Author(s): Qianru Lin; Weiming Wu

Linked Author(s):

Keywords: Cohesive and non-cohesive sediment mixture; consolidation; flocculation; multiple-sized; one-dimensional model; open channel

Abstract: A one-dimensional model has been developed to simulate mixed cohesive and non-cohesive sediment transport in open channels. Flocculation is considered by determining the floc settling velocity as function of sediment size, concentration, and bed shear stress. The critical shear stress of cohesive sediment erosion is related to the dry bed density that varies with time due to consolidation, and the critical shear stress of non-cohesive sediments is corrected when the cohesive fraction exceeds a certain limit such as 10%. Cohesive and non-cohesive sediment transport, bed change and bed-material sorting equations are solved in a coupled form. The model is tested using two field cases of mixed sediment transport in the Lower Fox River in USA and the Three Gorges Reservoir in China. The calculated results agree generally well with measured data.

DOI: https://doi.org/10.1080/00221686.2013.812046

Year: 2013