Numerical modeling of cohesive sediment transport in a tidal bay with current velocity assimilation

Peng Zhang, Wing Hong Onyx Wai, Jianzhong Lu, Xiaoling Chen

Research output: Journal article publicationJournal articleAcademic researchpeer-review

1 Citation (Scopus)

Abstract

Tidal currents play an important role in sediment dynamics in coastal and estuarine regions. The goal of this study is to investigate the effects of current velocity assimilation (CVA) on sediment transport modeling in tide-dominated waters. A hydrodynamic and sediment transport model for Deep Bay, Hong Kong, was established based on a three-dimensional primitive equation Finite Volume Coastal Ocean Model. An additional numerical simulation was conducted with in situ current velocity measurements sequentially assimilated into the model using a three-dimensional optimal interpolation scheme. The performance of CVA shows improvements in the rootmean- square errors and average cosine correlations of simulated current velocity by at least 9.1 % and 10.3 %, respectively. Moreover, the root-mean-square error of the simulated sediment concentration from the model with CVA was decreased by at least 7 %. A reasonable enhancement in the vertical and spatial distributions of sediment concentrations was demonstrated from the simulation results from the model with CVA. It was found that the bottom shear stress changed significantly when the simulated velocities were corrected with CVA. The results suggest that CVA has the potential to improve sediment transport prediction because tidal currents dominate sediment dynamics in the studied areas.
Original languageEnglish
Pages (from-to)505-519
Number of pages15
JournalJournal of Oceanography
Volume70
Issue number6
DOIs
Publication statusPublished - 1 Jan 2014

Keywords

  • Current velocity assimilation
  • Deep bay
  • FVCOM
  • Numerical model
  • Sediment transport

ASJC Scopus subject areas

  • Oceanography

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