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Water 2015, 7(11), 6228-6243;

Parameterization of Time-Averaged Suspended Sediment Concentration in the Nearshore

Department of Civil and Environmental Engineering, Myongji University, Gyeonggi-do, Yongin 449-728, Korea
School of Civil and Construction Engineering, Oregon State University, Corvallis, OR 97331, USA
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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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

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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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