2011年3月11日在日本福島縣外海發生芮氏規模9.0的強烈地震，隨後引發了大海嘯，對日本沿岸區域都造成相當大的災情。近年來，海嘯議題逐漸受到重視，台灣與日本相鄰，同樣地面對到地震與颱風等天災影響，因此更不可忽視海嘯侵襲台灣的可能性。
現今計算機能力迅速發展，由於實驗室受到空間尺度上的限制，採用數值模擬將為研究的主要方法之一，本研究的目的將在於能透過CFD(Computational Fluid Dynamics，計算流體力學)進行數值模擬分析，首先為驗證數值方法的可信度，回顧文獻了解孤立波與海嘯有相似的特性，藉以國立成功大學水工試驗所孤立波研究之試驗，建立數值模式以進行模擬比對其實驗量測結果並加以驗證，比對結果無法非常準確地與實驗值相符，但所採用的速度值與波高值趨勢仍有一致性，其誤差值亦在可接受之範圍內。進而一步，探討模擬造波海嘯之行為，本研究模擬出各不同起始高度之海嘯，其中，當造波塊等速度90m/s直推運動，可造出一海嘯其上岸的最大波高已達20.93m。爾後衝擊至10公尺結構物之底層受衝擊壓力達293063 Pa並此時約在4公尺處有最大波壓414150Pa。

The great earthquake of M_w=9.0 occurred on 11 March 2011, and subsequently caused the Tohoku-oki tsunami which caused devastating disaster in northeastern Japan and coastal towns. As the damaged nature disasters caused heavy casualties and economic losses, recently people have gradually paid their attention to tsunami issue.
As the laboratory subject to restrictions on the spatial scale, this study through CFD (Computational Fluid Dynamics Computational Fluid Dynamics) numerical simulations analyze the impact of water force on a residential building which are located on mildly sloping beaches.
In order to verify the feasibility of the CFD numerical methods, the velocity and wave height of the numerical simulations results were comparison with the measurement results.
And then, this study presents the numerical simulations investigation into the impact of tsunami during the run-up process on a beachfront residential building. The results shown that the highest wave height is 20.93m when tsunami reached ashore. Later, tsunami impact to the building. The pressure of tsunami on the bottom layer is up to 293063 Pa and at this time the maximum wave pressure is 414150Pa at about 4 meters height of the building.

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