近年來，集集攔河堰蓄水區淤積減少蓄水容量及庫水濁度上升問題，是集集攔河堰於水資源營運管理上需積極面對之課題。為減少水庫淤積與降低庫水濁度，以保持取水口正常取水與取水品質，本文應用水深平均二維沖淤模式之模擬以評估疏浚及防淤策略之效果。
應用二維沖淤模式進行集集攔河堰庫區在敏督利颱風與各重現期距年最大二日暴雨量之底床沖淤及溢洪道排砂模擬。根據模擬演算結果可得出排砂道水力排砂的有效範圍，進而決定機械清淤之適當位置。高水期的水力排砂及蓄清排渾操作可有效減少庫床淤積，增進集集攔河堰蓄水功能之永續利用。

In resent years, the problems of reducing capacity of storage and the rising degree of turbidity in reservoir is getting worse. The official of Chi-Chi Weir should take activity in facing these problems in water resource operation and management. In order to reduce the deposit and the turbid degreed of water of the reservoir, and to keep the intake fetching water normally and the quality of fetching water, we use depth averaged 2D bed evolution module in this article to simulate the effect of dredging and the tactics of defending silt.
Using this module to simulate the bed evolution in the reservoir and the desilt of spillway of Chi-Chi Weir during the MinDuLi typhoon and the two day heavy rain at each reappearance. According to the result of mathematical calculations, we can get the effective range of hydraulic desilting of desiltway, and decide the appropriate site of mechanical desilt further. The hydraulic desilt and save-clear-exclude-turbid operation in the period of plentiful water can effectively reduce the deposit of the reservoir and promote the sustainable use of storage function in Chi-Chi Weir.

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