洪水事件頻仍，許多橋梁因洪水沖刷而導致損毀、斷橋，造成嚴重的災害及重大的損失，加上洪水事件中可供參考之橋墩沖刷的量測資料十分稀少，因此在本研究中藉由沖刷磚埋設實驗蒐集洪水事件期間，對河床、橋墩附近造成之沖刷深度的數據，並根據集水區的現地觀測資料進行一般沖刷經驗公式的率定及驗證，期望能夠提供橋梁專業人員從事設計工作時作為參考。
為了獲得現地的沖刷時底床高程變化的資料，本研究採用沖刷磚埋設實驗，將已編號磚頭依序埋設於目標橋梁具有參考性的位置，於颱洪事件發生前埋設，事件發生後開挖找出剩餘磚頭之編號，即可量測出颱洪事件期間洪水沖刷沖走之磚頭數計算造成的最大沖刷深度，獲得量測資料後，藉由計算沖刷深度之經驗公式，與量測資料進行比較後進行適用可行性評估，選出最適合模擬河道之一般沖刷的經驗公式。
沖刷磚埋設實驗量測結果發現，埋設於橋梁上游100公尺處之沖刷深度值，由於沖刷過程並不受橋梁影響，因此沖刷深度屬於一般沖刷。於102年蘇力颱風颱洪事件，在橋墩上游100公尺處實測沖刷深度為4.14公尺，下游100公尺處實測沖刷深度為5.94公尺，與一般沖刷經驗公式推估值對照後，發現Blench公式較符合現地之沖刷深度。

Frequent flood events broken or did major damage to a large number of bridges. As a result, serious damage and major loss happened. Since there is shortage of survey data for flood wash away of bridge piers, this research collected the scouring depth data of riverbed and the sections near bridge piers during flood period with buried wash-away blocks. For obtaining riverbed level variation on the scene, this research buried wash-away block with serial numbers before typhoon flood events. After typhoon flood events occurred, the remaining blocks were excavated and then the serial numbers of the remaining blocks were identified. The maximum scouring depth of the event was derived by counting the blocks washed away by flood scouring. The survey data was compared with the results of general scour empirical formula to choose the best general scour empirical formula for simulating general scours of river course.

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