长江南京以下12.5 m深水航道福姜沙河段整治效果分析

福姜沙水道在平面上呈现"两级分汊、三汊并存"的格局,地形条件复杂,局部滩槽演变剧烈,是长江南京以下12. 5 m深水航道重点整治河段之一。为论证福姜沙水道整治工程实施后的整治效果,基于实测地形、水文资料,系统对比了长江南京以下12. 5 m深水航道福姜沙河段整治工程实施前后滩槽演变、汊道分流分沙比调整、固滩效果、航道条件改善等。结果表明:福姜沙水道整治方案总体合理,整治效果符合预期,但须关注靖江边滩底沙活动对福北水道回淤的影响。

Analysis on regulation effect of Fujiangsha waterway of the 12.5 m deepwater channel of the Yangtze River below Nanjing

The Fujiangsha waterway in plane presents a pattern of branching twice and coexistence of three branches.With complicated topographical conditions and intense local channel evolution,it is one of the key sections of the 12.5 m deepwater channel of the Yangtze River below Nanjing.In order to demonstrate the effect of Fujiangsha waterway regulation project after its implementation,based on the measured topographic and hydrological data,the evolution of beach and trough,the adjustment of branching ratio,the effect of beach consolidation and the improvement of waterway conditions before and after the implementation of Fujiangsha waterway regulation project in the 12.5 m deepwater channel below Nanjing of the Yangtze River are systematically compared.The results show that the Fujiangsha waterway regulation program is feasible in general,and the regulation effect is achieved as expected.However,attention should be paid to the effect of bottom sediment movement along the Jingjiang River on siltation of the Fubei waterway.