Personne :
Jaboyedoff, M.

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Structures organisationnelles
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Jaboyedoff
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M.
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Département de géologie et de génie géologique, Faculté des sciences et de génie, Université Laval
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ncf11710243
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  • Publication
    Restreint
    Discrete fracture network modelling using Coltop3D for rockfall potential assessment at Glacier Point, Yosemite Valley
    (2014-10-01) Jaboyedoff, M.; Matasci, Battista; Grenon, Martin; Stock, Greg M.
    We performed regional and site-specific structural studies of the cliff below Glacier Point in Yosemite Valley using Coltop 3D software analyses of previous Aerial Laser Scanning (ALS) and new local Terrestrial Laser Scanning (TLS) data. Coltop3D computes the spatial orientation (dip direction and dip) of each point within a point cloud with respect to its neighboring points. Coltop3D attributes a unique RGB color to each spatial orientation, allowing accurate identification of the major discontinuity sets. It is thus possible to quickly obtain a great number of measurements for joint orientations responsible for shaping a rock cliff. We performed manual measurements of fracture spacing and trace length on the point clouds using Polyworks (Innovmetric). The 3D view of the TLS dataset was compared to high-resolution photographs to accurately follow the discontinuity traces. We used these input parameters to generate a discrete fracture network (DFN) model of the fractured rock mass at Glacier point cliff. The model was calibrated to match field observations. Several possible DFN models of the site were generated. These DFN were then used to assess rockfall potential on specific sections of the Glacier Point cliff.