The VOLNA code for the numerical modelling of tsunami waves: generation, propagation and inundation
Résumé
A novel tool for tsunami wave modelling is presented. This tool has the potential of being used for operational purposes: indeed, the numerical VOLNA code is able to handle the complete life-cycle of a tsunami (generation, propagation and run-up along the coast). The algorithm works on unstructured triangular meshes and, thus, can be run in arbitrary complex domains. It is often the case since natural coasts tend to be of fractal shape [Sapoval et al, 2004]. This paper contains the detailed description of the finite volume scheme implemented in the code. We explain the numerical treatment of the wet/dry transition. This point is crucial for accurate run-up computation. Most existing tsunami codes use semi-empirical techniques at this stage, which are not always sufficient. The main reason is that people evacuation is decided on the base of inundation maps which are produced with this type of numerical tools. Finally we present several realistic test cases that partially validate our algorithm. Comparisons with analytical solutions and experimental data are performed. Finally the main conclusions are outlined and the perspectives for future research presented.
Domaines
Mécanique des fluides [physics.class-ph] Mécanique des fluides [physics.class-ph] Océanographie Hydrologie Milieux et Changements globaux Physique Numérique [physics.comp-ph] Dynamique des Fluides [physics.flu-dyn] Analyse numérique [math.NA] Equations aux dérivées partielles [math.AP] Milieux fluides et réactifs Océan, Atmosphère Géophysique [physics.geo-ph] Géophysique [physics.geo-ph]
Origine : Fichiers produits par l'(les) auteur(s)