碩士 / 國立臺灣海洋大學 / 海洋環境資訊學系 / 101 / This study investigates the rapid growth wave events occurred at the sea off the Hualien coast by analyzing the wave and meteorological information recorded by the Central Weather Bureau’s Hualien wave buoy. In this study, 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. Based on these events, the present study explored the metrological factors associated with these events. Furthermore this paper also study the differences between the rapid growth wave events occurred in the Longdong , Shinchu and Hualien area.
The results showed that 70% of the rapid growth wave events have occurred in the winter and spring seasons, 19% in the fall. It was found that during the fall, winter and spring seasons the rapid growth wave events were related to the passage of meteorological front and continental high pressure. In the summer, the rapid growth wave events were always caused by typhoons or tropical depressions.
The results also show that the significant wave height and wave period decreased slightly before the start of the wave growth event, and after that the wave height and period increased significantly. In addition, the wind speed also grew during the rapid growth period. The maximum wind speed averaged among all events was about twice that the wind speed averaged over the whole observation period. Moreover, it was found that about 2 hours before the start of the wave growth event, the wind direction changed from WS to NE. The atmospheric pressure showed no significant changes during the rapid growth wave event.
Finally, this study compared the rapid growth wave events found near the Longdon and Shinchu coasts with that from Hualien. It was found that for the same metrological system the average ratios between the maximum wave height at the end of growth event to that at the start were 5.2 in Longdon, 4.7 in Shinchu, and 4.2 in Hualien.
| Identifer | oai:union.ndltd.org:TW/101NTOU5276030 |
| Date | January 2013 |
| Creators | Chun-Chu Lu, 呂春珠 |
| Contributors | Cheng-Han Tsai, Jen-Chih 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 | 83 |
Page generated in 0.002 seconds