Towards water content monitoring in the vadose zone from active seismic

Ludovic Bodet (1) , Marine Dangeard (1) , Sylvain Pasquet (2) , Roger Guerin (3) , Damien Jougnot (1) , Laurent Longuevergne (4) , Agnès Rivière (5) , Julien Thiesson (1)

1 METIS - Milieux Environnementaux, Transferts et Interactions dans les hydrosystèmes et les Sols
2 UW - University of Wyoming
3 SISYPHE - Structure et fonctionnement des systèmes hydriques continentaux
4 GR - Géosciences Rennes
5 GEOSCIENCES - Centre de Géosciences

V P / V S or Poison’s ratio classically permit imaging fluids in rocks but this strategy remains underused in near- surface applications, hence in hydrogeophysics. Yet, P-wave refraction tomography and surface-wave dispersion inversion can be combined to produce 2D V P and V S sections from a single acquisition set up. This approach recently proved to be efficient in the study of various hydrosystems and in the imaging of the Critical Zone. We now suggest its time-lapse application in order to help the monitoring of water content in the vadose zone/aquifer continuum. With both laboratory experiments and field data, we show how the temporal variations of P-wave travel times and surface-wave dispersion are strongly associated to the variations of water content observed locally, thus encouraging to exploit the full wealth of seismic signals in hydrogeophysics.

Domaines: Hydrologie; Géochimie

Ludovic Bodet, Marine Dangeard, Sylvain Pasquet, Roger Guerin, Damien Jougnot, et al.. Towards water content monitoring in the vadose zone from active seismic. European Geosciences Union General Assembly 2017, Apr 2017, Vienne, Austria. Geophysical Research Abstracts, 19, pp.EGU2017-13355, 2017. ⟨insu-01534138⟩