Ata, Riadh

El Kadi Abderrezzak, Kamal

Kheloui, Lydia

English

Hydraulic Engineering Repository

Conference Paper, Published VersionKheloui, Lydia; Ata, Riadh; El Kadi Abderrezzaki, KamalNumerical investigation of non-cohesive fluvial dikebreaching induced by flow overtoppingZur Verfügung gestellt in Kooperation mit/Provided in Cooperation with:TELEMAC-MASCARET Core GroupVerfügbar unter/Available at: https://hdl.handle.net/20.500.11970/107191Vorgeschlagene Zitierweise/Suggested citation:Kheloui, Lydia; Ata, Riadh; El Kadi Abderrezzaki, Kamal (2019): Numerical investigation ofnon-cohesive fluvial dike breaching induced by flow overtopping. In: XXVIth TELEMAC-MASCARET User Conference, 15th to 17th October 2019, Toulouse.Standardnutzungsbedingungen/Terms of Use:Die Dokumente in HENRY stehen unter der Creative Commons Lizenz CC BY 4.0, sofern keine abweichendenNutzungsbedingungen getroffen wurden. Damit ist sowohl die kommerzielle Nutzung als auch das Teilen, dieWeiterbearbeitung und Speicherung erlaubt. Das Verwenden und das Bearbeiten stehen unter der Bedingung derNamensnennung. Im Einzelfall kann eine restriktivere Lizenz gelten; dann gelten abweichend von den obigenNutzungsbedingungen die in der dort genannten Lizenz gewährten Nutzungsrechte.Documents in HENRY are made available under the Creative Commons License CC BY 4.0, if no other license isapplicable. Under CC BY 4.0 commercial use and sharing, remixing, transforming, and building upon the materialof the work is permitted. In some cases a different, more restrictive license may apply; if applicable the terms ofthe restrictive license will be binding.Verwertungsrechte: Alle Rechte vorbehaltenNumerical investigation of non-cohesive fluvial dike breaching induced by flow overtopping Lydia KHELOUI1,2, Riadh ATA1,2, Kamal EL KADI ABDERREZZAK1,2 1 EDF R&D, National Laboratory for Hydraulics and Environment, Chatou, France 2 Saint Venant Laboratory for Hydraulics, Chatou, France lydia-l.kheloui@edf.fr, Riadh.ata@edf.fr, kamal.el-kadi-abderrezzak@edf.fr    Fluvial dike breaching is a great concern for Nuclear Power Plants’ safety and areas surrounding rivers.  Due to overtopping flows, river dikes considered as defense structures, can fail and lead to devastating inundations with dramatic human and economic losses. It is therefore of great importance, for flood risk management and prevention, to provide a reliable prediction of the breach expansion and outflow hydrograph. In this study, we investigate the use of two different numerical models to simulate breach growth in non-cohesive, homogeneous fluvial dikes with the open source TELEMAC-MASCARET suite of solvers. First, a two-dimensional (2D) depth-averaged morphodynamic model is discussed. Exner equation is used to update bed elevation and sediment transport rate is computed with an empirical formula. The model also incorporates a bank failure operator, a correction of the sediment transport magnitude and direction for the bed slope effect, and a correction of the bottom shear stress direction for the secondary current effect. In the second model, the hydrodynamic solver TELEMAC-2D is used with specific empirical formulas to determine the evolution of breach characteristics. Both approaches are employed to simulate laboratory flume experiments for which 3D evolving dike geometry and time series of breach outflow and water levels in the main channel were recorded.   Proposed session: River and urban floods, flood forecasting and management Key words: Breach, fluvial dike, non-cohesive material, overtopping, numerical models. Speaker: Lydia KHELOUI   

Numerical investigation of non-cohesive fluvial dike breaching induced by flow overtopping

http://henry.baw.de/bitstream/20.500.11970/107191/1/43_Kheloui_2019_Abstract.pdf

Numerical investigation of non-cohesive fluvial dike breaching induced by flow overtopping

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