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Aquifer Monitoring With DAS: A Case Study From Lyon Water Catchment

Description: 

Distributed Acoustic Sensing (DAS) arrays combined with passive seismic techniques provide a novel and effective method for subsurface imaging and monitoring. This study focuses on leveraging ambient seismic noise recorded by a spiral DAS array to monitor groundwater dynamics in a shallow aquifer. The research was conducted at the Crépieux-Charmy water catchment, a critical site for water supply in the Lyon metropolitan area, in France.

Our study aimed at tracking the spatiotemporal dynamics of the hydraulic dome induced by controlled infiltration in a basin. Over a period of four weeks, a controlled water infiltration experiment was carried out by the site operators. During this period, DAS ambient noise data were collected from a 3 km spiral fiber-optic array surrounding the infiltration basin. By analyzing traffic noise in the 2–20 Hz frequency band, we performed time-lapse 2D surface wave tomography to map velocity variations in the vadose zone.

The results showed a strong correlation between seismic velocity variations and independent piezometric measurements, highlighting changes in the water table and unsaturated zone water saturation. This pilot study demonstrates the potential of combining DAS with passive seismic for high-resolution monitoring of aquifer dynamics.

Session: Fiber-optic Sensing Applications in Seismology [Poster]

Type: Poster

Date: 4/15/2025

Presentation Time: 08:00 AM (local time)

Presenting Author: Destin

Student Presenter: No

Invited Presentation: 

Poster Number: 58

Authors