碩士 / 國立臺灣海洋大學 / 海洋環境資訊學系 / 101 / Sudden increase of wave height poses dangers to marine crafts. This study investigates the rapid growth wave events occurred at the sea off the Suao coast by analyzing data measured by the Suao data buoy. The rapid growth waves were defined as those waves with significant wave height not only increased more than two times and also grew to higher than 1.5 m in the time span of 6 hours.
From the buoy data measured between 2000 and 2012, the present paper identified 205 rapid growth wave events. It was found that there event mostly occurred in the spring and caused by the approach of weather front followed by continental high pressure. However, during the summer season these events were mainly caused by typhoons. The analysis showed that during the off-typhoon season the average wave height over all events increased from the start of the rapid growth and lasted 6 hours to reach the peak wave height. The average wave period showed a minimum at 2 hours after the start of rapid growth. It then increased until 6 hours after, and then continued to increase at a slower rate. The wind speed on average started to pick up two hours before the start of the wave growth, and peak wind speed appeared at 6 hours after. The average atmospheric pressure increased slightly during the growth event. As to the wind direction, before the growth event, the wind mostly came from the WNW direction, while after start of growth events the wind shifted to the direction between N and NW. On the other hand, for the events related to typhoons, wave height and wind speed continued to raise after the start of rapid growth events, while the atmospheric pressure started to decrease even before the start of rapid growth wave events. The wind direction varied without definite pattern. These phenomena obviously connected to the influence of typhoons.
Comparisons of rapid wave growth events occurred in Suao with those in Longdong showed that under the influence of the same weather system, the rapid growth events occurred in Longdong are mostly 2 hours before those found Suao. The average ratio of peak wave height to that at the beginning of the growth events for Suao was less that that for Longdong. Moreover, the mean peak wave height at the end of growth events for Suao was also less than that for Longdong.
Keywords: rapid growth wave,Winter high pressure, Meterorological front
| Identifer | oai:union.ndltd.org:TW/101NTOU5276036 |
| Date | January 2013 |
| Creators | 黃毓涵 |
| Contributors | Cheng-Han Tsai, Jen-Chin Tsai, 蔡政翰, 蔡仁智 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 96 |
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