Wei Huang, Ya-Kun Liu, Hua-Lin Wu, Yuan-Yang Wan
School of Hydraulic Engineering, Dalian University of Technology, Dalian, 116024, China.
Key Laboratory of Estuarine & Coastal Engineering of Ministry of Transport, Shanghai Estuarine and Coastal Science Research Center, Shanghai, 201201, China.
Sci Rep. 2017 Oct 16;7(1):13285. doi: 10.1038/s41598-017-13651-2.
In this study, annular flume experiments are carried out, using the sediment samples collected from Yangtze estuary. The incipient velocity and the incipient shear stress of three different groups of median grain size of sediment are given. The turbulent kinetic energy method (TKE) is used to determine the bed shear stress (τ), by evaluating variations in the suspended sediment concentration (SSC) within the water column. The suspended sediment concentration increases with the increase of the bed shear stress. When the sediment concentration reaches a certain concentration, the rate of change in τ obviously slows down. As the concentration increasing again, the bed shear stress grows rapidly with different growth rate attributed to different grain size. The results of the experiments indicate that SSC and grain size have strong influence on τ.
在本研究中，利用从长江河口采集的沉积物样本进行了环形水槽实验。给出了三组不同中值粒径沉积物的起动流速和起动切应力。采用湍动能法（TKE），通过评估水柱内悬浮泥沙浓度（SSC）的变化来确定床面切应力（τ）。悬浮泥沙浓度随床面切应力的增加而增加。当泥沙浓度达到一定浓度时，τ的变化速率明显减慢。随着浓度再次增加，床面切应力以不同的增长率快速增长，这归因于不同的粒径。实验结果表明，SSC和粒径对τ有很大影响。
