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).
https://hal-insu.archives-ouvertes.fr/insu-01104244
Contributor : Isabelle Dubigeon Connect in order to contact the contributor
Submitted on : Friday, January 16, 2015 - 2:01:37 PM
Last modification on : Wednesday, May 11, 2022 - 4:09:17 AM
Long-term archiving on: : Friday, September 11, 2015 - 6:57:18 AM
Contributor : Isabelle Dubigeon Connect in order to contact the contributor
Submitted on : Friday, January 16, 2015 - 2:01:37 PM
Last modification on : Wednesday, May 11, 2022 - 4:09:17 AM
Long-term archiving on: : Friday, September 11, 2015 - 6:57:18 AM
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