Predicting the flow in the floodplains with evolving land occupations during extreme flood events (FlowRes ANR project)

Prédire les écoulements dans les plaines d'inondations dont l'occupation du sol varie lors de crues extrêmes (Projet ANR FlowRes)

Sébastien Proust (1) , Céline Berni (1) , Martin Boudou (1) , Antoine Chiaverini (1) , Victor Dupuis (1) , Jean-Baptiste Faure (1) , André Paquier (1) , Michel Lang (1) , Sebastian Guillen Ludena (2) , Diego Lopez (2) , Emmanuel Mignot (2) , Nicolas Riviere (2) , Loic Chagot (3) , Maxime Rouzes (3) , Frédéric Moulin (3) , Nicole Goutal (4) , Marina Oukacine (4) , Yann Peltier (4) , Rui M.L. Ferreira (5) , Moisés Brito (6) , Elsa Alves (7) , Miltiadis Gymnopoulos (7) , Joao Leal (8) , Bastien Mathurin (9) , Sandra Soarez Frazao (9) , Didier Bousmar (10) , Joao Fernandes (11) , Olivier Eiff (12)

1 UR HHLY - Hydrologie-Hydraulique
2 LMFA - Laboratoire de Mecanique des Fluides et d'Acoustique
3 IMFT - Institut de mécanique des fluides de Toulouse
4 LHSV - Laboratoire d'Hydraulique Saint-Venant / Saint-Venant laboratory for Hydraulics
5 Instituto Superior Técnico
6 IST - Instituto Superior Técnico, Universidade Técnica de Lisboa
7 LNEC - Laboratório nacional de engenharia civil [Lisboa] = National Laboratory for Civil Engineering [Lisbon] = Laboratoire national de génie civil [Lisbonne]
8 UIA - University of Agder
9 UCL - Université Catholique de Louvain = Catholic University of Louvain
10 Service Public de Wallonie
11 D-INFK - Department of Computer Science [ETH Zürich]
12 KIT - Karlsruher Institut für Technologie

Flood hazards (flow depth and velocity) must be accurately assessed in high-risk areas during extreme flood events. However, the prediction of the very high flows is not an easy task due to the lack of field data and to the strong link between flow resistance and the land occupation of the floodplain. Confinement and inhomogeneity in lateral and longitudinal directions of hydraulic roughness strongly vary with return period T. The physical processes are complex, some still largely unexplored, and the assumptions linked to numerical modelling cannot be validated without field data. The FlowRes project (2015-2018), funded by the French National Research Agency (ANR), aims at improving the flood hazard assessment in floodplains in: 1) investigating in laboratory the hydrodynamic structure associated with extreme flood flows for various land occupations and flow discharge magnitudes; 2) assessing if the existing numerical modelling practices used for T ~ 100 years are still valid for extreme events with T > 1000 years, relying on the experimental

Mots clés: land occupation; floodplains; flooding; roughness; numerical model; laboratory test

Mots clés: RUGOSITE; MODELE NUMERIQUE; ESSAI AU LABORATOIRE; INONDATION; PLAINE D'INONDATION; OCCUPATION DU SOL

Domaines: Sciences de l'environnement

Sébastien Proust, Céline Berni, Martin Boudou, Antoine Chiaverini, Victor Dupuis, et al.. Predicting the flow in the floodplains with evolving land occupations during extreme flood events (FlowRes ANR project). 3rd European Conference on Flood Risk Management, Oct 2016, Lyon, France. 12 p. ⟨hal-01585278⟩