Séminaire ISTerre

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Monitoring groundwater in the critical zone with Distributed Acoustic Sensing (DAS): Application to the alluvial aquifer of Crépieux-Charmy (Lyon, France).

jeudi 9 novembre 2023 - 11h00

Destin Nziengui Bâ - ISTerre/FEBUS Optics
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Groundwater is a vital component of many natural ecosystems and an important resource for human activities worldwide. However, the state and dynamics of water-bearing aquifers remain uncertain, mainly due to the lack of detailed subsurface data at high spatial and temporal resolution. In my talk, I will discuss about the potential of using urban seismic noise, captured by fiber-optic Distributed Acoustic Sensing (DAS) arrays, as a means to monitor seismic velocity variations caused by groundwater level changes in the vadose zone. We showcase our methodology in the water supply field of Crépieux-Charmy (Lyon, France), which pumps water in a shallow unconfined alluvial aquifer. We were able to obtain time-lapse maps of Love wave velocity variations that correlate perfectly with groundwater changes. Our results suggest that DAS combined with ambient noise interferometry provides a means of tracking aquifer dynamics at high spatial and temporal resolutions relevant for effective groundwater resource management.

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Equipe organisatrice : Ondes et structures

Amphithéâtre Killian, Maison des Géosciences, 38400 Saint Martin d'Hères

Informations de visio :

https://univ-grenoble-alpes-fr.zoom.us/j/8172559109
ID de réunion : 817 255 9109