Parameterization of Time-Averaged Suspended Sediment Concentration in the Nearshore

Water

Hyun-Doug Yoon³  Daniel Cox¹  Nobuhito Mori² 

[1] School of Civil and Construction Engineering, Oregon State University, Corvallis, OR 97331, USA; E-Mail:;Disaster Prevention Research Institute, Kyoto University, Uji, Kyoto 611-0011, Japan; E-Mail:;Department of Civil and Environmental Engineering, Myongji University, Gyeonggi-do, Yongin 449-728, Korea

关键词: turbulence;    suspended sediment concentration;    surf zone;    wave breaking;   

DOI  :  10.3390/w7116228

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.