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Poster communications

TDIP imaging of watershed over crystalline basement

Abstract : Aquifers located in Brittany (Western France) are set over crystalline geology. Water is generally flowing through highly permeable fractures. We show the TDIP potentiality in picturing hydro-geophysical contexts. Those preliminary results need now to be confirmed by both sample measurement and in-situ characterizations. Saint-Brice-en-Cogles (Northern Brittany, N48.422°, W1.377°) The geological context comprises fractured schists with granite inclusions, located on a granite basement. Normal faults from Caledonian to Hercinian era define a horst/graben situation (Fig. 1). A borehole drilled thanks to the CASPAR program produced 43 m 3 h –1 during a preli-minary pumping test, showing the high potentiality for consumable water production. Fig. 1: Block diagram showing the aquifer situation. Fig. 2: Saint-Brice. a) Computed resistivity (Wenner-Schlumberger array, inter-electrode spacing = 3m). b) Computed chargeability (dipole-dipole array, inter-electrode spacing = 3 m).
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Poster communications
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https://hal-insu.archives-ouvertes.fr/insu-01104244
Contributor : Isabelle Dubigeon <>
Submitted on : Friday, January 16, 2015 - 2:01:37 PM
Last modification on : Thursday, September 24, 2020 - 4:00:35 PM
Long-term archiving on: : Friday, September 11, 2015 - 6:57:18 AM

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  • HAL Id : insu-01104244, version 1

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Christian Camerlynck, L Longuevergne, C Roques. TDIP imaging of watershed over crystalline basement. 3rd International Workshop on Induced Polarization, Apr 2014, Oléron, France. 2 p., 3rd International Workshop on Induced Polarization. Abstract book. ⟨insu-01104244⟩

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