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1 March 2016 On Eddy-Mixed Longshore Currents: Video Observation and 3D Modeling off Grand Popo Beach, Benin
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Abstract

Marchesiello, P.; Almar; R.; Benshila; R.; Larnier, S.; Castelle, B., and McWilliams, J.C., 2016. Morphological Change near Artificial Reefs as a Beach Erosion Countermeasure. In: Vila-Concejo, A.; Bruce, E.; Kennedy, D.M., and McCarroll, R.J. (eds.), Proceedings of the 14th International Coastal Symposium (Sydney, Australia). J. Coast. Res., Special Issue, No. 75, pp. 408–412. Coconut Creek (Florida), ISSN 0749-0208.

The link between intrinsic shear-flow instability of longshore currents and their mean cross-shore profiles has long been suggested. Yet, recent investigations give increasing credit to extrinsic wave forcing mechanisms, downplaying the role of shear waves on the observed variability. Our results for Grand Popo beach, Benin, provide an original attempt to map mean longshore currents forced by an oblique swell. A 3D model investigation shows that their broad mean flow and the frequency band of eddy variability are consistent with shear instability, conversion of mean to eddy kinetic energy and eddy mixing of momentum. Their turbulent dynamics do not clearly fit in any classical 2D or 3D paradigms but show large transfer of energy across the wavenumber spectrum, to both larger and smaller scales.

Marchesiello, Almar, Benshila, Larnier, Castelle, and McWilliams: On Eddy-Mixed Longshore Currents: Video Observation and 3D Modeling off Grand Popo Beach, Benin
©Coastal Education and Research Foundation, Inc. 2016
Patrick Marchesiello, Rafael Almar, Rachid Benshila, Stanislas Larnier, Bruno Castelle, and James C. McWilliams "On Eddy-Mixed Longshore Currents: Video Observation and 3D Modeling off Grand Popo Beach, Benin," Journal of Coastal Research 75(sp1), 408-412, (1 March 2016). https://doi.org/10.2112/SI75-082.1
Received: 15 October 2015; Accepted: 15 January 2016; Published: 1 March 2016
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