Abstract: Through the generalized model experiment of sand-gravel extraction of Degan dam in the Yangtze river, the erosion process of each level of flow was simulated, and the influence of sand mining on Degan dam river was also analyzed. The test results indicate that the navigation ability variation of the river bed, the regime and the channel caused by mining in the mountainous river is lesser, and the sand mining pit is also difficult to cause the traceability of the scour. The river course engineering is of almost no effect, so it is suitable for the establishment of sand mining point to extract sand. But the mining pit backfill quantity is far less than its yield, so the mining amount and mode should be scientifically planned, which will guide the regime to develop in the stable direction.

Key words: waterway engineering, sand-gravel extraction, generalized model, Degan dam, traceability scour

摘要： 通过长江德感坝采沙概化模型试验，模拟了各流量级的冲刷过程，分析了采沙对德感坝河段的影响。结果表明：山区河流采沙引起的河床、河势、航槽通航能力变化影响较小，采沙坑 也很难引起溯源冲刷，对涉河工程影响甚微，该处适合设立采沙点进行采沙作业；但采沙坑回填量远小于其开采量，应科学规划开采量及开采方式，引导河势向有利于稳定的方向发展。

关键词: 航道工程, 采沙, 概化模型, 德感坝, 溯源冲刷