Development of a quasi-2D model on suspended sediment transport in surf zone

S. Rahman, Akira Mano, K. Udo

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Wave-breaking induced turbulence strongly affects sediment transport in coastal area. A Boussinesq model has been extensively developed to simulate wave breaking. An artificial viscosity approach is one method to describe energy dissipation due to wave-breaking in this model. However, this type of viscosity cannot be directly used to simulate the sediment transport. Reynolds stress equation has been used to derive relationship between artificial viscosity and eddy viscosity. The proposed eddy viscosity model has been validated against a set of experimental data of spilling breaker case. In this study, this model is validated against plunging breaker case. The validation is conducted by comparing calculated results and laboratory data in terms of wave decay, water surface fluctuation, water particle velocity and sediment concentration. This comparison shows that the proposed eddy viscosity model under predicted the breaking point for plunging breaker case. However, this model predicted wave decay in surf zone more accurate than Kennedy's model. Comparison between calculated and experimental data shows that the proposed model can predict sediment concentration fairly good in shoaling and breaking zone. The discrepancy between calculated and measured of sediment concentration profile in surf zone due to the under prediction of energy dissipation in this area.

Original languageEnglish
Pages (from-to)1160-1164
Number of pages5
JournalJournal of Coastal Research
Issue numberSPEC. ISSUE 64
Publication statusPublished - 2011 Dec 1

Keywords

  • Eddy viscosity
  • Sediment diffusion
  • Settling velocity
  • Wave decay

ASJC Scopus subject areas

  • Ecology
  • Water Science and Technology
  • Earth-Surface Processes

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