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A multidisciplinary approach to determine the structural geometry of hard-rock aquifers. Application to the Plancoet migmatitic aquifer (NE Brittany, W France)

2006; EDP Sciences; Volume: 177; Issue: 5 Linguagem: Inglês

10.2113/gssgfbull.177.5.227

1777-5817

Véronique Durand, Benoı̂t Deffontaines, Véronique Léonardi, R. Guérin, Robert Wyns, Ghislain de Marsily, Jean-Luc Bonjour,

Groundwater and Watershed Analysis

Abstract A new multidisciplinary methodology is developed to determine the structural geometry of hard-rock aquifers. The Plancoët migmatitic basement, chosen as an example for the use of this methodology, is studied both at a regional (300 km2) and a local (4 km2) scale. The regional mapping, based on field mapping of the tectonic structures and the weathered layers, on geostatistics and on aerial photographs and Digital Elevation Model (DEM) analyses, demonstrates the influence of the tectonic structures on the weathering processes. Some geo-electric investigations, added to the first mapping at the local scale, lead to the building of a local geometrical model of the aquifer.