圖書典藏及影音數位平台

大安溪為台灣中部重要之中央管河川，主流全長95.76公里，流域面積約758平方公里。九二一震後大安溪流域環境改變，近年來氣候變遷與極端降雨影響下，加重水土砂災害。本計畫藉由水系之風險評估，以了解高風險河段之致災原因，並考量環境可用資源，擬定可行的對策及計畫，依計畫分年分期執行，並隨時檢討執行的成果作為後續精進的參考，以達減低災害發生的目標。

The natural environment of Daan River Basin have changed drastically due to the Chi-Chi earthquake in 1999. The environment should be returned to the condition before the earthquake after several tens years restoration projects. However, the global climate change and extreme rainfall exacerbate the debris and flood disasters which increase the diffculty of water resources management. Thus, a flood risk assessment based on basin scale is required to establish the optimum regulation strategy. To enhance the management of Daan River Basin and the safety of flood defence structures, this project presents the framework of flood risk analysis and applies it on the whole catchment. The flood risk assessment includes (1) assessment of geology and earthquake influences; (2) analysis of monitoring data; (3) investigation of the safety of flood defence structures; (4) evaluation of early-warning system; (5) simulation of dike failure; and (6) review of emergency plan. Based on the above works, the regulations for safety inspection of flood defence structures will be reviewd to establish a consummate system for risk assessment, safety inspection and evaluation.