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Observation analysis of wave climate in surrounding waters of Ryukyu Islands

ZHENG Chongwei;LI Xunqiang;LI Chongyin;Dalian Naval Academy;College of Meteorology and Oceanography,PLA Univ.of Sci.& Tech.;Institute of Atmospheric Physics,Chinese Academy of Sciences;  
To exhibit the characteristics of wave field in the surrounding waters of Ryukyu Kingdom and adjacent waters,the wave climate,especially the(strong)wind direction occurrence and(strong)wave direction occurrence,was analyzed based on the climatic statistics methods,using the buoy observation data from 2stations,with the following results.The peak value of significant wave height(SWH)in the Kiyanmisaki waters appears in August(1.5m),while in February(1.7m)in station 22001.The wave period in these two stations is 6.0~8.5sin each month.The peak value of wave period appears in October,while the trough appears in May and June.The station 22101 can represent the Ryukyu Kingdom and adjacent waters better in ocean wave.The single peak value of maximum wave height in Ryukyu Kingdom and adjacent waters appears in August to October(about 12 min station 22001 and 8~10min Kiyanmisaki).The peak value of average maximum wave height appears in August(6.0m).Extreme wave height with return period of 50 years has a significant monthly variation.The peak value in station 22001 appears in August to September(22-24m),while in June to October in Kiyanmisaki(16~20m).In February and November,the high occurrence of unite-occurrence of wave height and wave period in the Ryukyu kingdom waters is(2.0m,7s),while in May is(1.0m,7~9s),in August is(1.0m,7s).Miyako Strait:In February,May and November,the strong wave mainly comes from NNE direction.In August,the strong wave mainly comes from ESE direction.There is a good consistency between the wind direction occurrence and the wave direction occurrence.
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