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Water 2015, 7(11), 6228-6243; doi:10.3390/w7116228

Parameterization of Time-Averaged Suspended Sediment Concentration in the Nearshore

1
Department of Civil and Environmental Engineering, Myongji University, Gyeonggi-do, Yongin 449-728, Korea
2
School of Civil and Construction Engineering, Oregon State University, Corvallis, OR 97331, USA
3
Disaster Prevention Research Institute, Kyoto University, Uji, Kyoto 611-0011, Japan
*
Author to whom correspondence should be addressed.
Academic Editor: Miklas Scholz
Received: 7 September 2015 / Revised: 27 October 2015 / Accepted: 27 October 2015 / Published: 6 November 2015
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Abstract

To quantify the effect of wave breaking turbulence on sediment transport in the nearshore, the vertical distribution of time-averaged suspended sediment concentration (SSC) in the surf zone was parameterized in terms of the turbulent kinetic energy (TKE) at different cross-shore locations, including the bar crest, bar trough, and inner surf zone. Using data from a large-scale laboratory experiment, a simple relationship was developed between the time-averaged SSC and the time-averaged TKE. The vertical variation of the time-averaged SSC was fitted to an equation analogous to the turbulent dissipation rate term. At the bar crest, the proposed equation was slightly modified to incorporate the effect of near-bed sediment processes and yielded reasonable agreement. This parameterization yielded the best agreement at the bar trough, with a coefficient of determination R2 ≥ 0.72 above the bottom boundary layer. The time-averaged SSC in the inner surf zone showed good agreement near the bed but poor agreement near the water surface, suggesting that there is a different sedimentation mechanism that controls the SSC in the inner surf zone. View Full-Text
Keywords: turbulence; suspended sediment concentration; surf zone; wave breaking turbulence; suspended sediment concentration; surf zone; wave breaking
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Yoon, H.-D.; Cox, D.; Mori, N. Parameterization of Time-Averaged Suspended Sediment Concentration in the Nearshore. Water 2015, 7, 6228-6243.

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