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Communication dans un congrès
Ripple filtering and ridge enhancement applied to morphodynamical tracking of sand dunes
Abstract : A 3D global semi-automatic approach based on bathymetric triangulated irregular network (TIN) is developed to extract the overall sand dunes pattern inside a given area. This method takes advantage of a new purpose-built anisotropic filter able to enhance the dominant features of the bathymetric mesh surfaces while smoothing out their ripples. The salient ridge and valley lines of the sand dunes are automatically extracted as 3D parametric curves trough a saliency indicator. This new approach is tested on a fourteen years long time series of thirty MBES bathymetric datasets acquired by the Continental Shelf Service of the FPS Economy of Belgium on a monitoring area located on the northern part of the Middelkerke bank (Flemish banks, Belgian part of the North Sea). Based on the 3D vectors resulting from this approach, 3D augmented representation can right now assist geoscientists in tracking dunes morphology and dynamic but calculation methods should be specifically developed to assess the magnitude and direction of the dunes movement and evaluate the volume of sand involved in the dune dynamics.
Littérature citée [6 références]
https://hal-ensta-bretagne.archives-ouvertes.fr/hal-01312568
Contributeur : Nathalie Debese <>
Soumis le : vendredi 24 juin 2016 - 15:44:50
Dernière modification le : mercredi 24 juin 2020 - 16:19:51
Archivage à long terme le : : dimanche 25 septembre 2016 - 12:48:33
Contributeur : Nathalie Debese <>
Soumis le : vendredi 24 juin 2016 - 15:44:50
Dernière modification le : mercredi 24 juin 2020 - 16:19:51
Archivage à long terme le : : dimanche 25 septembre 2016 - 12:48:33
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Manuscript Debese_MaridV pp.57...
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