An evaluation of bed shear stress under turbid flows

Thompson, C.E.L., Amos, C.L., Angelaki, M., Jones, T.E.R. and Binks, C.E. (2006) An evaluation of bed shear stress under turbid flows Journal of Geophysical Research, 111, (C4), C04008-[8pp]. (doi:10.1029/2005JC003287).


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This paper investigates the effect of various turbidity levels on the drag coefficient and bed shear stress in decelerating flows over a smooth bed. Turbid flows were simulated in a laboratory annular flume (Lab Carousel) using clay suspensions of different known mass concentrations. Flow velocity measurements were taken in the turbulent boundary layer and the values of bed drag coefficient and shear stress were calculated using the method of flow deceleration. Results showed that the bed drag coefficient responds significantly to an increase in the suspended sediment concentration (up to 20 g\L) showing a decrease of up to 50% in drag due to turbulence suppression. However, subsequent increases in mass concentration resulted in an increase in the drag coefficient reaching the clear water value at approximately 200 g\L because of the influence of viscosity. Thus the application of the law of the wall in flows of high concentrations of suspended cohesive sediments up to 200 g\L results in overestimation of the bed shear stress.

Item Type: Article
Digital Object Identifier (DOI): doi:10.1029/2005JC003287
Additional Information: Index Terms: 4558 Oceanography: Physical: Sediment transport (1862); 4217 Oceanography: General: Coastal processes; 4599 Oceanography: Physical: General or miscellaneous.
ISSNs: 0148-0227 (print)
Related URLs:
Keywords: drag coefficient, bed shear stress, clay suspensions

ePrint ID: 28707
Date :
Date Event
April 2006Published
Date Deposited: 04 May 2006
Last Modified: 16 Apr 2017 22:25
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