Suspended load in flows on erodible bed

Bose, Sujit K. ; Dey, Subhasish (2009) Suspended load in flows on erodible bed International Journal of Sediment Research, 24 (3). pp. 315-324. ISSN 1001-6279

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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.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Sediment Transport; Fluvial Hydraulics; Suspended Load; Open Channel Flow
ID Code:70476
Deposited On:17 Nov 2011 04:33
Last Modified:11 Apr 2012 08:59

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