Laboratory observations of spray generation over fresh and salt water in very high winds (Invited Presentation)

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Tuesday, 6 January 2015: 11:00 AM
224A (Phoenix Convention Center - West and North Buildings)
Brian Haus, Univ. of Miami/RSMAS, Miami, FL

To determine the effect that sea spray has on the bulk momentum transfer coefficient between the air and water in very high winds a series of comprehensive laboratory experiments were conducted in the Air-Sea Interaction Saltwater Facility (ASIST) at the University of Miami. The spray concentrations due to wind-wave interactions were measured in both fresh and saltwater in very high winds for sizes ranging from 5x10-3 µm to ~600 µm. The results show different size distributions in salt and fresh –water as expected. There was a distinct shift to larger spray droplets in salt water, this is in contrast to the much smaller bubble size distributions and larger overall concentrations of bubbles. Imaging of the air-sea interface during spray generation has revealed the intermittent presences of Kelvin-Helmholtz like instabilities, which may provide a mechanism for the enhanced spume generation.