3D, laserscanning and geomorphological studies in Orgnac cave (Ardèche, France)

Abstract : Recent laserscanning techniques can revisit the geomorphological analysis methods traditionally used in caves. Indeed, laser scanning offers very high resolution topography. Very large point clouds are acquired and after consolidation, meshing and processing, analyzes on the 3D models can be performed. This type of approach is particularly interesting in cavities where size or conservation issues are important. This is the case of Orgnac, a major French tourist cavity, the only cave ranked "Grand Site de France". Three examples of 3D geomorphology studies illustrate here the relevance of this approach. (1) The gigantic underground volumes did not allow direct observation of all parietal morphologies. A 3D reconstruction of the "Salles rouges" chamber permits the identification of bench-marks on the 3D model. These works give us a reconstitution of the sedimentary aggradations during Pliocene. (2) A forest of stalagmites tilted was protected for conservation reasons and access restrictions. Again, the construction of a 3D model and some informatics developments give us automatic mapping to study, in their environment, the geometrical characteristics of 140 stalagmites. Finally (3), a detrital fan is currently being excavated for archaeological studies. This excavation destroys irreparably a side of this unique underground archive. Site supervision by lidar offers at each stage of the search, a topography which is a very fine memory of the deposit. In addition, 3D reconstruction and analysis of sedimentary structures provides information about its genesis. Through the diversity of these three examples, we measure the value of this type of analysis on 3D model to better understand underground morphologies. The implementation of this approach in tourist cave also offers an additional opportunity: the scientific mediation to the public, eager for this type of 3D production with many possibilities of representation.
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Submitted on : Tuesday, October 1, 2013 - 10:46:16 AM
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  • HAL Id : halsde-00868197, version 1


Stéphane Jaillet, Elisa Boche, Benjamin Sadier, Estelle Ployon, Françoise Prud'Homme, et al.. 3D, laserscanning and geomorphological studies in Orgnac cave (Ardèche, France). International congress on "scientific research in show caves", Sep 2012, Postojna, Slovenia. ⟨halsde-00868197⟩



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