长江口北槽深水航道回淤泥沙来源分析  

Sediment sources of the back-siltation in the North Passage of the Yangtze Estuary

作　　者：赵捷[1] 何青[1] 虞志英[1] 金鏐[2] 

机构地区：[1]华东师范大学河口海岸学国家重点实验室,上海200062 [2]交通部长江口航道管理局,上海200003

出　　处：《泥沙研究》2014年第5期18-24,共7页Journal of Sediment Research

基　　金：国家自然科学基金项目(41276080;51320105005);交通部科技项目(201132874660);水利部公益项目(201201068);上海市科委重点基金项目(12230707500;12231203100)

摘　　要：针对长江口北槽深水航道工程后,航道泥沙年回淤量逐年增加且分布集中在北槽中段的现象,系统分析了北槽回淤泥沙的主要来源,指出在河流来沙锐减情况下,流域来沙的直接落淤已经不再是航道泥沙回淤的主要来源;北槽内部滩槽泥沙交换及北槽与两侧浅滩(横沙浅滩与九段沙)的水沙交换对北槽泥沙回淤的贡献明显;南槽口门附近泥质区对航槽回淤影响的权重将增加,需要予以重视。今后应加强对水下三角洲前缘冲淤、浅滩的风浪掀沙以及丁坝坝田落淤泥沙的再悬浮和输移过程的系统观测和研究。The sources of back-siltation sediment were analyzed,in the North Passage （NP） of the Yangtze Estuary after the deep navigation passage project.Based on the fact that sediment from the basin is no longer the main sources of back-siltation,the sediment exchange between channel and shoal will play a more important role,including the internal exchange in the NP and the exchange between NP and Jiuduan Shoal,and Hengsha shoal.The authors suggest that the further field observations and research should focus on the accretion/erosion of muddy area in the south of the estuary which would have a greater effect on the NP,the sediment resuspension induced by wave on the shoal near the entrance and the dam area,and the sediment transport in the dam area.

关 键 词：长江口 回淤 泥沙来源 滩槽交换 

分 类 号：TV141.3[水利工程—水力学及河流动力学]