EXPERIMENTAL ANALYSIS OF EROSIVE COHESIVE COASTLINE MORPHOLOGY

Proceedings of the International Conference on Coastal Engineering

Bastien Caplain¹  Dominique Astruc¹  Frédéric Moulin¹  Vincent Regard² 

[1] Institut de Mécanique des Fluides de Toulouse;Laboratoire des Mécanismes et Transferts en Géologie

关键词: cliff erosion;    bottom morphology;    experimental modeling;    beach ridge;   

DOI  :  10.9753/icce.v32.sediment.53

学科分类：建筑学

来源: Coastal Engineering Research Council

【 摘 要 】

Laboratory experiments have been performed in a wave flume to investigate the coastal cliff recession under regular waves forcing. The different processes of the cliff erosion cycle are described and we focus on bottom evolution, which seem mostly depend on the surf similarity parameter ξ. We observed steep planar (ξ > 0.7), gentle planar (0.5 < ξ < 0.7) and bared (ξ < 0.5) profiles. We noticed different sandbar dynamics including either steady or unsteady self-sustained oscillating states. Then we estimate the role of the self-organized material on the cliff recession rate. We show that the cliff erosion increases with the wave energy flux and is stronger for a gentle planar profile than for a bared profile of bottom morphology. However, the cliff recession rate as a function of the cliff height is not monotonic due to a different dynamics of bottom morphologies.

【 授权许可】

Unknown