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Evolution of the ripple field under a wave regime on the offshore of the breaker bar, along the beach profile: Experiment using CT-Scan imaging.

Long, Bernard; Takayama, Hayato; Mukunoki, Toshifumi; Montreuil, Stéphane; Brunelle, Corinne; Desroches, Mathieu; Daigle, Louis-Frédéric (2015). Evolution of the ripple field under a wave regime on the offshore of the breaker bar, along the beach profile: Experiment using CT-Scan imaging. In: 2nd International Conference on Tomography of Materials and Structures - ICTMS 2015, 29 juin-3 juillet 2015, Québec, Canada.

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Résumé

Beach profile stability is a key factor of the coastal erosion. To understand if a beach profile is stable it is essential to analyze this profile in a physical model. A beach model under waves regime was generated in a small scale model to investigate the formation and the evolution of a ripple field over a sloping (1:15) sand beach with a 0.215 mm sand (Ottawa sand). The aim of this research is to improve the knowledge of the beach profile dynamics and the contribution of the ripple field to the nearshore bar development. This experiment simulates the formation and evolution of ripples from a flat beach profile, with wave of 1.5 second period and 4 cm height. The flume was instrumented with a Siemens CT-Scan in both spiral and perfusion modes and the particle image velocimetry (PIV). These two instruments were covering the offshore of the breaker bar by a series of measurement each 20 minutes during a 5 hours period. The aims of these studies are to determine the evolution of the suspended sediment concentration by both CT-Scan and PIV, the evolution of the current distribution by PIV and finally the variation of the water concentration under the sand column during wave passage. These evolutions are monitored during the beach profile evolution from a flat bed to a nearshore bar bed. Then, the X-ray tomography method coupled with a PIV method showed promising results to measure the simultaneous evolution of the suspended load zone, the bedload zone and the transition zone.

Type de document: Document issu d'une conférence ou d'un atelier
Mots-clés libres: vague; ondulation; imagerie CT-Scan
Centre: Centre Eau Terre Environnement
Date de dépôt: 18 nov. 2020 21:17
Dernière modification: 25 nov. 2020 18:54
URI: http://espace.inrs.ca/id/eprint/4320

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