Review of studies on the occurrence probability of freak waves based on the field data

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1 MARINE SCIENCE BULLETIN Vol. 32, No. 2 Apr P731.2 A Review of studies on the occurrence probability of freak waves based on the field data WANG Yao, ZHENG Jin-hai, TAO Ai-feng, CHEN Bo-tao (Key Laboratory of Coastal Disaster and Defence, Ministry of Education,College of Harbor Coastal and Offshore Engineering, Hohai University, Nanjing , China) Abstract In this paper, studies on the occurrence probability of freak waves based on the field data were reviewed. The field data and the corresponding characteristics of freak waves were compared and analyzed at first. Then, the progress of the studies on the occurrence probability of freak waves was commented, and the common questions in this area such as the disunity of the definition of freak waves were pointed out. At last, some ideas and suggestions were proposed for further study. Keywords freak waves; field data; occurrence probability Draper Akhmediev BK wyeureka@sina.com jhzheng@hhu.edu.cn 1

2 Campos 20 min Campos m Draupner 1 Hz min Pinho Agulhas /m Agulhas 2 Hz 20 min Liu Sand Draupner 1995 Queen Elizabeth II 20 Draupner 25.6 m 30 m s M/S m 18.4 m Norse Variant M/S Anita 14 Kjeldsen h Anita hz Thorn Bremen Caledonian Alwyn Star m /min 1968 World Glory 1980 Esso Languedoc 30 m 10 m 6~7 m m Lavrenov 1998 Mossel Marex 100 m

3 min Stansell Klinting Sand 1987 MVDerbyshire 295 m MVDerbyshire 0.65 Kjeldsen 1990 Yasuda 1997 JMS 2 H>2H s H H s Kharif m 1-2 km H>2H s Yura 3 km 1 43 m 1 1 Hz Mori H/H s>2 H>10 m / H/Hs>21 Hs>1 m CHIEN H 2H s Tseng H/H s 2 H/H s>2 H/H s>2 / H/Hs>2 H>10 m % 3.7 % 3.1 % % / / / / / %/ %

4 H/H s m 3.7% m H/H s > % 3.7 % <H/H s < m % 3 5

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