京杭运河沟通钱塘江八堡船闸口门综合整治方案

Comprehensive regulation scheme for entrance area of Babao ship lock connecting Grand Canal and Qiantang River

京杭运河沟通钱塘江八堡船闸出口位于七堡弯道强潮河段,水流泥沙条件极其复杂。为满足通航要求,需要采取综合整治措施。针对河势变化、航槽水深、通航水流条件、闸下引航道泥沙淤积、出口通航保证率等问题,采用河床演变分析、潮流泥沙数学模型计算、物理模型试验、船模及实船航行试验等综合方法和手段进行深入研究,验证了船闸出口河段岸滩综合整治方案。结果表明:通过清理残坝、缩短丁坝长度以及增建导航堤等工程措施,促使航道主槽靠近船闸出口,显著提高口门区通航保证率,闸下引航道和口门区泥沙淤积量在可控范围。

The exit of the Babao ship lock connecting the Grand Canal and Qiantang River is located in the strong tidal bore reach of the Qibao bend,where the water flow and sediment conditions are extremely complex.Comprehensive regulation measures should be taken to meet the navigation requirements.In view of the river regime change,channel depth,flow conditions for navigation,sediment deposition in the downstream approach channel of the ship lock,and the navigation assurance rate at the exit of the lock,comprehensive methods and means are applied for an in-depth study,including the riverbed evolution analysis,mathematical model calculation of tidal flow and sediment,physical model test,and ship model and vessel maneuvering test.The comprehensive regulation scheme for the beach at the exit of the lock is verified.The results show that by clearing the residual dam,shortening the length of spur dikes,adding navigation dikes,and other engineering measures,we can make the main channel close to the exit of the ship lock,significantly improve the navigation assurance rate of the entrance area,and ensure that the sediment deposition in the downstream approach channel of the ship lock and the entrance area is within the controllable range.