三峡蓄水后鲤鱼山水道演变对航道的影响与对策研究

Effect and countermeasure research of Liyushan waterway fluvial process influenced on navigation channel after operation of the Three Gorges Reservoir

三峡蓄水后改变了长江中游许多放宽河段原有冲淤规律,导致航道条件出现不利变化。通过对三峡蓄水后鲤鱼山水道洲滩演变的分析,研究了洲滩间的关系,揭示了河段洲滩演变与航道变化之间的关系,明确了近期河段航道不利变化是三峡蓄水影响下黄莲洲频繁冲淤、南槽冲刷发育、厍家湾边滩低滩周期性冲淤变化综合作用的结果,并据此提出稳定北槽边界,增强主航道枯水水动力条件的治理对策。

The balance state of silting and scouring of wider reaches in Middle and Lower Yangtze River werebroken after the operation of the Three Gorges Reservoir. These caused the channel condition appearing adversetrends. In this paper, the relation between sandbar changes and point bar changes was studied based on Liyushanwaterway fluvial process. On this basis, the relation between beach evolution and navigation channel variation in thewaterway was uncovered. It is put forward that the adverse variation of Liyushan navigation channel is caused byHuanglianzhou scouring and silting frequently, south channel scouring development and Shejiawan beach scouringand silting periodically. Ultimately, it came up with countermeasures to stabilize the river on both sides of the border of north groove and enhance hydrodynamic force of low flow in the main channel.