Abstract
The results from a series of wind-wave flume experiments using simultaneous DPIV (digital particle image velocimetry) measurements and IR (infrared) imagery to investigate microscale breaking waves are presented. We show that the IR signatures of microscale breaking waves are produced by a series of strong vortices that form behind the leading edge of the breakers. These strong vortices disrupt the cool skin layer and generated a thin layer of enhanced turbulence immediately below the air-water interface. In addition we used CFT (controlled flux technique) to make measurements of the local heat transfer velocity and found that the transfer velocity was correlated with the near-surface vertical turbulent velocity. We conclude that near-surface turbulence generated by microscale wave breaking determines the transfer rate at low to moderate wind speeds.
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