Laboratory air-entraining breaking waves: imaging visible foam signatures to estimate energy dissipation
File(s)
Published version
Author(s)
Callaghan, AH
Deane, GB
Stokes, MD
Type
Journal Article
Abstract
Oceanic air‐entraining breaking waves fundamentally influence weather and climate through bubble‐mediated ocean‐atmosphere exchanges, and influence marine engineering design by impacting statistics of wave heights, crest heights, and wave loading. However, estimating individual breaking wave energy dissipation in the field remains a fundamental problem. Using laboratory experiments, we introduce a new method to estimate energy dissipation by individual breaking waves using above‐water images of evolving foam. The data show the volume of the breaking wave two‐phase flow integrated in time during active breaking scales linearly with wave energy dissipated. To determine the volume time‐integral, above‐water images of surface foam provide the breaking wave timescale and horizontal extent of the submerged bubble plume, and the foam decay time provides an estimate of the bubble plume penetration depth. We anticipate that this novel remote sensing method will improve predictions of air‐sea exchanges, validate models of wave energy dissipation, and inform ocean engineering design.
Date Issued
2016-11-16
Date Acceptance
2016-10-24
Citation
Geophysical Research Letters, 2016, 43 (21), pp.11320-11328
ISSN
0094-8276
Publisher
Wiley
Start Page
11320
End Page
11328
Journal / Book Title
Geophysical Research Letters
Volume
43
Issue
21
Copyright Statement
©2016. American Geophysical Union. All Rights Reserved.
Identifier
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000389305000032&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
Subjects
Science & Technology
Physical Sciences
Geosciences, Multidisciplinary
Geology
WHITECAPS
DEPENDENCE
Publication Status
Published
Date Publish Online
2016-10-26