Author(s): J. Lambermont; G. Lebon

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Abstract: The erosion of visco-plastic cohesive soils under the action of a turbulent fluid flow is studied. The equations describing a sediment bed are discussed. To solve them, the density distribution in the bed must be known at some initial time. Experimental field studies and results from the ultracentrifuge provide a clear picture of the density distribution in sediment layers. The boundary condition between the bed-fluid interface is obtained from experimental observations. It is inferred that the instantaneous physico-chemical composition at the top of the bed is uniquely related to the bed shear stress during erosion. The solution for the stationary erosion flux under a constant shear stress is obtained. The erosion flux depends on the properties of the bed and the shear stress induced by the turbulent fluid flow. The theory is shown to agree very well with the experiments performed by PARTHENIADES (1965).

DOI: https://doi.org/10.1080/00221687809499630

Year: 1978