Compréhension expérimentale et numérique des chemins de l'eau sur l'ensemble du champ captant de la Métropole de Lyon

A study on the Historic Site of Lyon reveals that artificial recharge basins, used to create hydraulic barriers for contamination protection, only maintain their effect for 1-2 days after cessation. This finding underscores the transient nature of such protective measures and highlights the need for continuous monitoring. The research employed a multi-faceted approach combining in-situ observations, experimental infiltration tests, thermal tracing, and 3D hydro-thermal modeling to characterize groundwater flow and heat transfer within Lyon's 375-ha aquifer system. Key insights include the identification of an infiltrability index that tracks basin performance over time, revealing progressive clogging due to sand layer compaction. The study also confirmed the presence of unsaturated zones and complex 3D flow dynamics beneath the Vieux-Rhône river, providing critical data for managing water resources under potential climate change scenarios.

Réfloch, A. Compréhension expérimentale et numérique des chemins de l’eau sur l’ensemble du champ captant de la Métropole de Lyon. https://doi.org/10.70675/704f13ccz5b25z4f7bzabcfz22695aaa0710