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Analyse haute résolution de la morphologie des paysages et des processus à partir de LiDAR aéroporté répété et simulation hydraulique

Abstract : The fundamental objective of geomorphology is the identification and characterisation of the processes shaping landscapes. By providing a high accuracy, high density 3D representation of landscapes, airborne LiDAR has revolutionised our ability to extract information from the topography providing new opportunities for the identification and understanding of geomorphological processes. This potential remains underutilized in many geomorphological problems due to the inability of current analysis methods to exploit the amount and detail of information provided by airborne LiDAR. This thesis integrates the latest developments in 2D hydraulic simulation and 3D change detection to improve analysis methods for (i) the description of fluvial landform structures and (ii) the identification and geometric analysis of landslides at high resolution. The main results show that 2D hydraulic simulation allows the definition of hydro-geomorphic indicators that fully account for the high resolution structure of flow patterns. These indicators allow for a better identification of hillslope-channel connexions and the characterisation of the hydraulic geometry of channels. The integration of 3D change detection allows the exploitation of the 3D structure of LiDAR data for the creation of robust, complete and objective landslide inventories. This approach allows a better quantification of landslide volume than traditional approaches.
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https://tel.archives-ouvertes.fr/tel-03783246
Contributor : ABES STAR :  Contact
Submitted on : Thursday, September 22, 2022 - 9:30:06 AM
Last modification on : Friday, September 23, 2022 - 5:21:02 AM

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  • HAL Id : tel-03783246, version 1

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Thomas Bernard. Analyse haute résolution de la morphologie des paysages et des processus à partir de LiDAR aéroporté répété et simulation hydraulique. Sciences de la Terre. Université Rennes 1, 2022. Français. ⟨NNT : 2022REN1B011⟩. ⟨tel-03783246⟩

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