盐度、悬沙层化与水流紊动的相互作用对于河口地区水动力、盐度和泥沙运动过程具有重要作用，目前虽然对盐度与悬沙层化效应均有不少研究成果，但对盐度和悬沙联合层化与水流紊动相互作用机理尚缺乏深入理解，特别是缺乏合理描述该现象的紊流模型。本项目拟通过振荡格栅水槽实验和细观尺度数值模拟相结合的方法揭示盐度和悬沙联合层化与水流紊动之间的相互作用机理和规律，并在此基础上建立可以描述河口实际尺度条件下盐度和悬沙联合层化的紊流模型，为河口泥沙运动模型的建立奠定基础。上述工作对于理解长江河口近底高含沙运动现象和规律，预测长江口深水航道淤积规律有重要的科学意义和实用价值。

Interaction between the stratification due to salinity and suspended sediment and the turbulent flow plays an important role in the hydrodynamic, salinity and sediment transport in estuaries. At present, the salinity stratification and suspended sediment stratification have a lot of research results. However, the interaction mechanism between the stratification due to both suspended sediment and salinity and turbulence is still lack of understanding. Especially the turbulence model for reasonable description of the strong stratification near bed needs further research. The mechanism for the interaction between the stratification due to salinity-suspended sediment and the flow turbulence will be indicated by the oscillation-grid flume experiment and mesoscale numerical simulation. The turbulence model for the salinity and suspended sediment stratification will be proposed to lay a foundation for development of sediment transport model in estuary area. It is of important scientific significance and practical value for better understanding the phenomenon of high suspended sediment concentration near bottom in the Changjiang Estuary and predicting the sediment siltation in the deep-water channel of the Changjiang Estuary.