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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Sediment management and morphodynamics : On the role of modelling approach for simulation of bank erosion in straight, trapezoidal channel
On the role of modelling approach for simulation of bank erosion in straight, trapezoidal channel
Author : LUKAS VONWILLER(1), DAVID F. VETSCH(2) & ROBERT M. BOES(3)
ABSTRACT
Numerical models for the simulation of morphological changes in natural rivers have to account for bank erosion. This
dynamic erosion process depends on the critical shear stress of the bank material, the flow and gravity-induced lateral
transport, and the bank failure mechanism. To take bank erosion in a numerical model into account, different model
concepts have to be considered and combined. We use a numerical depth-averaged 2-d model to simulate bank erosion
in a straight trapezoidal channel with non-cohesive material based on Ikeda¡¯s laboratory experiments. The bed load
transport model includes Ikeda¡¯s lateral transport approach and a geometrical approach for bank failure including the
definition of the angle of repose for dry and submerged material. We study the role of these modelling approaches and
the sensitivity of important model parameters. Interestingly, not only is lateral transport important, but also bank failure
plays a crucial role. The most sensitive parameters for bank failure and the overall progressive erosion process are the
angle of repose, the pre-factor of the sediment transport formula, the pre-factor of the lateral transport approach, and the
grid resolution. By calibration of these parameters the results of the numerical model agree well with the experimental
data. In particular, the dynamics of the lateral erosion and the aggradation of the channel bed are well captured.
However, the model results strongly depend on the discretization of the computational grid. To overcome this
shortcoming, alternative approaches are discussed in this contribution.
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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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