Measurements of surf zone sand bed dynamics under irregular waves / Céline Berni in European journal of environmental and civil engineering, Vol. 16 N° 8 (N° Spécial) (Septembre 2012)  

Public ISBD [article]  inEuropean journal of environmental and civil engineering > Vol. 16 N° 8 (N° Spécial) (Septembre 2012) . - pp. 981-994 Titre : Measurements of surf zone sand bed dynamics under irregular waves Type de document : texte imprimé Auteurs : Céline Berni, Auteur ; Hervé Michallet, Auteur ; Eric Barthélemy, Auteur Année de publication : 2012 Article en page(s) : pp. 981-994 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : 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 [article] Measurements of surf zone sand bed dynamics under irregular waves [texte imprimé] / Céline Berni, Auteur ; Hervé Michallet, Auteur ; Eric Barthélemy, Auteur . - 2012 . - pp. 981-994. Génie Civil Langues : Anglais (eng) in European journal of environmental and civil engineering > Vol. 16 N° 8 (N° Spécial) (Septembre 2012) . - pp. 981-994 Mots-clés : 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

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