长江下游福姜沙河段12.5m水深主航道选汊研究

Study on branch selection for 12. 5 m-deep main channel in Fujiangsha reach downstream the Changjiang River

近年来,江苏沿江社会经济高速发展,港口相应得到快速发展,对主航道提出了新的要求,相应长江南京以下主航道水深从10.0 m提升到12.5 m的航道治理工程即将实施。长江南京以下有多个分汊河段,主航道选汊不仅将决定南京以下长江深水航道的总体格局,而且给分汊河段的港口运营和发展带来深远影响。基于对福姜沙河段各汊道稳定性分析,给出可能的4大类选汊方案,并采用数模进行效果和影响分析而确认各自对应的可行方案,经包括技术可行性、港口适应性和通航多方面论证,认为福中双航道类方案和"福北单"+"福中单"类方案可作为推荐选汊方案,开展工程方案层面的分析研究。

In booming alongside th recent years, ports and harbours have been developing rapidly and riverside industrial zones e Changjiang River in Jiangsu province, which poses new challenges for the main channel of the downstream Changjiang River. As a result, it is proposed to execute a channel regulation project in the Lower Reach of the Changjiang River downstream of Nanjing, to deepen the main channel of the said lower reach from 10. 5 m to 12. 5 m. There lie several branched waterways in some parts of the lower reach downstream of Nanjing. Therefore, the selection of the branch for the main channel will not only determine the overall pattern of the Changjiang deep- water channel, but also have a significant influence on port operations and development alongside the branched river reaches. Considering the requirements in technical feasibility, harbour suitability, traffic management, etc., this paper presents some essential principles on the selection of branch for the main channel in a branched reach of a river. Fujiangsha reach is the only section of the lower reach which has three branches of waterways. Based on an analysis of the stability of its branches, this paper gives four potential categories of options for branch selection. Mathematical models and other methods are used to analyze their possible effects and influence to get one feasible option from each category of options respectively. Through demonstration in all aspects according to the proposed principles on the branch selection, two options, separately selected from ＂Fuzhong two-way＂ category of options and ＂Fubei one-way ＋ Fuzhong one-way＂ category of options, are recommended for further analysis in the next stage.