DECELERATING OPEN-CHANNEL FLOW IN A GRADUAL EXPANSION
The velocity and turbulence distributions of decelerating open-channel flow in a gradual expansion were measured using LDV equipment. The results show that the logarithmic law can describe the mean velocity in the bottom region well while the Coles’ law can be applied to the outer region. The shear velocity can be determined both by the logarithmic fit of the mean velocity and by the fit of the Reynolds stress distributions. The turbulence intensities reach their maximum values at z/h = 0.1 to z/h = 0.15. The turbulence intensities do increase along the expansion, especially in the outer region. This is more pronounced for larger Reynolds numbers. Both turbulence intensity and Reynolds stress distributions are found to deviate from the theoretical and empirical curves reported for uniform flow. This can be attributed to the secondary currents generated in the relatively narrow channel.
Nguyen Thanh Hoan Rob Booij Marcel J.F. Stive Henk Jan Verhagen
Delft University of Technology, Faculty of Civil Engineering and Geosciences, Section of Hydraulic E Delft University of Technology, Faculty of Civil Engineering and Geosciences, Environmental Fluid Me Delft University of Technology, Faculty of Civil Engineering and Geosciences, Section of Hydraulic E
国际会议
第四届亚太地区海岸会议(the Fourth International Conference on Asian and Pacific Coasts)
南京
英文
2007-09-21（万方平台首次上网日期，不代表论文的发表时间）