Les complexes détritiques de marge glaciaire active du Bas Chablais oriental : implications hydrogéologiques .

Authors:
  • GNGérard Nicoud
    Gérard Nicoud
  • ECEmmanuelle Coddet
    Emmanuelle Coddet
  • BBBernard Blavoux
    Bernard Blavoux
  • MDMartial Dray
    Martial Dray
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Abstract
The presence of a wurmian glacier in the Geneva lake basin has blocked the alluvial lateral deposits of the Chablaisian torrents. So, two thick clastic complexes deposited, the first during the englaciation (Evian), the second during the déglaciation (Thonon). The build up of the glacial margin accumulation is detailed for a better understanding of the glacial paleodynamics. Groundwaters in the permeable media show hydrogeochemical and bacteriological characteristics specific to each geological complex , to its origin and therefore, to its hydrodynamic. The Evian complex is particularly identified by the very performing filtration of its sandy-gravelly sedimentologic composition and by a natural protection provided by the upper wurmian morainic cover.