圖書典藏及影音數位平台

為推動臺灣洪水防護與土砂管理調適行動，前期已完成淡水河、濁水溪、曾文溪、與高屏溪流域，本年度針對氣候變遷對大甲溪流域的衝擊、脆弱度與風險分析進行研究，建立流域整體防洪需求、土砂生產處理對策等相關評估，檢討現有防洪與土砂災害預警系統，以規劃大甲溪流域洪水防護與土砂管理調適行動方案，落實流域水土災害疏散避難與救災對策。

Climate change will bring huge impacts to nations all over the world. Those impacts include the followings: change in biosphere, long-duration drought, large floods trigger by extreme torrential rain, spatial change in homelands, and food scarcity. The extreme weather induced by climate change is the most direct factor influencing the floods, e.g. the extreme rainfall increases discharge and inundation area, sea level and estuary water level raising induce overbank floods, and land-use abuse and land-slides trigger high concentration of sediment discharge and river bed aggradations.This project is focused on the Dajia River basin in middle of Taiwan. The project aims on the settings of hydrological scenarios due to climate change, evaluation of hydraulic structures (e.g. levees), establishing the sediment yield model of the river, sediment transport simulation are due to climate change, evaluation the impacts of sediment brought by extreme rainfall, vulnerability and risk analysis, and adaption strategy and practices for improving the capacity of the hydraulic structures of Dajia River for adapting to climate change.To evaluate the implication of climate change on sediment disasters, in the first year of this project, the literature had been collected to understand the status of climate change and the relative strategies in chapter 2. Chapter 3 describes the prediction of disaster locations according to the systematization analysis of flood hazards’ data in the past. In the chapter 4, the analyzing results show that the flow rate of Dajia River will increasing with 11% under the climate change situation. The complete sediment transport model for Dajia River basin has been proposed in the chapter 5. Finally, a study has been bringing up to understand the influence of the flood control structures with 11% larger flow rate. The risk factor of flood hazards was established, and the disaster risk management of Dajia River has been presented in the chapter 6.