近年來，世界各地漸漸開始重視環境巨災所帶來的重大迫害，其中淹水為最常發生之環境巨災，而台灣四面環海，常有颱風侵襲，且地勢陡峭、河流短又湍急，一旦遇到暴雨，容易引發嚴重淹水災情，故對於如何面對淹水所造成的經濟人員損失，已成為當今重要課題。 華道明(2018)為製作淹水風險評估模型，他利用水文數值模式WASH123D模擬台灣中港溪流域，進行定量降雨和重現期降雨的淹水模擬，但因華道明(2018)僅使用WASH123D三個波模式的其中一種，並沒有使用另外兩種波模式來模擬上游地區，導致其結果在上游地區產生了些許誤差，淹水潛勢結果較不精準。 本研究主要是修正華道明(2018)在模擬上所產生的誤差，使用HEC-HMS模擬上游地區逕流，並結合WASH123D進行模擬，並探討這兩種作法有何差別，結果顯示本研究的模擬結果比華道明(2018)的模擬結果在不管是上游山地地區還是下游平地地區，都來的更精準。;In recent years, the environmental related disaster attracts more attention from time to time. Flooding is the most frequent natural disaster. Taiwan is often hit hard by typhoon and the topography of river are commonly steep. If hit by torrential rain, flooding happen very often. How to deal with the loss of flooding is a very important topic. Hua Dao Ming (2018) used WASH123D to simulate flooding map of Chungkang-River basin from quantitative precipitation and precipitation of different return period to build up flooding risk assessment model. But Hua, Dao Ming (2018) only utilized dynamic wave model which only suitable for plain area not for steep area. In the study, we used HEC-HMS to analyze the runoff of steep upstream area and then used them as input for WASH123D to produce flooding map for different return period.
