Contribution à l'étude de l'impact des anciens travaux miniers de charbon sur les eaux souterraines : application à la région d'Alès (Gard)

Abstract : This thesis is a contribution to the knowledge of the quantitative and qualitative impacts, linked to the abandonment of the mining works on Alès coal basin. This work consisted in analysis and interpretation of quantitative and qualitative data on the waters outflows of former coal mines in order to determine the chemical composition of groundwaters outflows and the water chemistry. For that, we used principal component analysis, diagrams of Piper and Schoeller-Berkalov on all waters outflows. Secondly, we analyzed the temporal evolution of concentrations of each element for the waters outflows. The quantitative aspect is therefore considered by the synthesis of knowledge available on the mining reservoir of Fontanes (geology, spatial distribution, pumping data and piezometrics levels). Some groundwaters outflows have a quality that makes their direct discharge into the environment impossible and it is important, in this situation, to define the affected body of the water. For that, we have developed a hydrodynamical model by sequential automaton. It is applied to the former works of Rochebelle-St-Martin de Valgalgues leading to the determination of the parameters permeability and thickness of mining aquifer recovery of piezometric level of the reservoir while taking into account a pumping still maintained. This model will lead to a better comprehension of the parameters defining the aquifer in the mining perspective to exploit this reserve. The mine water has a poor quality. After a better knowledge obtained by a hydrodynamical modeling, it becomes realistic to propose a recovery of this water by use of its calories from geothermal and knowing the geometry of the tank mine
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Stéphanie Gairoard. Contribution à l'étude de l'impact des anciens travaux miniers de charbon sur les eaux souterraines : application à la région d'Alès (Gard). Autre. Institut National Polytechnique de Lorraine, 2009. Français. ⟨NNT : 2009INPL035N⟩. ⟨tel-01748761⟩

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