Author(s): Qing Feng; Qianlu Xiao; Yanshuang Zheng
Linked Author(s): Qing Feng
Keywords: Cohesive sediment Experimental research Sediment transport capacity Montmorillonite
Abstract: The cohesive sediment in the middle reaches of the Yellow River mainly comes from the arsenic sandstone area of the Loess Plateau, among which the red arsenic sandstone rich in the viscous mineral montmorillonite is the main source of cohesive sediment. The hydrophilicity and special mineral structure of montmorillonite enable it to quickly integrate into sediment-laden flow and form hyper-concentrated flow during propagation. In order to clarify the mechanism of the influence of cohesive sediment on sediment transport capacity, experimental studies were conducted on the settling velocity of cohesive sediment particle, settling velocity of sediment groups, turbulence intensity of sediment-laden flow, and flow viscosity. The results showed that the presence of cohesive sediment is an indispensable factor in the formation of hyper-concentrated flow, which not only directly affects the settling velocity of suspended sediment, but also changes the energy dissipation mode of sediment-laden flow.
Year: 2025