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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Sediment management and morphodynamics : An improved two-phase flow model for steady uniform sheet-flow based on dense granular flow rheology
An improved two-phase flow model for steady uniform sheet-flow based on dense granular flow rheology
Author : Julien Chauchat1, Thibaud Revil-Baudard2, David Hurther3
ABSTRACT
The sheet flow regime of sediment transport is associated with very strong flow forcing and very high sediment transport rate.
Improving the modelling of this regime is of primarily importance for a better prediction of the morphological evolution of riverine
and coastal systems. During the last decades an important research effort has been devoted to the development of process-based
models for unidirectional and oscillatory sheet flows. In recent contributions we have developed a novel two-phase sheet flow
model and a new experimental set-up to acquire high-resolution measurements of collocated velocity and concentration profiles
under unidirectional, steady and uniform sheet flow conditions. The original two-phase flow two-layer model is further developped
as a single layer model in the present contribution. This model is based on a mixing length approach for modelling the turbulent
Reynolds shear stress and on a modified dense granular flow rheology for the modelling of granular shear and normal stresses.
The developped two-phase flow model is compared with the novel dataset presented above in terms of streamwise velocity and
concentration profiles demonstrating the relevancy of the proposed modeling approach.
File Size : 356,983 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Sediment management and morphodynamics
Date Published : 18/08/2015
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