Structure and hydrogeochemical functioning of a sparkling natural mineral water system from a multidisciplinary approach: a case study from southern FranceReportar como inadecuado




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1 BRGM - Bureau de Recherches Géologiques et Minières 2 Evian Volvic World Sources

Abstract : Natural mineral waters NMW, often used to produce bottled water, are of high socio-economic interest and need appropriate management to ensure the sustainability of the resource. A complex sparkling NMW system at La Salvetat, southern France, was investigated using a multidisciplinary approach. Geological and geophysical investigations, pumping test analyses, time-series signal processing, hydrogeochemical and isotopic data both stable and radiogenic, and numerical modelling provided complementary information on the geometry, hydrodynamic characteristics and functioning of this mineral system. The conceptual model consists of a compartmentalized reservoir characterized by two subvertical, parallel deeply-rooted hydraulically independent permeable structures that are fed by deep CO2-rich crustal fluids. The non-mineralized shallow aquifer system corresponds to a fissured layer within the weathered zone that is recharged by leakage from the overlying saprolite. This surficial aquifer responds rapidly to recharge 40 - 80 days, whereas the deep system-s response to recharge is much longer up to 120 days. This research demonstrates the need for multidisciplinary approaches and modelling quantity, hydrochemistry for understanding complex NMW systems. This knowledge is already being applied by the bottling company that manages the resource at La Salvetat, and would be useful for conceptualizing other NMW sites.

Keywords : thermal conditions CO2 fractured rock natural mineral water France





Autor: Jean-Christophe Maréchal - Patrick Lachassagne - Bernard Ladouche - Benoit Dewandel - Sandra Lanini - Paul Le Strat - Emmanuelle

Fuente: https://hal.archives-ouvertes.fr/



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