橋樑毀壞的主要原因是在颱風或暴雨時期的橋墩沖刷，進而使橋樑基礎裸露或橋樑毀壞。因此，橋樑周圍的沖刷深度需確切的評估，以確保橋樑的安全性。
本論文在橋樑數值模式上，選用CCHE1D模式做為一維動床水理模擬模式，在模式的驗證，以2005年的泰利颱風與石岡壩放水量進行計算，水位模擬與實測趨勢頗為近似。動床水理模式模擬石岡壩放流後下游河道之洪水歷程，模擬之洪峰水位值僅略高於觀測之峰值，洪峰到達時刻與實際情況也十分吻合，本文所選用的模式可以合理模擬下游河道水位變化。另外，在一般沖刷的分析中，利用2008年辛樂克颱風的觀測資料檢驗，結果顯示所選用的動床模組具備模擬大甲溪颱洪事件的能力，能合理預測水位與底床變化。最後本論文應用所選用之模式針對大甲溪石岡壩下游建立橋樑、橋墩水位與沖刷深度模式，以提供橋樑管理單位對於可能產生的災害進行預報作業。

Scour is a primary threat to bridge damages. The bridge scour may induce foundation exposures and bridge failures during typhoon or storm seasons. Therefore, the accurate estimation of scouring depth around bridge piers is expected to provide proper guidance for the safety of bridges.
CCHE1D model was adpoted to predict the scour depth around bridge piers. Some hydraulic and sediment parameters are considered, such as bed material, internal friction angle, particle size, and particle size distribution, and bridge pier geometry. A test analysis based on one-dimensional flood routing model will be performed to provide flow depth and velocity near pier sites. With the establishment of the relationship between flood stage and scour depth around bridge piers, the possible scour depth caused by the flood events in the future could be forecasted. Information predicted can offer an early warning of bridge damage to bridge managers.

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