감사의 말씀을 전합니다.

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