新形势下长江口南北港分汊口河段河势变化及治理策略

摘要

长江口南北港分汊口河段历史上是长江口水域河势变化最频繁的区域之一。基于该河段历史河势演变规律，在分析南北港分汊口治理效果的同时，对南北港分汊口工程兴建后新形势下长江口南北港分汊口河段河势变化趋势及治理策略进行研究和探讨。结果表明：新形势下南北港分汊口河势仍存在不稳定的因素，突出表现在扁担沙沙体未经人工控制和整治建筑物防冲抗刷压力增大；针对不稳定因素提出的治理方案经数学模型研究验证较为有效、可行。%The inlet river of the south channel and north channel is one of those with the most frequent change in the Yangtze estuary. Based on the analysis of river bed evolution and control effect of the south and north channel inlet project, this paper probes into the riverbed evolution trendy and further regulation strategy under new situation. The result shows that under the new situation, the inlet river of the south channel and north channel is still characterized with unstable factors, featuring especially the uncontrolled Biandan bar and the increasing impact-resistant brush pressure of regulation buildings. The regulation scheme proposed countering the unstable factors is proved effective and feasible by the tidal current mathematical model research.