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<datestamp>2018-01-11</datestamp>
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<title lang=en>Innovative Field Methods for Characterizing the Hydraulic Properties of a Complex Fractured Rock Aquifer (Ploemeur, Brittany)</title>
<creator>Bour, Olivier</creator>
<creator>Le Borgne, Tanguy</creator>
<creator>Longuevergne, Laurent</creator>
<creator>Lavenant, Nicolas</creator>
<creator>Jimenez-Martinez, Joaquin</creator>
<creator>De Dreuzy, Jean-Raynald</creator>
<creator>Schuite, Jonathan</creator>
<creator>Boudin, Frederick</creator>
<creator>Aquilina, Luc</creator>
<contributor>Géosciences Rennes (GR) ; Université de Rennes 1 (UR1) - Institut national des sciences de l'Univers (INSU - CNRS) - Observatoire des Sciences de l'Univers de Rennes (OSUR) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<description>International audience</description>
<source>AGU Fall Meeting 2014</source>
<coverage>San Francisco, United States</coverage>
<contributor>American Geophysical Union</contributor>
<identifier>insu-01088596</identifier>
<identifier>https://hal-insu.archives-ouvertes.fr/insu-01088596</identifier>
<source>https://hal-insu.archives-ouvertes.fr/insu-01088596</source>
<source>AGU Fall Meeting 2014, Dec 2014, San Francisco, United States. pp.H51P-01, 2014</source>
<language>en</language>
<subject>[SDU.STU] Sciences of the Universe [physics]/Earth Sciences</subject>
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<type>Conference papers</type>
<description lang=en>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.</description>
<date>2014-12-15</date>
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