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Morphologie et dynamique des laves torrentielles : Applications aux torrents des Terres Noires du bassin de Barcelonnette (Alpes du Sud)

Alexandre Remaître 1
1 LETG - Caen - Littoral, Environnement, Télédétection, Géomatique
LETG - Littoral, Environnement, Télédétection, Géomatique UMR 6554
Abstract : Debris flows constitute a major natural risk in mountainous areas. Debris flows consist of a highly concentrated mixture of soil, rock, wood debris and water which flows rapidly downvalley in a series of surges with steep fronts that consist mostly of large boulders. The considerable energy involved and the great size of torrential watersheds often render inefficient any techniques of protection. Generally, the studies trying to estimate these volume of debris flow concern either the detrital production of slopes, or the sediment supply only in exit, but rarely the erosion/deposition process along the pathway and the neighbouring slopes. A scientific work has been carried out to deal with this problem on the basis of a better knowledge of debris flow processes. This approach is based on spatial analysis (in-situ observations and measurements, GIS), geomechanical and rheological tests and finally numerical modelling. The Faucon torrent, where two important debris flows occurred during the last ten years, has been chosen as experimental study site. Due do the complexity of the phenomena, the use of only one code is not possible. Therefore, a specific numerical approach has been carried out for each stage of this phenomenon (triggering, runout and spreading). This thesis thus contributes to improved scientific knowledge of the torrent processes, and brings further informations for the development of future models.
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https://tel.archives-ouvertes.fr/tel-00119737
Contributor : Alexandre Remaître <>
Submitted on : Friday, February 16, 2007 - 9:51:38 AM
Last modification on : Wednesday, October 14, 2020 - 4:09:28 AM
Long-term archiving on: : Friday, November 25, 2016 - 2:25:22 PM

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  • HAL Id : tel-00119737, version 2

Citation

Alexandre Remaître. Morphologie et dynamique des laves torrentielles : Applications aux torrents des Terres Noires du bassin de Barcelonnette (Alpes du Sud). Géomorphologie. Université de Caen, 2006. Français. ⟨tel-00119737v2⟩

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