1009 うねりを伴う風波気液界面を通しての物質移動に関する研究(2)(OS10-2 大気海洋の流体現象と環境流体,OS10 大気海洋の流体現象と環境流体,オーガナイズドセッション)

Abstract

The effects of swell on mass transfer across the wind-driven air-water interface was investigated through laboratory experiments in a large wind-wave tank. The swell was mechanically generated and propagated in the same wind direction. The CO_2 transfer coefficients on the water side were measured at upwind region(x=4.0m) and downwind region(x=10.0m) through reaeration experiments of CO_2. The results show that CO_2 transfer coefficient for swell wind wave case decreases campared with that for pure wind wave case. Furthermore, the damping effect of swell is well correlated with the ratio of significant wave height for pure wind wave to that for swell irrespective of fetch, whereas that is poorly correlated with free-stream wind velocity U_∞. The damping effect of swell is distinguished in the case that the ratio of significant wave height for pure wind wave to that for swell is about 0.5.