长江下游镇扬段世业洲汊道演变和整治措施研究

长江下游镇扬河段平面形态复杂，整治难度大。从上游来水来沙变化、汊道分流比、深泓线及断面要素等方面，分析了该河段汊道近期河床演变特性，主要表现在左汊继续发展，右汊缓慢萎缩。为此，提出了汊道整治思路和整治工程方案，开展了河工模型试验研究。结果表明，从单方案看，工程规模越大，左汊减流越多；随着潜坝坝顶高程的增加，潜坝对左汊分流控制作用加强。左汊潜坝工程效果最好。

Evolution of Shiyezhou braided channel in Zhenyang reach of lower Yangtze River and regulation works

The plane configuration of Zhenjiang-Yangzhou reach (Z-Y reach) of Yangtze River is complicated, so the regulation is difficult. In terms of the incoming flow-sediment variation, flow diversion of branch, thalweg and sectional factor etc., the characteristics of recent riverbed evolution of Shiyezhou braided channel in Z-Y Reach of Yangtze River are analyzed. It is discovered that the left branch is developing and the right branch is shrinking gradually. The regulation thought and schemes of Shiyezhou channel and engineering measures are proposed and the physical model test is conducted. The results show that for a single scheme, the larger the project is, the more the flow of left branch would decrease. With the increase of the elevation of the dam top, the control of the flow diversion is strengthened. The analysis shows that the effect of submerged dike scheme is the best.