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Towards the Wetness Characterization of Soil Subsurface Using Fibre Optic Distributed Acoustic Sensing

Abstract : Active seismic methods combined with detectors deployed at the soil surface, such as vertical collinear geophones, have revealed great potential for hydrogeophysical characterization of the soil vadose zone. In particular, recent findings have highlighted a clear dependence of both P-waves arrival times and surface-wave dispersion on the local degree of soil saturation, visible at laboratory as well as at field scale. In this study, we investigate the sensitivity of a fibre optic Distributed Acoustic Sensor (DAS) to different soil saturation. In vertical seismic applications, DAS have proven to offer equal and often better performance compared to the geophones, with the advantage that a fibre optic cable, whose length can reach 40 km, replaces the array of geophones as sensing element. We present the response to active seismic tests of 20 m of fibre optic cable buried in a poorly permeable bare soil. Tests were conducted in different moments of the year, with saturation monitored by means of independent dielectric probes. Body-wave travel times as well as surface-wave dispersion are compared. Finally, we discuss the possibility to determine a site-specific relation between the Poisson ratio and the soil saturation. This research has been performed in the framework of the British National Environmental Research Council (NERC) funded Distributed intelligent Heat Pulse System (DiHPS) project and of the Marie Curie H2020 Research and Innovation Staff Exchange (RISE) consortium Hi-Freq.
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https://hal-insu.archives-ouvertes.fr/insu-01734940
Contributor : Isabelle Dubigeon <>
Submitted on : Thursday, March 15, 2018 - 11:29:12 AM
Last modification on : Friday, September 18, 2020 - 2:34:54 PM

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  • HAL Id : insu-01734940, version 1

Citation

Francesco Ciocca, Ludovic Bodet, Nataline Simon, Rumen Karaulanov, Et Al.. Towards the Wetness Characterization of Soil Subsurface Using Fibre Optic Distributed Acoustic Sensing . American Geophysical Union Fall Meeting 2017, Dec 2017, New Orleans, United States. pp.H21A-1423. ⟨insu-01734940⟩

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