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The slope movements within the Mondorès graben (Drôme, France); the interaction between geology, hydrology and typology
Authors:T A Bogaard  P Antoine  P Desvarreux  A Giraud  Th W J van Asch
Institution:

a Department of Physical Geography, University Utrecht, PO Box 80115, 3508 TC Utrecht, The Netherlands

b Institut de Recherches Interdisciplinaires de Géologie et de Mécanique, Université Joseph Fourier, BP 53, 38041 Grenoble Cedex 9, France

Abstract:The Mondorès graben in the south-eastern French Alps is an uncommon structural feature, which originates in a complex polyphasic tectonic evolution. In contrast with its immediate surroundings, with hardly any huge landslides, the Mondorès graben is characterised by various types of landslides. A huge sagging caused part of the limestone cliff to subside some 50 m within 50 years. Two recent mud flows that occurred were considered a potential threat to some inhabited places downstream. The hydrologic aspects of the Boulc-Mondorès landslide resemble the geology: infiltration (and karst input?) in the rock-sliding zone and exfiltration in the marls resulting in slumps and mud flows. The mass movement interactions could be explained by a structural geology analysis with geodetic monitoring using different techniques. It is also shown that hydrochemistry as well as geophysical surveys are of importance in unravelling the hydrologic systems and the geological subsurface structures. The present paper aims at explaining the geological control of the different slides in view of estimating their potential danger. Understanding the geological structure and its evolution therefore is a necessary prerequisite.
Keywords:France  Geodesy  Geology  Hydrology  Landslides
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