The Chagnon sediment deposition area (France)

Design of a solid transport retention structure on the Chagnon torrent

Client: Commune de Vars - Model scale: 1:50

Context

It is planned to carry out a deposit beach on the Chagnon upstream of its confluence with the Chagne in order to limit the solid contribution in flood and thus reduce the risk of flooding to protect local issues.

Aims of the physical scale model

The physical model aims to:

• Size the outlet structure of the deposit range
• Check the efficiency of the deposition range
• Present to elected officials, partners and local actors the best technical solution, on a concrete tool.

Description of the physical scale model

• Continuous sediment inflow and stream flow based on stepped hydrographs
• Modelling of the 100-year floodFloating debris inflow
• Floating debris inflow
• Erodable bed in sections
• Continuous measurement of outgoing sediment discharge