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石门拱坝是国内已建成的中孔泄洪拱坝中孔口面积最大和孔口数目最多的一座,且坝址处河谷较窄,泄洪的单宽流量及水头都比较大。工程建成后,中孔泄洪对枢纽筑物及两岸的冲刷影响,引起了人们的关注。石门拱坝运行十二年,经历了设计洪水的考验,下游冲刷的安全监测取得了一定的成果,藉此分析以验证设计、施工及模型试验成果,以确保大坝安全运行。
Shimen Arch Dam is a built-in medium-density spillway arch dam in the largest hole and the largest number of openings, and the dam at the valley narrower, flood discharge of single-wide flow and head are relatively large. After the completion of the project, the impact of flood discharge on the hub structures and the erosion across the Taiwan Strait has aroused people’s attention. After 12 years of operation, Shimen Arch Dam has undergone the test of design flood. The safety monitoring of downstream scour has achieved certain results. The analysis has been carried out to verify the design, construction and model test results to ensure the safe operation of the dam.