TIME-AVERAGED TURBULENT MIXING AND VERTICAL CONCENTRATION DISTRIBUTION OF HIGH-DENSITY SUSPENSIONS FORMED UNDER WAVES
No. 32 (2010), Sediment Transport and Morphology
No. 32 (2010)

TIME-AVERAGED TURBULENT MIXING AND VERTICAL CONCENTRATION DISTRIBUTION OF HIGH-DENSITY SUSPENSIONS FORMED UNDER WAVES

Sediment Transport and Morphology
https://doi.org/10.9753/icce.v32.sediment.20
Published 2011-01-31
Bing Yan
Tianjin Research Institute of Water Transport Engineering
Qing-He Zhang
Tianjin University
Michael Lamb
California Institute of Technology
Proceedings of the 32nd International Conference
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Keywords

high density suspension
vertical concentration distribution
turbulent mixing
turbulent kinetic energy
waves
silt

How to Cite

Yan, B., Zhang, Q.-H., & Lamb, M. (2011). TIME-AVERAGED TURBULENT MIXING AND VERTICAL CONCENTRATION DISTRIBUTION OF HIGH-DENSITY SUSPENSIONS FORMED UNDER WAVES. Coastal Engineering Proceedings, 1(32), sediment.20. https://doi.org/10.9753/icce.v32.sediment.20
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Abstract

We analyzed oscillating flow data from U-tube experiments by Lamb et al. (2004) and found that the time-averaged turbulent kinetic energy (TKE) near bed decreased exponentially with height above the bed in high-density-suspension (HDS) flows under waves, and that the ratios of TKE distributions in the streamwise, cross-stream, and vertical dimensions were constant. Based on the finite-mixing-length theory, a semi-theoretical time-averaged suspended sediment concentration model for HDS was developed. To avoid the stability problems with the numerical solution, a simplified model was also formulated through combing the apparent Fickian diffusivity and the damping function. The comparison between the calculated results and measurements shows both models consider the effect of the sediment-induced stratification well.
https://doi.org/10.9753/icce.v32.sediment.20
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