2000 Volume 44 Pages 891-896
The relationship was evaluated between the increase of surface area and the gas transfer coefficient across the interface in two-layer flows by using cross-correlation coefficients evaluated from two sets of ultrasonic depth-measuring instruments in comparison with VTR. It was clarified that the surface area has little effect on gas transfer in smooth-bed flow against former studies. Furthermore, it became clear that the smaller-scale eddies contribute greatly to the greater gas transfer in open-channel flow than those in wind-wave. These findings can be used for evaluating gas transfer in actual river only by the spectrum of surface-wave.
