长江界牌河段河道演变与综合治理效果分析及后续整治思路

 利用实测水沙和地形资料,系统地分析了长江中游碍航严重浅滩河段——长江界牌河道的演变特点、趋势及综合治理工程效果。分析表明:综合治理工程总体上稳定了河势，改善了防洪和航运条件，但部分滩槽和过渡段未得到完全控制，汊道分流比不稳定、变化较大，航槽位置不稳定、局部岸线崩退。在此分析基础上，研究提出了实施新淤洲前沿低滩守护、右岸上边滩丁坝维修加固、左岸下复粮洲一带护岸守护、左槽出口局部碍航浅区疏浚等后续整治思路，可为界牌河段后续整治工程研究与设计提供参考。

Fluvial Evolution and Comprehensive Regulation Effect in Jiepai Segment of Yangtze River and Its Subsequent Regulation Considerations

On the basis of measured data of water and sediment and terrain,we analyzed the evolution characteristics,trend,and comprehensive regulation effect of a shoal segment of serious navigation obstruction named Jiepai segment in the middle reach of Yangtze River.Results show that regulation project keeps the terrain stable on the whole,and improves the flood control and navigation conditions.Nevertheless,part of the swales and transition segment are not under complete control,with fluctuating split ratio of branching channel,unstable location of dredged channel,and local collapses and retreats of bankline.Subsequent regulation considerations are put forward as follows: protection of the front low shoal of newly-silted sandbar,maintenance and reinforcement of the spur dike on the upside shoal of the right bank,bank protection of Xiafuliang sandbar on the left bank,dredging of the shallow region of local navigation obstruction at the outlet of left trough.This research will provide scientific basis for regulation and project design.