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以长江口细颗粒泥沙为样本进行环形水槽起动试验,给出了三组不同中值粒径泥沙的起动流速和临界起动应力,同时用湍动能法(TKE)估算不同含沙量水体的床面切应力,给出了泥沙起动过程中床面切应力与含沙量之间的关系。床面切应力随着含沙量的增加而增加,当含沙量达到某一浓度后,床面切应力增长缓慢,随着含沙量的再增加,床面切应力再次迅速增高,而不同中值粒径的泥沙,增长速度并不一致,说明泥沙对床面切应力的影响并不仅仅表现在含沙量上,粒径大小也是影响床面切应力的重要因子之一。
Taking the fine sediment of the Yangtze River estuary as sample, the starting experiment of annular flume was carried out. The starting flow velocity and critical starting stress of three sets of sediment with different median grain size were given. The turbulent kinetic energy (TKE) The relationship between bed shear stress and sediment concentration in sediment start-up process is given. The bed shear stress increases with the increase of sediment concentration. When the sediment concentration reaches a certain concentration, the bed shear stress increases slowly. As the sediment concentration increases, the bed shear stress increases rapidly again, The median diameter of sediment, the growth rate is not consistent, indicating that sediment on the bed shear stress is not only reflected in the sediment concentration, particle size is also one of the important factors affecting the bed shear stress.