细颗粒泥沙运动及滩槽交换对航道回淤的影响  

Influences of fine sediment transport and transversal sediment transport between shoal and channel on channel siltation

作　　者：金镠[1] JIN Liu(Yangtze Estuary Waterway Administration Bureau,Ministry of Transport,Shanghai 200003,China)

机构地区：[1]交通运输部长江口航道管理局

出　　处：《水运工程》2019年第8期111-116,共6页Port & Waterway Engineering

摘　　要：潮汐河口细颗粒泥沙为主的泥沙运动方式呈现出复杂的形态,其不同的运动形态对河口演变和航道回淤问题的研究十分重要。讨论在潮汐、波浪条件下,非黏性沙的层移运动和黏性细颗粒泥沙近底高浓度悬沙层的类推移运动,以及浮泥层的推移运动等泥沙运动形态的特点、发生条件和运移规律。针对长江口南槽水动力条件,利用前人水槽试验成果,估算了主槽水体含盐度高于浅滩时,航道两侧浅滩近底高浓度悬沙横向输移进槽的输沙量,得到与实际基本相符的结果。The mode of sediment transport is complex in a fine sediment tidal estuary.The different forms of sediment transport are very important for the study of estuarine evolution and channel siltation.Under tidal and wave conditions,this paper discusses the characteristics of bedload transport of non-cohesive sediment,movement of near bed high concentration suspended cohesive sediment layer and fluid mud layer,and characteristic,occurrence condition and transport rule of other sediment.Based on the hydrodynamic condition in the South Channel of the Yangtze Estuary and the result of previous flume study,this paper estimates the transversal sediment transport of high concentration suspended sediment from the nearby shoals into the channel when the salinity of the main channel is higher than that of the shoal.The result is basically in agreement with the actual result of channel sedimentation.

关 键 词：淤泥质海岸 波致液化 液化层输运速度 海床稳定性 

分 类 号：U616[交通运输工程—船舶及航道工程]