水壩及堰塞湖因位於上游段具有極高的位能，一旦瞬時潰決其水體突然湧出潰堤勢必對下游地區形成嚴重的威脅，導致下游沿岸設施及人民生命財產、社會經濟活動之重大損失。因此，本文乃針對潰壩後之洪峰傳播現象進行觀測分析研究。
主要以實驗的方式來觀測三種擋水閘門開啟的速度來了解全潰壩後的洪水流速與洪峰傳播情形，並討論當水深為20與40公分時、水深比0.1、0.3與0.5狀況下，在不同時間之瞬時潰壩所產生的水位歷線圖，來分析洪水流速與洪水波傳播速度變化情形等。
依相關觀測結果分析發現其趨勢如下：
上游水位(h)及水深比(r)相同時，閘門開啟速度(V)越快，則流速越快。閘門開啟速度(V)與水深比(r)相同時，上游水位(h)越大，則流速越快。洪水的流速會因閘門開啟的速度不同，影響瞬間的流速，但到一峰值後對於流速的影響逐漸變小。

Since water in dam lake is located at upstream area, it carries extremely high potential energy. As a result, flood caused by dam break presents serious threat to downstream public facility, civilian well-being and economic activity. Hence, this study investigates the transmission speed of the flood peak caused by the dam break.
With experiments of three different gate opening speeds, this study investigates the transmission speed of the flood peak caused by the dam break. Also, in the case of 20 and 40cm water depth and water depth ratio of 0.1, 0.3 and 0.5, flood hydrographs of dam break at different times are investigated to analyze transmission speed variation of the flood peak caused by the dam break.
When upstream water level(h) and water depth ratio(r) are constant, flood flow speed increases with gate opening speed. When gate opening speed(V) and water depth ratio(r) are constant, flood speed increases with upstream water level(h). The effect of gate opening speed on instant flood speed decreases after flood speed reaches peak value.

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