碩士 / 國立中央大學 / 水文與海洋科學研究所 / 103 / In this study, two topics are discussed. The first topic is the theory validation of Tsunami Reverse Tracing Method (TRTM) and the study of the possible sources of the coral boulders in Lanyu. The second topic is the 3-D simulation of landslide generated tsunami and its application to the reconstruction of the 1867 Keelung tsunami event.
TRTM is established based on the linear hypothesis, and validated to accord with superposition principle (Kramers, 1957) and Huygens-Fresnel principle (Fresnel and Chim, 1816). Recently, six sites of coral boulders have been founded on Lanyu, Taiwan. According to the radiometric dating results, the ages of the boulders are between ca.6000 years BP and ca.200 years BP. The youngest boulder was suggested to be related to the 1771 Yaeyama earthquake event (Ota et al., 2014). Hence, we implemented the Tsunami Reverse Tracing Method (TRTM) to find the possible tsunami sources and solve the linear shallow water equation by COMCOT (Cornell Multi-grid Coupled Tsunami Model) tsunami model to perform the scenario analysis.
In the past, the 1867 Keelung tsunami event was studied by the TRTM, and the Impact Intensity Analysis (IIA) method was employed to quantify the tsunami impact from each discretized computational domain. The result showed that three possible landslide scenarios of the 1867 Keelung tsunami event were triggered in the Mein-Hwa Canyon, Keelung sea valley, and Keelung Shelf (Lee, 2014). In this study, we use a 3D fluid-solid coupling model, SPLASH3D to combine the Moving Solid Method (MSM) to validate and simulate the case of submarine slides. According to Watts et al. (2005), the Submarine Mass Failure (SMF) was categorized into Slides and Slumps. The result indicates that the impact of the initial maximum negative wave is effected by the initial location and volume of the SMF.
For the coral boulders of Lanyu, the scenario set up in southern Green Island is agreeable with the site of boulders. It seems unlikely that the boulders are related to the 1771 Yaeyama earthquake event because of the weak signal of the numerical wave gauges. The results show that the possible landslide scenarios of the 1867 Keelung tsunami event occurred along the Keelung sea valley. The wave height higher than 6.5 m in Keelung coastal is observed in this study.
| Identifer | oai:union.ndltd.org:TW/103NCU05761002 |
| Date | January 2015 |
| Creators | Pei-Yu Li, 李珮瑜 |
| Contributors | Tso-Ren Wu, 吳祚任 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 163 |
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