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Processus et Bilans d'altération en milieu tropical (bassin versant de Mule Hole, Inde du Sud) : Sensibilité à la Composition Minéralogique et au Climat

Abstract : The objective of this thesis is to improve our understanding of the chemical weathering processes and of the control factors at a small experimental watershed scale in the Tropics (Mule Hole, South India). Relying on the numerical modelling method, it focuses particularly on the sensitivity to the mineralogy and climate. The first part of this work concerns the mineralogical and chemical descriptions of the soils (chromic luvisol, vertisol) and the bedrock (gneiss). The second part deals with the coupled modelling between a geochemical and a hydrological model. On the first hand, current processes at play in the catchment are investigated. The model is calibrated with both stream and groundwater measured chemical compositions. The results show that the chemical weathering fluxes are mainly supplied by the dissolution of authigenic smectites in soils (5 vol. %) and not by the dissolution of the primary minerals. On the second hand, sensitivity tests to the mineralogical composition and climate are performed.
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https://tel.archives-ouvertes.fr/tel-00531688
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Submitted on : Wednesday, November 3, 2010 - 3:08:02 PM
Last modification on : Thursday, October 15, 2020 - 4:07:01 AM
Long-term archiving on: : Friday, February 4, 2011 - 2:57:21 AM

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Aurélie Violette. Processus et Bilans d'altération en milieu tropical (bassin versant de Mule Hole, Inde du Sud) : Sensibilité à la Composition Minéralogique et au Climat. Planète et Univers [physics]. Université Paul Sabatier - Toulouse III, 2010. Français. ⟨tel-00531688⟩

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