Inferring field-scale properties of a fractured aquifer from ground surface deformation during a well test - Archive ouverte HAL Access content directly
Journal Articles Geophysical Research Letters Year : 2015

Inferring field-scale properties of a fractured aquifer from ground surface deformation during a well test

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Jonathan Schuite
Laurent Longuevergne
Olivier Bour
  • Function : Author
  • PersonId : 961873
Frédéric Boudin
  • Function : Author
  • PersonId : 839852
Nicolas Lavenant
  • Function : Author
  • PersonId : 944612
Stéphane Durand

Abstract

Fractured aquifers which bear valuable water resources are often difficult to characterize with classical hydrogeological tools due to their intrinsic heterogeneities. Here, we implement ground surface deformation tools (tiltmetry and optical leveling) to monitor groundwater pressure changes induced by a classical hydraulic test at the Ploemeur observatory. By jointly analyzing complementary time constraining data (tilt) and spatially constraining data (vertical displacement), our results strongly suggest that the use of these surface deformation observations allows for estimating storativity and structural properties (dip, root depth, lateral extension) of a large hydraulically active fracture, in good agreement with previous studies. Hence, we demonstrate that ground surface deformation is a useful addition to traditional hydrogeological techniques and opens possibilities for characterizing important large-scale properties of fractured aquifers with short-term well tests as a controlled forcing.
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Dates and versions

insu-01247513 , version 1 (05-02-2016)

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Jonathan Schuite, Laurent Longuevergne, Olivier Bour, Frédéric Boudin, Nicolas Lavenant, et al.. Inferring field-scale properties of a fractured aquifer from ground surface deformation during a well test. Geophysical Research Letters, 2015, 42 (24), pp.10696-10703. ⟨10.1002/2015GL066387⟩. ⟨insu-01247513⟩
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