Numerical modelling of non-cohesive embankment breach with the dual-mesh approach / Christian Volz in Journal of hydraulic research, Vol. 50 N° 6 (Novembre/Décembre 2012)  

Public ISBD [article]  inJournal of hydraulic research > Vol. 50 N° 6 (Novembre/Décembre 2012) . - pp. 587-598 Titre : Numerical modelling of non-cohesive embankment breach with the dual-mesh approach Type de document : texte imprimé Auteurs : Christian Volz, Auteur ; Patric Rousselot, Auteur ; David Vetsch, Auteur Année de publication : 2013 Article en page(s) : pp. 587-598 Note générale : Hydraulique Langues : Anglais (eng) Mots-clés : Dual-mesh Embankment breach Overtopping Sediment transport Shallow-water equation Slope failure Résumé : The numerical model BASEMENT, based on the two-dimensional shallow-water equations, is applied to breaching processes of non-cohesive earth embankments due to overtopping. The governing equations are solved using an explicit finite-volume method combined with a Godunov-type approach. For spatial discretization, a mass-conserving dual-mesh approach with separate, unstructured meshes for hydrodynamic and sediment computations is developed allowing for accurate terrain representation. The surface erosion is modelled with the Exner and sorting equations for multiple grain classes in combination with empirical bed-load transport formulas and advection–diffusion equations for suspended-load transport. Additionally, the lateral breach widening caused by gravitationally-induced slope failures is considered using a novel algorithm adapted for unstructured grids. The model is successfully applied to two recent laboratory experiments including plane and spatial dike breaches, and a field-scale embankment breach. Detailed comparisons between measured and simulated laboratory spatial breach formations confirm the basic model assumptions. ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/full/10.1080/00221686.2012.732970 [article] Numerical modelling of non-cohesive embankment breach with the dual-mesh approach [texte imprimé] / Christian Volz, Auteur ; Patric Rousselot, Auteur ; David Vetsch, Auteur . - 2013 . - pp. 587-598. Hydraulique Langues : Anglais (eng) in Journal of hydraulic research > Vol. 50 N° 6 (Novembre/Décembre 2012) . - pp. 587-598 Mots-clés : Dual-mesh Embankment breach Overtopping Sediment transport Shallow-water equation Slope failure Résumé : The numerical model BASEMENT, based on the two-dimensional shallow-water equations, is applied to breaching processes of non-cohesive earth embankments due to overtopping. The governing equations are solved using an explicit finite-volume method combined with a Godunov-type approach. For spatial discretization, a mass-conserving dual-mesh approach with separate, unstructured meshes for hydrodynamic and sediment computations is developed allowing for accurate terrain representation. The surface erosion is modelled with the Exner and sorting equations for multiple grain classes in combination with empirical bed-load transport formulas and advection–diffusion equations for suspended-load transport. Additionally, the lateral breach widening caused by gravitationally-induced slope failures is considered using a novel algorithm adapted for unstructured grids. The model is successfully applied to two recent laboratory experiments including plane and spatial dike breaches, and a field-scale embankment breach. Detailed comparisons between measured and simulated laboratory spatial breach formations confirm the basic model assumptions. ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/full/10.1080/00221686.2012.732970

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