长江镇扬河段是长江下游变化最剧烈的河段之一，其主要变化表现在世业洲左汊的缓慢发展及汇流后的主流不断右移、六圩弯道的崩岸及弯道向下游发展、和畅洲左汊的持续发展等。多年来为稳定河势，镇扬河段已实施了一、二期整治工程，使剧烈变化的河势已基本得到控制。根据镇扬河目前的情况分析了该河段来水来沙特点、近期河道演变规律及演变趋势，介绍了该河段二期整治工程的基本情况，并着重介绍了和畅洲左汊口门控制工程方案研究、设计、施工及工程效果等内容。工程后的实测资料分析表明，和畅洲左汊口门控制工程达到了预期的整治效果。

The Zhenjiang- Yangzhou (Z-Y) Reach is one of the most severely changing sections in the lower Yangtze River. To stabilize the river regime, the phase Ⅰ and phase Ⅱ regulation works have been implemented for years on this reach, resulting in the substantial control of severe change of regime. The behaviors of the inflow and sediment, the recent evolution rules and trend of the river channel in this section as well as the changing rules and causes of the change of the Hechangzhou brai- ded channel are analyzed and the scheme researches, engineering design, construction and the effects of the control works at the entrance of the left branch of the Hechang sandbar are presented in the paper. Measured data show that the regulation works of Hechangzhou braieled channel intrance has attained predicated effect.