碩士 / 國立中央大學 / 水文與海洋科學研究所 / 102 / This study was divided in two part, design a fast tsunami warning system and analysis the 1867 Keelung tsunami event. In first part, this study aims to develop reliable, fast, and low-cost system which is able to predict the tsunami wave height automatically based on the preliminary earthquake parameters. The Cornell Multi-grid Coupled Tsunami Model (COMCOT) was chosen as the kernel as it had been widely validated. The original source code has been parallelized by OpenMP to speed up the computing capability. We added a sophisticated source-scaling relationship proposed by Yen and Ma (2011) and a strike-dip trench database for generating tsunami source in the beginning stage of the tsunami event. A shell script was coded to execute the entire process automatically. We demonstrate the accuracy and performance by the 2011 Japan tsunami event. The warning products can be obtained in 3 minutes for a 10-hour simulation. In second part, this study uses a systematic method to analyse and reconstruct the 1867 Keelung event. The 1867 Keelung tsunami event is important to Taiwan because it indicates that three nuclear power plants nearby are under the threat of tsunami attack. Previous studies consider that this tsunami might be generated by an Mw7.0 earthquake along the Shanchiao Fault. However, there is no evidence showing the relationship between this mild seismic activities and the 7-m large tsunami wave height. We aimed to find out the potential tsunami source through the numerical analysis. Considering the steep bathymetry and intense volcanic activity along the Keelung coast, the tsunami might be triggered by not only an earthquake, but also by a submarine landslide or by a volcanic eruption which were able to increase the tsunami height dramatically. However, numbers of scenarios impeded the careful analysis. For this, we developed the Tsunami Reverse Tracking Method (TRTM) based on the linear hypothesis of tsunami wave propagation, to narrow down the possible source locations of tsunami. The Cornell Multi-grid Coupled Tsunami Model (COMCOT) was adopted for solving the shallow water equations. We also developed an Impact Intensity Analysis (IIA) method to quantify the tsunami impact from each discretized computational domain by calculating the maximum wave height. After that, a series of scenario studies were performed. Each scenario has to satisfy the geological feature and the simulated tsunami has to agree with the wave height recorded in the literatures. 7 landslide scenarios and 5 volcano scenario are showed in this study. The result shows most possible landslide scenario of the 1867 tsunami event was from Mein-Hwa Canyon, Keelung sea valley or Keelung Shelf. The most possible volcano scenario is from 35 km northwest of Keelung city.
| Identifer | oai:union.ndltd.org:TW/102NCU05761008 |
| Date | January 2014 |
| Creators | Chun-Juei Lee, 李俊叡 |
| 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 | 170 |
Page generated in 0.0111 seconds