2018年度长江上游航道维护性疏浚工程后评价

系统评估2018年长江上游航道维护性疏浚工程实施效果,为今后航道维护工程提供技术参考。基于年度水情及航道疏浚滩段分布情况,分析维护性疏浚方案设计、施工时机和频次、施工过程的动态管理及航道可持续性等。结果显示,2018年长江上游干线航道维护性疏浚工程总体效果良好,滩段选择及疏浚方案设计与河道演变规律基本适应;疏浚时机及频次基本合理,最大程度地缓解了与通航的矛盾;但由于维护性疏浚未大幅改变河道水流特性和河床边界,因此天然河段浅滩航道可持续性较差,仍需加强观测,必要时采取其他整治措施。

Post-evaluation of maintenance dredging project of the upper Yangtze River waterway in 2018

To systematically evaluate the implementation effect of maintenance dredging in the upper Yangtze River waterway in 2018 and provide technical reference for future waterway maintenance projects,based on the systematic analysis of the water situation,we evaluate the dredging project from the dredging scheme design,construction timing,dynamic management of construction process,as well as sustainability of the channel.The results show that the selection of beach section and the design of dredging scheme basically adapt to the river evolution law.The time and frequency of dredging are basically reasonable,which reduce the contradiction with navigation to the greatest extent.However,since the maintenance dredging has not significantly changed the river flow characteristics and riverbed boundary,the sustainability of shallow channel in the natural reach is poor,so it is still necessary to strengthen observation or take other regulation measures.