摘要
The flocculation and the settling of the cohesive sediment play an important role in the sediment transport process,and they are affected by many factors.On the coasts and in the estuaries,the organic matter and the salinity are two significant factors.In this study,experiments are carried out to evaluate the flocculation and the settling of the kaolinite in cases of various organic matter and salinity solutions in quiescent waters.The optical multi-channel suspended concentration monitoring system is used to measure the sediment concentration and the floc size.The results show that the settling velocity decreases with the increase of the organic matter content,and the floc size increases with the increase of the organic matter content.In addition,an empirical formula for the settling velocity under the influence of the organic matter and the salinity based on the experimental results is proposed.
基金
supported by the National Key Research and Development Program of China(Grant No.2017YFC1404200)
the National Natural Science Foundation of China(Grant Nos.51579171,51679161 and 51909068)
supported by the Open Research Fund of State Key Laboratory of Hydraulic Engineering Simulation and Safety,Tianjin University(Grant No.HESS-1917)
the Belt and Road Special Foundation of the State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering(Grant No.2018490911).
