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L'HYDROCHIMIE, MARQUEUR DE L'ÉVOLUTION A LONG TERME DES VERSANTS MONTAGNEUX FRACTURÉS VERS DE GRANDS MOUVEMENTS DE TERRAIN
Application à plusieurs échelles sur la haute vallée de la Tinée (Mercantour, France) et sur le versant de Rosone (Gran Paradiso, Italie)

Abstract : In fractured media, the factors that make evolve a stable fractured media towards a landslide highlight the water
effect as an aggravating and a triggering factor of slope instabilities. Long term water effect on stability is
studied from spring water chemistry, which gives data about the weathering state in the slope (aggravating factor
of the instability) and about infiltration event in the massif (triggering factor).
Thus, hydrochemistry enables to propose a conceptual model of flow in unstable slope. A multi scale approach,
in two alpine valleys, of relations between the flows and the instability structures highlights the draining role of
these structures. Slopes comparison enables to discuss the long term evolution of the effect between water
seepages and slope destabilization. Slow movements (toppling, sagging and creep) decompress the upper part of
the slope, increase the infiltrated water volumes and create perched aquifers in the decompressed areas. With the
destabilization, the water / deformation coupling evolves, from high water pressure effect in low storative
fractures to a water high charging effect in the high storative zone, in the upper part of the slope, and can initiate
a rupture.
Hydrogeochemical equilibrium, observed in stable slope, is modified by large landslide crisis. Thus, sulfate
dissolution evolves with active deformation of the slope. This observation enables to demonstrate the possibility
to use hydrochemistry to monitor unstable slopes that can record slow deformation in the slope.
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Submitted on : Tuesday, August 29, 2006 - 6:58:10 PM
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Stéphane Binet. L'HYDROCHIMIE, MARQUEUR DE L'ÉVOLUTION A LONG TERME DES VERSANTS MONTAGNEUX FRACTURÉS VERS DE GRANDS MOUVEMENTS DE TERRAIN
Application à plusieurs échelles sur la haute vallée de la Tinée (Mercantour, France) et sur le versant de Rosone (Gran Paradiso, Italie). Hydrologie. Université de Franche-Comté, 2006. Français. ⟨tel-00090307⟩

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