长江中游沙洲水道整治方案分析

Analysis on regulation scheme of Shazhou waterway in middle reaches of the Yangtze River

近年来,受三峡大坝清水下泄影响,沙洲水道滩槽变化不利于通航。根据长江航道治理规划及通航要求,分析沙洲水道实测资料,提出了沙洲水道航道整治思路;开展系列定床模型试验,分析不同方案对左汊分流比的影响,选择水流结构较优的方案进一步开展动床模型试验;通过典型年动床模型试验,考察河床冲淤、局部冲刷、航槽稳定等,确定了沙洲水道整治的推荐方案:黄州心滩头部布置3条带钩头护滩带,左汊内布置2道加长潜锁坝,其顶高程4.59m。相关成果可为工程实践提供技术支撑。

In recent years,due to the influence of clear water discharge from the Three Gorges Dam,the change of Shazhou waterway is not conducive to navigation.According to the management planning and navigation requirements for the Yangtze River waterway,the field data of Shazhou waterway were analyzed and the regulation idea for Shazhou waterway was put forward.Furthermore,a series of the fixed-bed model tests were carried out to analyze the influence of different schemes on the division ratio of left branch,and the movable-bed model test was carried out by selecting the scheme with better flow structure.Through the typical annual movable-bed model test,the riverbed erosion and deposition,local scour,etc.were analyzed,and the recommended schemes for Shazhou waterway regulation were determined:3 beach protection belts with hook heads were arranged at the beach head of the heart of Huangzhou shoal,2 extended latent locking dams were arranged in the left branch,and the height of lock dam crest was 4.59 m.Relevant achievements can provide technical support for engineering practice.