Theoretical and Computational Fluid Dynamics

, Volume 10, Issue 1, pp 295–309

Surf Zone Currents

Authors

  • D.H. Peregrine
    • School of Mathematics, Bristol University, University Walk, Bristol, BS8 1TW, England

DOI: 10.1007/s001620050065

Cite this article as:
Peregrine, D. Theoret. Comput. Fluid Dynamics (1998) 10: 295. doi:10.1007/s001620050065

Abstract:

A large fraction of the water-wave energy incident on beaches is dissipated as the waves break and travel towards the shore through the surf zone. However, the momentum associated with the incident waves is not destroyed and drives other motions within the surf zone. An analysis is given of the unsteady and irregular currents that may occur in the surf zone. The forcing due to a discrete group of waves, and the vorticity of the surf-zone currents are the major topics. In particular, the almost two-dimensional nature of the flow implies that significant eddies are likely to be generated. There is evidence that eddies arise from long-shore currents, and the combination of eddies of opposite sign gives rip currents. It is noted that generation of vorticity by non-uniformities in bores may be a useful way of considering the forcing of surf zone motion. Expressions for the rate of increase in the circulation about material circuits and the vorticity generated at bores are derived.

Copyright information

© Springer-Verlag Berlin Heidelberg 1998