台灣位於地震的活躍區，若台灣附近海溝引發地震規模9.0以上的海底地震，所產生的海嘯會直接對附近沿岸陸地造成衝擊，而海底地震所引發的海嘯波傳遞至沿海地區的陸地時，所造成的淹水程度影響會因陸地的地形、地貌、地物而不同。
本研究應用COMCOT (COrnell Multigrid COupled Tsunami model)模擬琉球海溝發生規模9.5的強震時所產生海嘯波傳遞情形，並在模擬過程中於外海地區設置多潮位觀測點以觀測海嘯波傳遞時自由液面的變化情形。再以觀測點模擬所得的自由液面變化情形和當地天文潮資料疊加後，作為地文性淹排水模式(Physiographic Inundation Model)的下游邊界。以蘭陽平原為研究區域，分別以海嘯波、海嘯波與2008年辛樂克颱風暴雨資料兩者案例進行研究區域內淹水潛勢之模擬與比較。
模擬結果得知，琉球海溝錯動19分鐘後，海嘯前導波抵達研究區域；錯動55分鐘之後研究區域受到首波海嘯波襲擊，而首波海嘯波即為最大海嘯波，其波高為13.52公尺。淹水潛勢部分，海嘯波案例最大淹水深度為5公尺，溢淹最長距離為10.6公里，海嘯波與暴雨案例最大淹水深度為12公尺，溢淹最長距離為11.2公里。而海嘯波、海嘯波與暴雨兩案例作比較，淹水面積增加了7610公頃，由於海嘯波上溯河道阻礙河道排水，導致淹水深度增加、淹水面積變大。

Taiwan is located at seismic zones. If the undersea trench near Taiwan triggers an earthquake over 9.0 on the Richter scale, the tsunami generated will impact directly on the coastal areas. The tsunami wave yields different impacts on flooding potential occurring at the coastal areas due to land topography and surface features.

We apply the COMCOT (COrnell Multigrid COupled Tsunami model) model to simulate the tsunami transport of a scale 9.5 earthquake from the Ryukyu Trench dislocation. We also set up multiple tide observation stations in offshore areas during the simulation to observe changes in free surface when tsunami waves passed. The simulation results of the COMCOT model are then incorporated into the Physiographic Inundation Model as the downstream boundaries. We simulate the flooding potential of the Lanyang Plain with two scenarios: tsunami only, and tsunami and Typhoon Simlaku, 2008.

The results show that tsunami generated from the Ryukyu Trench arrives the study area in 19 minutes; the first tsunami wave (the highest wave) with a height of 13.52 meters strikes the study area in 55 minutes. The results of flooding potential for the first scenario (tsunami only) show that the maximum flooded depth is 5 meters and the farthest flooded distance is 10.6 km. In the second scenario (tsunami and Typhoon Simlaku), the maximum flooded depth is 12 meters and the farthest flooded distance is 11.2 km. Comparing with these two scenarios, an increase of 7610 hectares in flooding areas can be observed since tsunami waves hinders the drainage of river channels.

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