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Laboratory studies of Lagrangian transport by breaking surface waves

Published online by Cambridge University Press:  01 August 2019

Luc Lenain Open the ORCID record for Luc Lenain [Opens in a new window] ,
Nick Pizzo Open the ORCID record for Nick Pizzo [Opens in a new window]  and
W. Kendall Melville
Luc Lenain*
Affiliation:
Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA 92037, USA
Nick Pizzo
Affiliation:
Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA 92037, USA
W. Kendall Melville
Affiliation:
Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA 92037, USA
*
†Email address for correspondence: llenain@ucsd.edu
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Abstract

While it has long been recognized that Lagrangian drift at the ocean surface plays a critical role in the kinematics and dynamics of upper ocean processes, only recently has the contribution of wave breaking to this drift begun to be investigated through direct numerical simulations (Deike et al., J. Fluid Mech., vol. 829, 2017, pp. 364–391; Pizzo et al., J. Phys. Oceanogr., vol. 49(4), 2019, pp. 983–992). In this work, laboratory measurements of the surface Lagrangian transport due to focusing deep-water non-breaking and breaking waves are presented. It is found that wave breaking greatly enhances mass transport, compared to non-breaking focusing wave packets. These results are in agreement with the direct numerical simulations of Deike et al. (J. Fluid Mech., vol. 829, 2017, pp. 364–391), and the increased transport due to breaking agrees with their scaling argument. In particular, the transport at the surface scales with $S$, the linear prediction of the maximum slope at focusing, while the surface transport due to non-breaking waves scales with $S^{2}$, in agreement with the classical Stokes prediction.

JFM classification

Geophysical and Geological Flows: Air/sea interactions Waves/Free-surface Flows: Surface gravity waves Waves/Free-surface Flows: Wave breaking
Type
JFM Rapids
Information
Journal of Fluid Mechanics , Volume 876 , 10 October 2019 , R1
Copyright
© 2019 Cambridge University Press 

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