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Title: Breach modelling by overflow with TELEMAC 2D: Comparison with large-scale experiments

Author
item LAROCHE, CHRISTOPHE - Cerema (centre D'Études Et D'expertise Sur Les Risques, L'environnement, La Mobilité Et L'aménageme
item AKQUIER, MATHIEU - Cerema (centre D'Études Et D'expertise Sur Les Risques, L'environnement, La Mobilité Et L'aménageme
item FLORIANA, FANNY
item Tejral, Ronald

Submitted to: Workshop Proceedings
Publication Type: Proceedings
Publication Acceptance Date: 7/1/2016
Publication Date: 10/20/2016
Citation: Laroche, C., Akquier, M., Floriana, F., Tejral, R.D. 2016. Breach modelling by overflow with TELEMAC 2D: Comparison with large-scale experiments. 3rd European Conference on Flood Risk Management, October 17-21, 2016, Lyon, France. https://doi.org/10.1051/e3sconf/20160704001. 9 p..

Interpretive Summary:

Technical Abstract: An erosion law has been implemented in TELEMAC 2D to represent the surface erosion process to model the breach formation of a levee. We focus on homogeneous and earth fill levee to simplify this first implementation. The first part of this study reveals the ability of this method to represent simultaneously both formations of the breach and the scour hole at the rear of the levee. The resistance of the levee seems consistent with the resistance of the soil material given by a standard classification. But this first part has shown that the lateral development of the breach cannot be represented. In the second part of this study, a simple widening of the breach method, based on continuous surface erosion process, has been implemented. The comparison with large-scale experiments shows that both dynamics of the breach formation and the width are not correctly estimated by surface erosion process. Further developments are required to integrate the headcut erosion process and mass failure as sliding of the sides of the breach or undercutting.