摘要
镇扬河段和畅洲汊道由于历史上主支汊易位多次,是长江下游分汊河道中演变最为剧烈的汊道之一。三峡水库蓄水、河道整治工程及航道整治工程的实施影响了和畅洲汊道形态的调整。分析了该河段来水来沙特点,介绍了河道(航道)整治的基本情况,并对河段的分流比及整治工程进行阶段性分析,研究了和畅洲汊道的河床演变,并统计了左、右汊断面特征值中主要因子的变化。结果表明:和畅洲汊道分流比变化可分为8个阶段,河道(航道)整治分4个阶段。左汊河段ZHL02及ZHL05~ZHL06,右汊河段的ZHR05断面附近深泓摆幅较大,应加强关注。近期左汊断面宽深比增大,主要表现为河宽增大;右汊断面宽深比减小,主要表现为水深增大。应注重加固稳定河势的护岸工程以稳定左汊分流比。二期整治工程中和畅洲左汊口门控制工程实施后,初期整治效果明显,左汊分流比减少了约3%;南京以下12.5 m深水航道整治工作实施后,和畅洲汊道左汊分流比明显减少,减幅约6.1%。
Due to multi-exchange of the main channel and branch Hechangzhou branch of Zhenyang reach in history,this branch is one of branch channels changed mostly in the downstream braided river channels of Yangtze.The impoundment of Three Gorges Reservoir and implement of the river regulation project and navigation channel project had affected the adjustment of Hechangzhou branch channel form.This paper analyzed the flow and sediment entering the reach and introduced the basic situation of river regulation.The diversion ratio and river regulation project were analyzed by stages,and the river bed evolution was studied.The change of the characteristic value of the major cross section of left and right branches was analyzed.The results showed that the evolution of Hechangzhou branch can be divided into eight stages,and the regulation projects can be divided into four stages.The thalweg oscillation of ZHL02、ZHL05 to ZHL06 of left branch and ZHR05 section of right branch of Hechanghzou reach were relatively large,which should be paid more attention to.The recent wideth-depth ratio of the left branch increased due to river width increment and the width-depth ratio of the right branch decreases mainly due to depth increment.In order to stabilize the diversion ratio of the left branch,the river bank protection project should be strengthened.After completion of the inlet control project of Hechangzhou left branch in the second stage of the regulation project,the regulation effect was obvious,and the diversion ratio of the left branch reduced by 3%.After the implementation of the regulation of the 12.5 m deep water channel at the downstream of Nanjing city,the diversion ratio of the left branch of Hechangzhou branch was significantly reduced by 6.1%.
作者
史常乐
钱嘉伟
王炎良
SHI Changle;QIAN Jiawei;WANG Yanliang(Lower Changjiang River Bureau of Hydrological and Water Resources Survey,Bureau of Hydrology,Changjiang Water Resources Commission,Nanjing 210000,China)
出处
《水利水电快报》
2022年第4期46-53,共8页
Express Water Resources & Hydropower Information
关键词
河道演变
整治工程
长江下游
镇扬河段
和畅洲汊道
riverbed evolution
regulation project
lower reaches of Yangtze River
Zhenyang reach
Hechangzhou branch
作者简介
史常乐,女,工程师,硕士,主要从事河道治理及工程泥沙方面的工作。E-mail:carolhappyshi@163.com。
