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Analyse spatiale de la composition chimique des ruisseaux vosgiens

Abstract : The aim of this study was to analyse the spatial variability of stream water composition at lowflow in the Vosges Mountains. We showed that the mineral element concentration can be explained by three main factors: annual rainfall, bedrock composition and the area of the catchment. The principal influence of the precipitations suggests that the stream water concentrations are acquired in the soil. Stream water concentrations in base cations are strongly related to the bedrock content in weatherable minerals, when these minerals are still available in substantial amounts in the soil horizons and saprolite. Potassium concentrations are mainly related to the K-feldspar weathering and the trapping of the K, released by K-feldspar weathering, by clays. On sandstone, Na originates mainly from the atmosphere, and Si results from dilution of the soil solutions by the rainfall. On granite, in addition to this dilution, Na concentrations are controlled by ion exchange with the other cations released in the drainage waters by the weathering.
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Théodora Nedeltcheva. Analyse spatiale de la composition chimique des ruisseaux vosgiens. Sciences de la Terre. Université Henri Poincaré - Nancy 1, 2005. Français. ⟨NNT : 2005NAN10189⟩. ⟨tel-01748076⟩

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