ON THE INITIATION OF NEARSHORE MORPHOLOGICAL RHYTHMICITY

Proceedings of the International Conference on Coastal Engineering

Roshanka Ranasinghe²  Ad Reniers³  Matthieu Andreas de Schipper¹  Marcel Stive¹ 

[1] Delft University of Technology;Unesco IHE, Delft University of Technology;Rosenstiel School of Marine and Atmosperic Science, University of Miami

关键词: Rhythmicity;    Nearshore sandbars;    Wave groups;   

DOI  :  10.9753/icce.v32.sediment.47

学科分类：建筑学

来源: Coastal Engineering Research Council

【 摘 要 】

Nearshore rhythmicity is often initiated in the period just after a storm where the subtidal bar is turned alongshore uniform. The initiation time as well as the length scales of the created rhythmicity varies from one storm period to another.Here we show that the post-storm wave conditions are related to the initiation of the morphological rhythmicity. Narrow-banded and long wave period, both proxies for swell waves, are often found to be present priorto the initiation of rhythmicity. Furthermore, numerical model computations illustrate that swell waves induce significantly larger wave group induced velocities on the bar.These findings imply that the arrival of swell waves can initiate and stimulate the nearshore morphological rhythmicity.

【 授权许可】

Unknown