Innovative Field Methods for Characterizing the Hydraulic Properties of a Complex Fractured Rock Aquifer (Ploemeur, Brittany) - INSU - Institut national des sciences de l'Univers Access content directly
Conference Papers Year : 2014

Innovative Field Methods for Characterizing the Hydraulic Properties of a Complex Fractured Rock Aquifer (Ploemeur, Brittany)

Olivier Bour
  • Function : Author
  • PersonId : 961873
Tanguy Le Borgne
  • Function : Author
  • PersonId : 905951
Laurent Longuevergne
Nicolas Lavenant
  • Function : Author
  • PersonId : 944612
Jean-Raynald de Dreuzy
Jonathan Schuite
Frederick Boudin
  • Function : Author
  • PersonId : 862912
Luc Aquilina
  • Function : Author
  • PersonId : 841705

Abstract

Characterizing the hydraulic properties of heterogeneous and complex aquifers often requires field scale investigations at multiple space and time scales to better constrain hydraulic property estimates. Here, we present and discuss results from the site of Ploemeur (Brittany, France) where complementary hydrological and geophysical approaches have been combined to characterize the hydrogeological functioning of this highly fractured crystalline rock aquifer. In particular, we show how cross-borehole flowmeter tests, pumping tests and frequency domain analysis of groundwater levels allow quantifying the hydraulic properties of the aquifer at different scales. In complement, we used groundwater temperature as an excellent tracer for characterizing groundwater flow. At the site scale, measurements of ground surface deformation through long-base tiltmeters provide robust estimates of aquifer storage and allow identifying the active structures where groundwater pressure changes occur, including those acting during recharge process. Finally, a numerical model of the site that combines hydraulic data and groundwater ages confirms the geometry of this complex aquifer and the consistency of the different datasets. The Ploemeur site, which has been used for water supply at a rate of about 106 m3 per year since 1991, belongs to the French network of hydrogeological sites H+ and is currently used for monitoring groundwater changes and testing innovative field methods.

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Earth Sciences
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Dates and versions

insu-01088596 , version 1 (28-11-2014)

Identifiers

  • HAL Id : insu-01088596 , version 1

Cite

Olivier Bour, Tanguy Le Borgne, Laurent Longuevergne, Nicolas Lavenant, Joaquin Jimenez-Martinez, et al.. Innovative Field Methods for Characterizing the Hydraulic Properties of a Complex Fractured Rock Aquifer (Ploemeur, Brittany). AGU Fall Meeting 2014, American Geophysical Union, Dec 2014, San Francisco, United States. pp.H51P-01. ⟨insu-01088596⟩
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