The Generation of Surfzone Eddies in a Strong Alongshore Current

The surfzone contains energetic two-dimensional horizontal eddies with length scale larger than the water depth. Yet, the dominant eddy generation mechanism is not understood. The wave-resolving model funwaveC is used to simulate surfzone eddies in four case examples, from the SandyDuck field experi...

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Veröffentlicht in:Journal of physical oceanography 2014-02, Vol.44 (2), p.600-617
1. Verfasser: FEDDERSEN, Falk
Format: Artikel
Sprache:eng
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Zusammenfassung:The surfzone contains energetic two-dimensional horizontal eddies with length scale larger than the water depth. Yet, the dominant eddy generation mechanism is not understood. The wave-resolving model funwaveC is used to simulate surfzone eddies in four case examples, from the SandyDuck field experiment, that had alongshore uniform bathymetry. The funwaveC model is initialized with the observed bathymetry and the incident wave field in 8-m depth and reproduces the observed cross-shore structure of significant wave height and mean alongshore current. Within the surfzone, the wave-resolving funwaveC-modeled E(f, ky) spectra and the bulk (frequency and ky integrated) rotational velocities are consistent with the observations below the sea–swell band (80%) of vorticity forcing occurring at short alongshore scales
ISSN:0022-3670
1520-0485
DOI:10.1175/jpo-d-13-051.1