3D et géomorphologie karstique : La grotte Chauvet et les cavités des Gorges de l'Ardèche

Abstract : This doctoral thesis aims to explore, develop and exploit the potential of 3D visualization tools and 3D modelling for research on karst morphology and geometry, intrinsically three-dimensional landscape features. This work is based on research in the gorges of the Ardeche region where geomorphological formations and paleogeographic changes are rich and varied, over both geological and human time frames. Since Chauvet Cave's discovery and the establishment of the ERGC (‘Espace de Restitution de la Grotte Chauvet'), this region has presented scientific as well as societal challenges. It is in this context, and in accordance with specificities of the subterranean condition of this karst environment, that 3D visualization and mapping tools were developed and applied at Chauvet Cave and at several other nearby Ardèche canyon caves. The aims of this research were to: (i)Study the speleogenesis and karstogenesis of the cave systems. (ii)Study the geomorphological evolution of a decorated cave (Chauvet Cave). (iii)Advise construction of the facsimile of Chauvet Cave (ERGC project). The first part of this thesis (Chapters 1, 2 and 3) discusses the challenges associated with research on karst geomorphology; the methodology employed to address those challenges; and the contribution of geomorphological knowledge and the usefulness of 3D modelling towards the construction of a facsimile of Chauvet Cave. The second part (Chapters 4, 5 and 6) presents the results of the 3D geomorphological study of the cave systems in the vicinity of the Ardèche canyon. These major results bring new knowledge of karst morphologies and geometric networks that enable a new palaeo-geographic model of landscape evolution since the Neogene to the present. The third and final part of the thesis (Chapters 7, 8 and 9) focuses on research in the prehistoric cave of Chauvet (including its entrance area). This site has been the subject of detailed multidisciplinary investigations (incorporating archaeology, conservation and heritage assessment) on questions relating to the morphology of the palaeo-entrance and the age of the cave's closure through rock collapse.
Keywords : Geomorphology
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Theses
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Benjamin Sadier. 3D et géomorphologie karstique : La grotte Chauvet et les cavités des Gorges de l'Ardèche. Géographie. Université de Grenoble, 2013. Français. ⟨NNT : 2013GRENA030⟩. ⟨tel-01070711⟩

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