氣候變遷導致極端降雨事件發生頻率增加，近年來造成許多土砂災害的發生。107年8月23日一場豪雨，誘發屏縣DF071土石流潛勢溪流中上游邊坡崩塌，大量鬆散的土石料源與降雨所形成的地表逕流形成土石流，造成下游386號橋通洪斷面不足溢淹至台26線路面，河道右岸一戶鐵皮屋亦遭土石掩埋，台26線路面土石堆積高度約2 m，道路雙向中斷。本研究使用日本京都大學發展的Hyper KANAKO模式，進行該事件的模擬並利用現地調查所蒐集的資料進行模式參數率定，藉由情境模擬了解可能致災位置，加入治理工程佈設後重新進行模擬演算，評估治理工程設置之成效，模擬成果可作為未來相關單位進行後續土石流災害防治之參考。

Extreme heavy rainfall resulted from climate change induced serious sediment related disasters such as the debris flow of Pingtung DF071 that occurred on August 23, 2018. This study focused on the simulation of debris flow hazard and evaluation of governance engineering in Pingtung DF071. The survey results show that there are many landslides in the middle and upper reaches of the watershed. These sediment materials will endanger the security objects of No. 26 road. The two-dimensional debris flow model (Hyper KANAKO) developed by Kyoto University was used to simulate the flow situation of debris flow hazard in Pingtung DF071. The results show that the river cross sections of the torrent cannot pass the 50-year return periods. The governance countermeasure of DF071 is to divert the debris flow discharge. It is recommended to cross the no. 26 road by submerged or advanced engineering methods. The simulation results can be used as a reference for relevant units to prevent and control debris flows in the future.