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Wave-sediment interaction imaging with X-ray tomography: A small-scale experiment to characterize the artefacts.

Brunelle, Corinne; Long, Bernard; Francus, Pierre; Daigle, Louis-Frédéric; Desroches, Mathieu; Takayama, Hayato (2015). Wave-sediment interaction imaging with X-ray tomography: A small-scale experiment to characterize the artefacts. In: 2nd International Conference on Tomography of Materials and Structures - ICTMS 2015, 29 juin-3 juillet 2015, Québec, Canada.

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Résumé

Complexity of currents dynamics with porous sand beds has no analytical solutions. Hence, empirical relations are needed to validate fluid-sediment interaction models. To achieve this, travelling waves were generated in a small-scale physical model (1:17) to investigate the wave-sediment processes over a sloping beach at the Multidisciplinary Laboratory of CT-Scan for Non-Medical Use (INRS). A hydraulic flume, filled with sediments and water, was inserted into the medical CT-scanner. The experiment simulates storm waves, with the equivalent real-scaled periods and heights, approaching the beach in shallow waters. The aim of this research is to improve the monitoring system of sediments dynamics in coastal regions. This experimental setup provided a complete overview of the density variations (i.e., water infiltration) into thte beach which is impossible to cover in a real-scale experiment. The two main sources of artefacts of the reconstructed X-ray images are: 1) the tube power limitation and 2) the geometry of the beach. These limitations are caused by the high density of material, inducing noise, and the square form of the beach (axial plane) creating black streaks during the image reconstruction. The X-ray tomography method showed anyhow promising results to measure key parameters such as the sediment transport and the grain size sorting as well as 4D measurements. Algorithms for image interpretation (i.e., error delimitation, edge tracking, statistical analysis, etc.) are presented.

Type de document: Document issu d'une conférence ou d'un atelier
Mots-clés libres: tomographie; rayon X; artefacts; imagerie d'interaction onde-sédiment
Centre: Centre Eau Terre Environnement
Date de dépôt: 18 nov. 2020 20:47
Dernière modification: 25 nov. 2020 15:33
URI: http://espace.inrs.ca/id/eprint/4299

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