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Extraction of sandy bedforms features through geodesic morphometry

Nathalie Debese 1, 2 Jean-José Jacq 3 Thierry Garlan 4
1 Lab-STICC_ENSTAB_CID_TOMS
Lab-STICC - Laboratoire des sciences et techniques de l'information, de la communication et de la connaissance (UMR 3192), STIC - Pôle STIC [Brest]
2 Pôle STIC_OSM
ENSTA Bretagne - École Nationale Supérieure de Techniques Avancées Bretagne
Abstract : State-of-art echosounders reveal fine-scale details of mobile sandy bedforms, which are commonly found on continental shelfs. At present, their dynamics are still far from being completely understood. These bedforms are a serious threat to navigation security, anthropic structures and activities, placing emphasis on research breakthroughs. Bedform geometries and their dynamics are closely linked; therefore, one approach is to develop semi-automatic tools aiming at extracting their structural features from bathymetric datasets. Current approaches mimic manual processes or rely on morphological simplification of bedforms. The 1D and 2D ap- proaches cannot address the wide ranges of both types and complexities of bedforms. In contrast, this work attempts to follow a 3D global semi-automatic approach based on a bathymetric TIN. The currently extracted primitives are the salient ridge and valley lines of the sand structures, i.e., waves and mega-ripples. The main difficulty is eliminating the ripples that are found to heavily overprint any observations. To this end, an anisotropic filter that is able to discard these structures while still enhancing the wave ridges is proposed. The second part of the work addresses the semi-automatic interactive extraction and 3D augmented display of the main lines structures. The proposed protocol also allows geoscientists to interactively insert topological constraints.
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https://hal-ensta-bretagne.archives-ouvertes.fr/hal-01330663
Contributeur : Nathalie Debese <>
Soumis le : samedi 24 novembre 2018 - 12:50:38
Dernière modification le : jeudi 19 décembre 2019 - 01:36:08
Document(s) archivé(s) le : lundi 25 février 2019 - 12:54:31

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GeoMorphology_Debese16.pdf
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  • HAL Id : hal-01330663, version 1

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Nathalie Debese, Jean-José Jacq, Thierry Garlan. Extraction of sandy bedforms features through geodesic morphometry. Geomorphology, Elsevier, 2016, 268, pp.82-97. ⟨hal-01330663⟩

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