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Communication Dans Un Congrès Année : 2022

Benefit of coupling 1d-2d model over an urban area to assess runoff during a storm event

Résumé

Stormwater or rainwater networks are essential infrastructures in urban areas to reduce the runoff during storm events. In recent years, several storm events occurred in France especially in Mediterranean regions leading to severe urban floods, mainly due to the capacity of storm network to cope with runoff generated by extreme rainfall events. Therefore, flood risk analysis is essential to identify vulnerable areas. To do so, numerical modelling tools can be used to assess the performance and potential limitation of storm networks efficiency during heavy rainfall events. One-dimensional (1D) stormwater models are assessment tools commonly used, as they are easy to build, efficient and their computation time is fast. However, 1D model only predicts the overflow from the stormwater system which is transmitted to the surface. The runoff is not considered and therefore the vulnerability of the flood event is not assessed by a simplified approach. To overcome this limitation, tools able to couple the storm network (1D) with the surface runoff (2D) have been developed. Such tools potentially enable a better understanding of the interconnected issues in the domain of storm water management and urban runoff (network overflows, runoff inflows). The objective of the study is to evaluate the benefit of coupling 1D and 2D models to assess the flood management in an urban area. To do so, a 1D stormwater network and a 2D hydraulic runoff network will be built with InfoWorks ICM. The study compares the results obtained with modelling of pluvial and storm flooding in 1D/1D and 1D/2D models to investigate the importance of linking the surface and sub-surface drainage domain in a small area in Nice (France). The results highlight the benefice of coupled 1D/2D model in vulnerable area.
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hal-03914226 , version 1 (28-12-2022)

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Nathalie Bertrand, Morgan Abily, Malo Lambert, Olivier Delestre. Benefit of coupling 1d-2d model over an urban area to assess runoff during a storm event. SimHydro2021 : Models for complex and global water issues - Practices and expectations - 6th International Conference, SHF, Jun 2021, Nice (Sophia Antipolis), France. pp.315-328, ⟨10.1007/978-981-19-1600-7_20⟩. ⟨hal-03914226⟩
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