ANR projects

ANR DEUFI (DEtailing Urban Flood Impact) 2019-2024

• Coordinator: André Paquier (puis Sébastien Proust)
• Partners: INRAE (RiverLy, Lyon; UMR G-EAU, Montpellier); INSA Lyon; Hydrosciences Montpellier; Icube, Strasbourg; Cerema; Artelia, Échirolles;  LAGAM (LAboratoire de Géogra-
  phie et d’Aménagement de Montpellier); Université de Liège, Belgique; KICT, Corée. 
• Summary: Although urban flooding is widely studied, exchange flows between streets and buildings are poorly documented in the laboratory and in the field. The DEUFI project fills this gap by focusing on flooding at the individual scale, integrating the understanding of hydraulic
  processes inside and outside a building, and assessing how this knowledge can be useful for estimating damage and casualties. The DEUFI project proposes improved urban flood simulation methods capable of (i) estimating water intrusion into built-up areas, (ii) assessing the spatial distribution of human exposure and property damage, and (iii) defining recommendations on the best urban flood management methods to implement in relation to citizens' perceptions and attitudes during heavy (relatively short-lived) floods. In order to examine the influence of openings on flows in building blocks and along streets, three scales are studied: the façade (including one or more openings), the block (built-up area surrounded by streets and including one or more buildings) and the neighborhood (including several streets and numerous blocks). The information provided at one of these scales can be used to estimate the level of risk and make flood risk management decisions on an individual or collective scale. At the façade scale, the calculation of flow through openings is central, as it is the first step in estimating the influence of street/building exchanges on urban flooding. At the block scale, the difference between the hazard inside and outside the building is highlighted particularly for damage estimation, but the opening also creates a disturbance in the flood hazard in the street, which can be important for safety estimation. At the neighborhood scale, we study flow propagation and its uncertainty due to exchanges between streets and buildings, but also due to other factors (e.g. influence of boundary conditions); flood management strategy must be built on results at this scale.
• Final report

ANR DEAR (Deposition and Erosion of fine sediments in Alpine Rivers) 2019-2023

• Coordinator: Benoît Camenen
• Partners: INRAE (Lyon et Grenoble), IGE (Grenoble), et EDF CIH (Grenoble) et LNHE (Chatou)
• Summary: Alpine gravel-bed Rivers constrained by lateral dykes are characterised by alternate bars associated with a high sediment transport with particles ranging from gravels to clay. Human activity in the catchment area and along the river led to a lack of gravel input, while the finer classes are little affected. This imbalance often results in erosion of the main channel and fixation of the gravel bars, where massive deposits of fine sediments can occur together with colonisation by the riparian vegetation. This process, often irreversible, reduces the habitat quality and increases the risk of flooding. The main aim of this project is therefore to better understand how the dynamics of fine sediments in Alpine rivers depends on the hydrosedimentary forcing factors (flooding, spring melt, dam flushing) and what are their interactions with gravel bars and vegetation. Then, our objective is to provide keys to river managers to limit fine sediment deposition and the growth of pioneer vegetation.
• Final report

ANR FLOWRES (Prédire les écoulements dans les plaines d’inondation lors de crues extrêmes)