BORE-INDUCED MACROVORTICES OVER A PLANAR BEACH: THE CROSS-SEA CONDITION CASE

Proceedings of the International Conference on Coastal Engineering

Luciano Soldini¹  Matteo Postacchini¹  Maurizio Brocchini¹ 

[1] Università Politecnica delle Marche

关键词: cross sea;    ray theory;    breaking;    vorticity generation;    Nonlinear Shallow Water Equations;   

DOI  :  10.9753/icce.v33.waves.18

学科分类：建筑学

来源: Coastal Engineering Research Council

【 摘 要 】

Wave breaking over submerged topographic obstacles leads to vorticity generation and, at times, to the generation of strong offshore-directed rip currents. The generation of finite-length breakers may also be induced by the positive interaction of wave trains propagating to shore with a relative angle. Such an interaction gives rise to a short-crested system, this, in turn, generating both breakers of finite crossflow length and an intense associated vorticity. We here analyze such a vorticity generation mechanism specifically focusing on the location where wave breaking occurs. To this purpose we use both a simple theoretical approach, based on the well-known theory of wave ray propagation, and ad-hoc numerical simulations, by means of a NSWE (Nonlinear Shallow Water Equations) solver. A fair comparison between such preliminary theoretical and numerical results suggests that the present work can be used as the basis for future analyses of vorticity generation by cross seas.

【 授权许可】

Unknown