碩士 / 國立高雄海洋科技大學 / 海洋環境工程研究所 / 101 / This study, based on COMCOT (Cornell Multi-grid Coupled Tsunami Model) from Cornell University, tends to simulate tsunami run-up processes from offshore towards coastal region with a fixed bottom friction, accompanied with moment magnitude scale 7.0 earthquake. Tsunami generation is based on the theory from Mansinha & Smylie(1971) to estimate initial free surface displacement. The model domain consists of a constant depth offshore and a plane sloping beach with different slopes 1/25, 1/50 and 1/100, respectively. The main purposes of my research are to explore the effects of both the bottom slope and the crest/trough leading wave on the maximum run-up height. From simulated results, we can realize the crest/trough leading wave run-up and run-down motion on the different slopes and the variation of tsunami run-up height. Also, we tend to observe the wave evolution processes in the nearshore region.
The results reveal that wave speed reduced as it approaches the shore. This is because of tsunami is a shallow water wave and wave speed is proportional to the square root of water depth. The milder the slope, the higher the run-up. Trough leading wave generate higher run-up than crest leading wave. Both of the surface elevation for trough leading wave and crest leading wave are almost symmetrical. This may be come from a symmetrical wave from for the impinging waves. When tsunami reaches shoreline, part of the energy may propagate along the shore in the form of edge waves.
| Identifer | oai:union.ndltd.org:TW/101NKIMT282001 |
| Date | January 2013 |
| Creators | Li, Shu-Huei, 李淑惠 |
| Contributors | Chang, Kuo-Tung, 張國棟 |
| 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 |
Page generated in 0.7417 seconds