新江海河航道梯级布置方案技术经济分析

Technical and economic analysis of cascade layout scheme of Xinjianghai River waterway

针对新江海河航道双桥枢纽与新江海枢纽距离近、水位差小且上下游平水期长,对双桥梯级方案取消与否两种方案进行技术经济分析。结果表明,取消双桥梯级方案对区域防洪、排涝、水系连通、水质等影响较大,水系恢复工程总投资和营运费用高,项目内部收益率低;保留双桥梯级方案维持现有水系布局,船闸具备开通条件,可与新江海河船闸联合调度,共用待闸锚地,经济上合理。

In view of the close distance between Shuangqiao junction and Xinjianghai junction in the Xinjianghai River waterway,the small water level difference,and the long normal level period in the upstream and downstream,this paper carries out the technical and economic analysis of retaining or canceling the Shuangqiao cascade scheme.The results show that canceling the Shuangqiao cascade scheme has a great influence on regional flood control,drainage,water system connectivity,and water quality.The total investment and the operation cost of the water system restoration project are high,and the internal rate of return of the project is low.In contrast,retaining the Shuangqiao cascade scheme to maintain the existing water system layout can ensure that the ship lock can be opened and jointly dispatched with the ship lock of the Xinjianghai River,so as to share the anchorage to be locked,which is economically reasonable.