| Summary: | 碩士 === 國立臺灣海洋大學 === 海洋環境資訊系 === 102 === This study investigated rapid growth waves occurred in the sea off the Liouciou Island by analyzing the wave information obtained by the wave buoy data deployed by the Central Weather Bureau. The rapid growth waves were defined as waves with significant wave height not only increased more than two times and also grew to higher than 1.5 m in 6 hours.
It was found that between 2004 and 2012, there were 117 incidents of rapid growth waves. Their occurrence was mostly associated with the nearby typhoons. There were some events caused by continental high pressure systems and weather fronts. The severity, such as wave height, wave period and duration of the event, was higher for the events associated with typhoon. We also investigated the relationship between the local wind and the wave height during the rapid wave growth period. It was found that the correlation coefficient between the amounts of wave increase and that of wind speed was only 0.46. However, the correlation coefficient between the maximum wave height and maximum wind speed during the growth event was 0.66.
This study also compared the rapid growth wave events occurred in the sea off Longdon and Penhu. Results showed that the rapid growth wave events in the latter two location were mostly caused by continental cold and front systems, different from the event occurred in the sea near Liouciou Island. The yearly average number of event occurred in the sea off Penghu was the highest among the three locations. Pengu had 82 events per year on average, while Longdon 45 and Liouciou Island only 13.
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