Modelling of flood inundation due to levee breaches : sensitivity of flood inundation against breach process parameters

This paper analyses the sensitivity of flood inundation due to river levee breach against breach process parameters using the 1996 Awash River levee breach case at Wonji, Ethiopia. A parametric levee breach model integrated into the 2D hydrodynamic numerical model Telemac-2D is used to simulate a levee breach flood event at Wonji, Ethiopia. Levee breach process parameters are systemically varied to find out their effect on the flood inundation. The analysis of the model results shows that the flood inundation is sensitive to the final breach dimensions and breach location. However, the parameters describing the levee breach development have negligible influence on the flood inundation. This implies that final breach dimension and breach location in an event of levee breach are the most important and decisive parameters affecting the resulting inundation of the flood plain, and as such should be given due consideration when creating flood inundation maps due to levee breach.

Subjects

levee breach

levee breach model parameters

flood modelling

Telemac-2D

DDC Class

550: Geowissenschaften

600: Technik

620: Ingenieurwissenschaften

710: Landschaftsgestaltung, Raumplanung

Funding(s)

Publikationsfonds 2020

More Funding Information

Deutschland, Bundesministerium für Bildung und Forschung

Publication version

publishedVersion

Lizenz

https://creativecommons.org/licenses/by/4.0/

Name

water-12-03566-v2.pdf

Size

5.62 MB

Format

Adobe PDF

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Modelling of flood inundation due to levee breaches : sensitivity of flood inundation against breach process parameters