长江中游新洲—九江河段航道治理二期工程思路与方案研究

Waterway regulation idea and scheme of Xinzhou-Jiujiang River reach in the middle reach of the Yangtze River

为给长江中游新洲—九江河段航道治理二期工程提供技术支撑,开展了治理思路及方案的研究。通过分析新九河段近期河床演变、6.0 m水深航道变化及存在问题,提出治理思路;借助平面二维水沙数学模型,开展了不同部位、不同措施效果,确定了工程部位;通过数模研究了二期工程推荐方案效果。结果表明:推荐方案实施后能减小徐家湾沿岸槽分流比,增加新洲、九江浅区流速,限制鳊鱼滩左汊分流比,系列年内6 m×110 m×1 050 m的航道尺度基本得到满足,但不利水文年新洲水道需要疏浚维护。

In order to provide technical support for the waterway regulation of Xinzhou-Jiujiang river reach in the middle reach of the Yangtze River,researches on the regulation idea and schemes were conducted.Based on the recent evolution analysis,waterway conditions and navigation-obstructing characteristics of Xinzhou-Jiujiang river reach,regulation ideas were proposed.Single project schemes and the whole scheme were studied,and then a preliminary waterway regulation scheme was recommended,which ensured to satisfy the planned channel dimensions.The results of physical and mathematical model researched on the recommended scheme show that it can reduce Xujiawan flow,increase the flow velocity of the shallow area,and limit the diversion ratio of the left branch of Bianyutan bar.In the series,the channel scale（6 m × 110 m × 1 050 m） can be basically satisfied,but in some year’s waterway needs to be dredged.