A Study on the Limit of Anchor Dragging for Ship at Anchor(Ⅰ)

Lee, Yun-Sok; Jung, Yun-Chul; Kim, Se-Won; Yun, Jong-Hwui; Bae, Suk-Han; Nguyen, Phung-Hung

Journal of Navigation and Port Research 2005;29(5):357-363.
Published online June 30, 2005.

묘박 중인 선박의 주묘 한계에 관한 연구(Ⅰ)

이윤석, 정연철, 김세원, 윤종휘, 배석한, 구엔풍

A Study on the Limit of Anchor Dragging for Ship at Anchor(Ⅰ)

Yun-Sok Lee, Yun-Chul Jung, Se-Won Kim, Jong-Hwui Yun, Suk-Han Bae, Phung-Hung Nguyen

Abstract

When typhoon approaches, ship normally drops her anchor at proper anchorage for sheltering. If an anchored ship is under the influence of typhoon, she am keep her position when the external force and counter force is balanced. Where, external force is induced by wind, wave and tidal currents while counter force is induced by holding power of anchor/chain and thrust force of main engine. In this study, authors presented a method to analyze theoretically the limit of external force for the ship to keep her position without being dragged and, to check the validity of the method, applied this to the ship which had been anchored in Jinhae Bay when the typhoon MAEMI passed on September 2003.

Key Words: Marine accident;Anchoring stability;External force;Counter force;Holding power