Abstract
This study describes an experimental investigation on turbulence characteristics and the water-surface fluctuations in adverse wind-driven open-channel flows by using both a laser Doppler anemometer (LDA) and a wave gauge simultaneously. Furthermore, a dissolved oxygen (DO) meter was used to investigate the gas transfer across the interface between the water and air.
In this study, it was shown that the velocity fluctuations of water flow near the interface in not only co-current flow but also adverse flow are affected significantly by the water-surface fluctuations in every range of frequency. However, turbulence characteristics and gas transfer phenomena in water layer in adverse wind-driven open-channel flows are different from those in the corresponding co-current flow, and there exists a high correlation between turbulence and the surface fluctuations in predominant frequency due to high-sheared wind flow.
