Author(s): Abily Morgan; Ozgen Ilhan; Berger Catherine; Amann Finn; Kipfer Andy; Gourbesville Philippe
Keywords: Benchmark; FloodArea HPC; FullSWOF＿2D; Guidelines for practitioners; Hms; Surface runoff
Abstract: For flood hazard assessment, numerical models aim at describing free surface behavior of floods according to an engineering description, to support decision makers. For practical flood modeling applications over urban areas, standard deterministic free surface hydraulic modeling approaches most commonly rely on code solving (or approaching solution of): (i) 2D Shallow Water Equations (SWE), (ii) simplified version of 2D SWE (e. g. diffusive wave approximation) or (iii) porous SWE. These approaches are different in terms of conceptualization and mathematical description of flow behavior. Suitability to apply one or another approach varies depending on objectives and available resources. This study performs a specific practical comparison of approaches (i), (ii) and (iii), when High Resolution (HR) topographic datasets, usually available in urban environments, are used for urban flood modeling in certain cases of high impact rainfallused. Results of the practical study provide guidelines for both practitioners and end users of flood risk modeling tools (e. g. decision makers) regarding added value, drawback/limitations and possibilities of these approaches.