Abstract
Wind-induced water waves observed in natural lakes and ocean cause secondary currents called as Langmuir circulation. Since these large-scale longitudinal circulations promote significant transfers of mass and momentum, high and low speed streaks appear on the free-surface accompanied with strong upward and downward flows. So, in order to deal with environmental topics under the water waves, it is necessary to reveal generation mechanisum of Langmuir circulation. In the presnt study, all three velocity components could be measured simultaneously by the stereo scopic PIV technique. Furthermore, space and time variations of air/watter interface were evaluated accurately by the high-speed camera synchroneized to the velocity measurements. The present multi-camera system allowd us to investigte the phase relation between the surface fluctuation and the velocity components, effects of aspect ratio on formation properties of Langmuir circulation and so on.
