Suspended load in flows on erodible bed |
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Authors: | Sujit K BOSE Subhasish DEY Visiting Fellow |
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Institution: | [1]Visiting Fellow, Department of Civil Engineering, Indian Institute of Technology, Kharagpur 721302, West Bengal, India [2]ChairProf., Department of Civil Engineering, Indian Institute of Technology, Kharagpur 721302, West Bengal, India |
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Abstract: | Steady state suspended-load of sediment transported in flow over erodible beds usually is treated by the advection-diffusion approach, though in recent years, it is being treated as a two-phase flow phenomenon incorporating kinetics of sediment particles. Among the advection-diffusion approaches, Rouse's (1937) equation is the well-known, although a number of researchers in later periods have attempted to improve it by modifying the mixing length concept taking into account other aspects. In this paper, the advection-diffusion approach and associated logarithmic law of flow velocity are revisited. It is concluded from the logarithmic law that the Reynolds shear stress is a linear function of height above the bed, which reduces to bed shear stress in the case of a long horizontal channel. As a consequence, it is shown that the volumetric concentration of sediment is best approximated by the sum of two power laws of height above the bed. An equation is derived for the suspended-load transport rate in terms of elementary functions. |
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Keywords: | Sediment transport Fluvial hydraulics Suspended load Open channel flow |
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