Freakish sea index and sea states during ship accidents |
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Authors: | Takuji Waseda Hitoshi Tamura Takeshi Kinoshita |
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Institution: | 1. Department of Ocean Technology Policy and Environment, The University of Tokyo, 5-1-5 Kashiwano-ha, Kashiwa, Chiba, 277-8563, Japan 2. Research Institute for Global Change, Japan Agency for Marine-Earth Science and Technology, 3173-25 Showa-machi, Kanazawa-ku, Yokohama, Kanagawa, 236-0001, Japan 3. Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo, 153-8505, Japan
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Abstract: | Sea states during seven marine accidents near Japan reported in the media were analyzed using a third-generation wave model. Based on the estimated evolution of the directional wave spectrum, a narrowing of the directional spectrum was suggested for five cases. Based on earlier studies in laboratory tanks, the narrowing of the directional spectrum may be associated with increased probability of freak waves at the time of the accident. A diagram mapping the frequency bandwidth and directional spread proved useful as a diagnostic tool. This freakish sea index was compared against recently conducted ocean wave observations. The accident causes are discussed in the context of slamming, green sea loading, loss of stability, broaching and other possibilities. |
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