碩士 / 國立臺灣海洋大學 / 海洋環境資訊系 / 103 / Matsu Islands are an archipelago of 36 islands and islets located in the Taiwan Strait. Sea traffics are the main transportation link between the islands and beyond. Sudden changes of sea conditions pose threats to this sea link. This study investigated rapid growth waves occurred in the sea of this area by analyzing wave information obtained by the Matsu wave buoy between 2011 and 2014 deployed by the Central Weather Bureau. The rapid growth waves were defined as the waves with significant wave height not only increased more than two times but also grew to at least 1.5 m in 6 hours. It was found that in this time period there were 95 incidents of rapid growth waves.
The relationships between the meteorological conditions and the waves during the rapid growth period were also studied. It was found that a majority of the incidents of rapid growth waves occurred in the spring season, about 41% of the cases. And the main weather system associated with the rapid growth waves was the arrival of weather front followed by a cold continental high pressure.
The average wave height over all events increased from the start of the rapid growth and lasted 7 hours to reach its peak. By analyzing the wave period in the rapid growth events, it was found that the average wave period over all events decreased slightly at one hour before the start of the wave growth and then continued to increase up to 11 hours after the start of the event. It was also found that at the start of the growth the angle between the wind and wave directions started to decrease towards 40 degrees, indicating that the rapid growth waves were mainly due to local wind.
Comparison of the rapid growth events in Matsu with those in occurred Longdong in the northern coast of Taiwan showed the annually Matsu has fewer number of events than that in Longdon, about 26 versus 51. By examining the events occurred in both locations and under the influence of the same weather system, the results showed that Longdong events occurred about 4 to 6 hours after those occurred in Matsu. However, the events in Matsu lasted longer and had higher peak wave height. On the other hand, the events in Longdong had a higher ratio between the initial wave height and the peak wave height, since the initial wave height in Longdong is smaller than that in Matsu
| Identifer | oai:union.ndltd.org:TW/103NTOU5276012 |
| Date | January 2015 |
| Creators | Su, Chih-Chieh, 蘇志傑 |
| Contributors | Tasi, Cheng-Han, 蔡政翰 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 69 |
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