疏浚施工中截沙槽的应用

在长江南京以下12.5 m深水航道工程一期疏浚工程施工中，因通州沙航道受裤子港沙尾部右缘淤涨南压影响，水深逐步变差，直接影响了B区的疏浚施工。研究通州沙水域水沙运动特点、床沙特性及潮汐特征；分析河势变化及回淤特点；通过在B区航槽外预设截沙槽，减缓航槽边缘泥沙进入航槽的速度；对实施效果进行总结分析，对工程后续施工提出建议。

Application of sediment kerf in dredging construction

In phase 1 dredging engineering of the 12.5 m deepwater channel of the Yangtze River below Nanjing city,the situation of the Tongzhousha channel depth is influenced by the southward movement of the right edge of Kuzigangsha tail,which directly interferes with the dredging operation within area B. Based on the study on water-sand behaviors,bed sand and tidal features and analysis of flow regime and back-silting characteristics,we preset the sediment kerf to mitigate sand flowing from edges into the inner channel. An analysis of the implementation effect of sediment kerf is presented and advices are given to the follow-up construction.