Abstract
This paper describes an experimental study on mutual turbulence interactions across air-water interface in wind-induced water waves by using two sets of laser Doppler anemometers (LDA) at the air-water layers sim ultaneously. The purpose of this study is to clarify turbulence structures at a wind-driven shear layer of each phase (air and water), and to evaluate the turbulent momentum transport phenomena across air-water interface and from water near the interface to water-body flow. As the results of experiments, it is shown that the turbulent structure in an air layer is like a stream over a rough bed and that the water flow is a combined flow with a wall shear flow and orbital motions. In particular, as the wind blows stronger, it is well observed that the shape of an air-water interface changes dynamically and that the mechanism of water momentum transport is different from each case. It is clearly recognized by simultaneous LDA measurements that the time-series of raw air and water velocities and filter-conducted water velocities show some coherent busting phenomena with low frequent fluctuations
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