Proceedings/Recueil Des Communications Année : 2022

A new methodology for the assessment of flood hazard in urban areas due to levee breaches

Résumé

The objective of this study is to propose a new methodology for the assessment of flood hazard induced by the formation of levee breaches due to overtopping flows. The proposed methodology relies on the definition of a new breach model and on the flood hazard assessment (i.e. water height in area of interest) through a deterministic simulation. The methodology is implemented in the open-source hydrodynamic suite of solvers TELEMAC-MASCARET (www.opentelemac.org) and applied to the Loire river using the two-dimensional (2D) depth-averaged hydrodynamic code TELEMAC-2D. We chose a flood scenario corresponding to a return period of around 500 years and we compared results to those obtained by performing 3,000 Monte-Carlo simulations using uniform distribution of the model parameters. Results suggest that the deterministic simulation should be completed by a set of well-chosen deterministic scenarios in order to cover the large uncertainty showed by the computational costly Monte-Carlo simulations.

Dates et versions

hal-04993256 , version 1 (16-03-2025)

Identifiants

Citer

Vito Bacchi, Cédric Goeury, Fabrice Zaoui, Kamal El Kadi Abderrezzak, Sophie Bacchi, et al.. A new methodology for the assessment of flood hazard in urban areas due to levee breaches. Proceedings of the 39th IAHR World Congress From Snow to Sea, Jun 2022, Granada, Spain. International Association for Hydro-Environment Engineering and Research (IAHR), pp.6672-6679, 2022, ⟨10.3850/IAHR-39WC2521711920221210⟩. ⟨hal-04993256⟩
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