| Titre : | Measurements of surf zone sand bed dynamics under irregular waves (2012) |
| Auteurs : | Céline Berni, Auteur ; Hervé Michallet, Auteur ; Eric Barthélemy, Auteur |
| Type de document : | Article : texte imprimé |
| Dans : | European journal of environmental and civil engineering (Vol. 16 N° 8 (N° Spécial), Septembre 2012) |
| Article en page(s) : | pp. 981-994 |
| Note générale : | Génie Civil |
| Langues : | Anglais |
| Tags : | Sediment transport Erosion Sheet flow Wave breaking Pore pressure |
| Résumé : | Measurements of velocity profiles, sediment concentration, pore-pressure and sheet flow layer dynamics are analysed in order to better assess the relative importance of the processes that contribute to destabilise the bed of a sandy beach. These measurements were conducted in the surf zone of irregular waves, in a 30 m × 30 m wave tank. The effects of flow acceleration, excess pore-pressure vertical gradients across the bed and infiltration/exfiltration seepage flow are studied. The appearance of a sheet flow layer is apparently initiated by the strong accelerations in the wave fronts. These results are compared to field measurements at Truc-Vert beach (Atlantic coast of France). Probably due to the partial saturation of the bed made of finer sand in the wave tank experiments, the upwards-directed excess pore-pressure gradient could enhance the bed destabilisation compared to that observed in the field. |
| ISSN : | 1964-8189 |
| En ligne : | http://www.tandfonline.com/doi/full/10.1080/19648189.2012.705957 |
