MODELLING OF 3D SEDIMENT TRANSPORT IN THE SURF ZONE

Proceedings of the International Conference on Coastal Engineering

Erisk Asp Hansen¹  Ida Broker¹  Peter Justesen¹  Rolf Deigaard²  Berry Elfrink¹ 

[1] Danish Hydraulic Institute;Institute of Hydrodynamics and Hydraulic Engineering, Technical University of Denmark

关键词: surf zone;    sediment transport;    3D transport;    transport modeling;   

DOI  :  10.9753/icce.v25.%p

学科分类：建筑学

来源: Coastal Engineering Research Council

【 摘 要 】

The three-dimensional sediment transport in the surf zone has been investigated using two different approaches for modelling of the flow pattern. The first approach is based on the integrated momentum concept for the turbulent wave-current boundary layer, see Fredsoe (1984), the second approach is based on the k-model, as described in Deigaard et al. (1991). The k-model allows for a more consistent description of the time and space varying eddy viscosity than the integrated momentum approach, but demands considerably more computation effort. The driving forces are calculated according to the formulations of Deigaard et al. (1991) and Deigaard (1993). The model based on the integrated momentum equation is able to reproduce the details of the flow satisfactorily. The presence of a longshore current increases the turbulence near the bed. This results in a decreased offshore directed flow velocity near the bed and an increase in the sediment concentration. Comparisons with field measurements show good agreement.

【 授权许可】

Unknown