长江芦家河浅滩段石泓大开挖方案的研究

Study on the chamfering of the Shihong section in Lujiahe shallow reach of the Yangtze River

三峡水库蓄水运用后,长江芦家河浅滩段将出现局部坡陡流急的航道问题,石泓大开挖为解决此问题的方案之一。采用全沙动床模型实验方法,研究了石泓大开挖方案实施后对改善航道条件、对本河段及上游河段河势变化可能产生的影响等。研究表明:石泓大开挖方案将改善本河段的航行条件;也将使本河段枯水期的主、支汊易位;改变松滋河的分流特性;与此同时石泓大开挖方案将加剧上游水位的下降,并可能因此影响葛洲坝船闸的正常运行;挖槽中推移质泥沙的回淤有待于今后的进一步研究。

The construction of the Three Gorges Reservoir may brings about a new problem to the Lujiahe shallow reach, and chamfering the Shihong (the right thalweg) is one of the measures suggested Based on the model experiment, the effect of chamfering has been studied, proving that chamfering can solve the problem of lag in depth in the navigation channel of sha-hong (the left thalweg) and escarpment and riffle as well, and improve the navigation condition of the whole reach completely Meanwhile, chamfering will make the main flow translocation with the lateral branch in dry season, and decrease the discharge diverting ratio of the Songzihe River(an important tributary of the Yangtze River in this reach) from the Yangtze River, etc However, the extra descendent of water stage of the upper reach resulted by the chamfering may foreclose the normal navigation condition of the Gezhouba Ship Lock, etc