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http://dx.doi.org/10.7837/kosomes.2021.27.4.474

Minimum Wind Speed of Dragging Anchor for Ships in Jinhae Bay Typhoon Refuge  

Kang, Byung-Sun (Graduate School of Mokpo National Maritime University)
Jung, Chang-Hyun (Mokpo National Maritime University)
Park, Young-Soo (Korea Maritime and Ocean University)
Kong, Gil-Young (Korea Maritime and Ocean University)
Publication Information
Journal of the Korean Society of Marine Environment & Safety / v.27, no.4, 2021 , pp. 474-482 More about this Journal
Abstract
An average of two to three typhoons that occur in the Philippines or Taiwan pass through Korea each year owing to the influence of the geographical location and western winds. Because Jinhae Bay is known as Korea's representative typhoon refuge, it is filled with ships during typhoons and later becomes saturated with ships anchored to the surrounding routes. If a strong wind drags an anchored ship, a collision accident may occur because of the short distance between the ships. Therefore, a systematic anchoring safety management of Jinhae Bay is required. In this study, the minimum wind speeds of a dragging anchor based on the water depths of Jinhae Bay anchorages were investigated. When 7-9 shackles were given, the minimum wind speeds were 48-63, 46-61, and 39-54 knots at depths of 20, 35, and 50 m, respectively. As the water depth increased, the length of the cable laid on the sea bed became shorter than 5 m owing to the external force, and the minimum wind speed showed a significant difference of 4-8 knots. In addition, ships with high holding power anchors (AC-14 type) had higher minimum wind speeds than ships with conventional anchors (ASS type). Finally, it was confirmed that at a depth of 50 m, dragging easily occurred even when a high holding power anchor was applied.
Keywords
Typhoons; Jinhae Bay; Ships anchored; Collision accident; Safety management; Minimum wind speed;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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