和畅洲水道深水大流速潜堤施工顺序及实施效果

Construction sequence and regulation effect of the submerged dyke under the high velocity and deep water at Hechangzhou waterway

针对长江下游深水大流速条件下航道整治工程施工顺序安排的问题,采用数学模型和河床演变分析相结合的方法,探讨了和畅洲左汊限流潜堤施工顺序安排的原则及工程整治效果。结果表明:和畅洲限流潜堤实施后,左汊分流比减小9%,右汊冲刷发展,航道条件得到明显改善;流场和地形调整基本与预期相符,工程达到了左汊限流、右汊增深的工程整治目标。研究成果可为长江下游航道整治工程施工顺序研究提供参考和借鉴。

Aiming at the problem of construction sequence arrangement of the channel regulation engineering under the high velocity and deep water in the lower reaches Yangtze River,the research of construction sequence principle and regulation effect of the submerged dyke at the left braided channel of Hechangzhou waterway were carried out by combining mathematical model and river bed evolution analysis.The results showed that the diversion ratio of the left braided channel decreased by 9% after the implementation of the submerged dike,and the navigation channels were deepened obviously due to the riverbed scouring of the right braided channel;the flow fields and topographic adjustment were basically in line with the expectations,and the regulation effect was achieved by that of limiting in the left braided channel and deepening in the right braided channel.The results can provide a reference for the construction sequence research of the navigation channel regulation in the lower Yangtze River.