Ressources en eau souterraine dans les chaînons béarnais (Pyrénées-Atlantiques, France). Géométrie et fonctionnement hydrogéologique de quatre aquifères carbonatés.

Abstract : This work concerns the hydrogeological study of four springs located in the “chaînons béarnais” (Western Pyrenees). In order to improve the knowledge of the geometry and the functioning of these aquifers, a multidisciplinary approach was chosen. Geophysical experiments, hydrogeochemical survey of groundwater coupled with field work, were thus carried out. First of all, the statistical study of the regional climatic parameters showed a significant rise in the temperature since fifty years and which is accentuated since the 70's. From the results of electric resistivity surveys coupled with the measures of the fracturing of the carbonated massifs, the geometry of the geological contacts and the structure of the aquifers were determined. Furthermore, it was possible to identify the systematic presence of a continuous clayey level along the southern limit of the local aquifers. The spring's water catchment areas are so limited by this low permeability shield to the south and by marls to the north. The analysis of the evolution of the physico-chemical parameters brought to light two different ways of functioning among the four studied systems. Two springs emerge from karstic aquifers whereas two others are issued from fissured aquifers. The differences in major ions and stable isotopes (13C) variations illustrate the short residence time within the karstic systems and the inertial behaviour of the fissured carbonated aquifers. Moreover, the analysis of the electrical conductivity/turbidity relationships provided information on the internal organization of the two karstic systems and their hydrodynamic functioning. In conclusion this work brings a new point of view on the management of water in this area and allowed to propose a model of study which helps to characterize the regional groundwater resources.
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Submitted on : Tuesday, February 26, 2008 - 11:01:38 AM
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Fabrice Rey. Ressources en eau souterraine dans les chaînons béarnais (Pyrénées-Atlantiques, France). Géométrie et fonctionnement hydrogéologique de quatre aquifères carbonatés.. Hydrologie. Université Sciences et Technologies - Bordeaux I, 2007. Français. ⟨tel-00258960⟩

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