因應近幾年氣候變遷大，容易發生各種災害，其中堰塞壩潰決造成下游嚴重的災害，如能了解其發生機制，有助於防災及疏散預警以降低災情。本研究以實驗探討非黏性之石英砂堆積之堰塞壩，實驗以影像分析及超聲波探測器觀察上游及壩頂之歷程變化。依供水及土壤特性可分為漸進式破壞及溢流破壞兩種，並改變堰塞壩幾何關係，以探討其破壞歷程之差異性，並分析未破壞時滲流線的變化，及潰壩過程的土體及出流量變化。;The failure process of the landslide dam due to seepage and overtopping is experimentally explored in this study. Both triangle and trapezoidal dams of coarse quartz sand are built in the flume, and the failure modes due to progressive seepage damage or abrupt overflow are observed. The transient phreatic line prior to the seepage failure develops in a self-similar shape form in terms of the advancing front height and distance. The discharge at the dam can be estimated according to the flow characteristics over half-circular weir. The histogram of dam-breaking flood and the sediment transport of the dam are analyzed.
