长江南京以下12.5m深水航道落成洲航段平面调整探讨

长江南京以下12.5m深水航道二期工程实施后,落成洲段航道整治效果显著,船舶流量增加且大型化趋势明显。受嘶马弯道弯急流大、10.5m航道与12.5m航道共存、下行大小型船舶混航等影响,落成洲航段通航环境复杂,2017年洪季出现多起上行大型船舶错误驶出12.5m航道水域而出浅的险情。根据河床演变、流场和通航行为等分析研究,落成洲航段可考虑向左侧调整主航道平面、增设下行推荐航路实现大小型船舶分道通航、应用虚拟航标、完善航道整治工程等措施,以达成安全高效的通航格局。

Discussion on the layout adjustments at Luochengzhou passage of the 12.5 m deep channel of the Yangtze River downstream of Nanjing

After the implementation of the second phase of the 12.5 m-deep channel regulation project in the Lower stretch of the Yangtze River downstream of Nanjing,the effect of channel regulation in the Luochengzhou passage is remarkable with ship traffic increasing and large-scale trend of vessels passing being significant.The navigation environments in the Luochengzhou passage are complex as affected by the sharp curve and high flow velocity at Sima bend,the coexistence of -10.5 m and -12.5 m deep channels,the mixing downstream sailing of large-scale and small-scale vessels and other factors.In the flood season of 2017,there were several cases of large-scale ship grounding accidents owing to sailing out of the -12.5 m deep channel by mistake while sailing upstream.According to the analyses of riverbed evolution,flow field and navigation behavior,this paper proposes the following optimization measures to be taken in the Luochengzhou passage:to realign the layout of the main channel to the left,add an additional recommended downstream route to realize the separate sailing of large-scale and small-scale vessels,apply virtual aids to navigation,and optimize the existing waterway regulation projects,to further establish a safe and efficient navigational pattern.