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

The Korean Society of Fisheries and Ocean Technology (한국수산해양기술학회)
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Characteristic of holding power due to nature of seabed at anchor

묘박중 해저 저질에 따른 파주력 특성

  • KIM, Byung-Yeob (College of Ocean Sciences, Jeju National University) ;
  • KIM, Kwang-il (College of Ocean Sciences, Jeju National University) ;
  • KIM, Min-son (Marine Production System Major, Kunsan National University) ;
  • NOBUO, Kimura (Faculty of Fisheries Sciences, Hokkaido University) ;
  • LEE, Chang-Heon (College of Ocean Sciences, Jeju National University)
  • 김병엽 (제주대학교 해양산업경찰학과) ;
  • 김광일 (제주대학교 해양산업경찰학과) ;
  • 김민선 (군산대학교 해양생산시스템전공) ;
  • ;
  • 이창헌 (제주대학교 해양산업경찰학과)
  • Received : 2022.06.03
  • Accepted : 2022.08.19
  • Published : 2022.08.31
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Abstract

In general, a high tension on the anchor and chain is placed when a ship at anchor is subjected to heavy weather. Mariners have to pay attention to whether dragging anchor occurs to keep the safety of the ship at anchorage since it is difficult to maintain the stable motion of ship and it causes collisions with other ships nearby. In this paper, the ship motion against the external forces was shown to obtain the fundamental data about characteristic of holding power due to nature of seabed at anchor, so practical trials were carried out in rocky area and muddy area using a trial ship around coastal area of South Korea. In muddy seabed, holding power showed reasonable tension values depending on the distance from anchor position of continuing swing motions of a ship corresponding to wind force. Meanwhile in rocky seabed, tension values on the chain appeared very high occasionally regardless of the distance from the anchor position and seemed to exceed its holding power to be the breaking strain of the chain although weather was not in a severe condition. Therefore, some of the cables laid on the seabed were presumed to be caught in a crack on the rock. It is assumed that even a small amount of external force may cause the chain to break in a moment in rocky seabed. Additionally, wind and current forces had a somewhat contradictory effect on holding power of the ship between them.

Keywords

Acknowledgement

이 논문은 2022학년도 제주대학교 교원성과지원사업에 의하여 연구되었음.

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