Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/66343
Title: Turbulent velocity profiles in sediment-laden flows
Authors: Guo, J. 
Julien, P.Y.
Issue Date: 2001
Source: Guo, J.,Julien, P.Y. (2001). Turbulent velocity profiles in sediment-laden flows. Journal of Hydraulic Research 39 (1) : 11-23. ScholarBank@NUS Repository.
Abstract: A theoretical analysis shows that velocity profiles in sediment-laden flows are similar to those in clear water. The modified log-wake law, which is developed for clear water by Guo, is also valid in sediment-laden flows. The analysis of the effects of sediment suspension on turbulent kinetic energy and turbulent diffusion shows that: (1) sediment suspension increases mean flow energy loss; (2) sediment suspension weakens turbulent diffusion in the vertical direction and then increases velocity gradient; and (3) sediment suspension affects velocity profile in two ways: average concentration and density gradient. The comparison with narrow-channel laboratory data confirms the theoretical analysis and shows that: (1) the modified log-wake law agrees well with experimental data for sediment-laden flows; (2) both average concentration and density gradient reduce the von Karman constant; and (3) for a given width-depth ratio, sediment concentration slightly increases the wake strength while density gradient has little effect on it. In addition, the modified log-wake law can reproduce experimental data where the maximum velocity occurs below the water surface.
Source Title: Journal of Hydraulic Research
URI: http://scholarbank.nus.edu.sg/handle/10635/66343
ISSN: 00221686
Appears in Collections:Staff Publications

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