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Journal Articles Water Science and Technology Year : 2006

Comparison of numerical and experimental simulations of a flood in a dense urban area

Comparaison de simulations expérimentales et numériques de l`inondation d`une zone fortement urbanisée

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Emmanuel Mignot
André Paquier
T. Ishigaki
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Abstract

Although various numerical methods were used to simulate real floods occurring in cities, the validation of the models was never accurate because of the lack of data about location and event description and about observation for validation. In order to check the capacities of our 2-dimensional shallow water equations model to simulate an urban flood, we then decided to simulate numerically an experimental event with well known characteristics and accurate flow measurements. The physical model presented in (Ishigaki T. et al., 2003) represents the flooding of the city center of Kyoto in Japan due to an overflow from the Kamo river. The 2-dimensional numerical simulation of this event was then set up and the experimental and computed data were compared. It appears that the event was calculated quite fairly in terms of flow depth and flow rates in the streets and in terms of timing. However, some discrepancies appear between the measurements and the numerical results, mostly due to some topographical local uncertainties and to the capacities of the equations to model the complex flows in the crossroads.
Bien que divers codes de calculs 2D aient déjà été utilisés afin de simuler les inondations urbaines dans des zones urbanisées, aucune validation précise de ces modèles numériques n`est disponible. La méthode de validation proposée dans cet article consiste à simuler une inondation préalablement étudiée expérimentalement par (Ishigaki T. et al., 2003) et qui représente l`inondation du centre ville de Kyoto au Japon. La simulation numérique de cet événement expérimental et la comparaison des données calculées avec les données mesurées permet en effet de vérifier les capacités du code de calcul 2D à simuler un tel événement. Il apparaît que la dynamique de l`inondation ainsi que la plupart des détails de l`écoulement sont bien reproduits numériquement, même si une incertitude subsiste concernant notamment des incertitudes topographiques locales.

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Dates and versions

hal-02586495 , version 1 (15-05-2020)

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Emmanuel Mignot, André Paquier, T. Ishigaki. Comparison of numerical and experimental simulations of a flood in a dense urban area. Water Science and Technology, 2006, 54 (6-7), pp.65-73. ⟨hal-02586495⟩

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