Time Lapse Survey
Friday 18 December 2009 by Thomas Lebourg

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Evolution in time of a pseudo-section and subsurface hydraulic response to a rainfall event

- 1 profile per day over a 13 day period -

Evolution in time of a pseudo-section and subsurface hydraulic response to a rainfall event

- 2 profiles per day over a 15 day period -

Low resistivity zones (in blue color, in green color) can be observed that change with water circulation in the massif. Modelling allows to highlight channels in the sliding mass and water transfer toward the faults dividing up the massif. Water transfer toward faults indicates large-scaled interaction between deep groundwater and surface groundwater which matters in the slope movements.

Comparison between average resistivity, pluviometry and piezometry from fall 2007 to spring 2009

A relationship between rainfall and the hydrogeophysical signal can be observed. Rainfall events generate a raise of the watertable level that can be related to a fall of resistivity due to the increase of soil conductivity as a result of water contribution.

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