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A Study of the Performances of Different Turbulence Schemes in Numerical Simulation of Hydrodynamics of a Semi-Closed Sea (Persian Gulf)

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Complex process of turbulent mixing in Persian Gulf that is a semi-closed sea makes it a good media to test the performance of different turbulence schemes. In this research, we used the 3D ocean model COHERENS (COupled Hydrodynamical Ecological model for REgioNal Shelf seas) for the Persian Gulf with the open boundary in the Hormuz Strait. Of the turbulence schemes for the vertical diffusion available in the COHERENS, we tested four models to investigate the hydrodynamic characteristics of the Persian Gulf. The results show that all of the schemes presented the sea surface salinity (SSS) distribution rather accurately but the k-l and flow-dependent models results have better agreements with observations. The most noticeable difference between the results of four schemes is the differences found in the simulation of turbulent parameters. The turbulent closure schemes generally provide better results, but the algebraic schemes show turbulent parameters far from reality and they do not show substantial changes with time. Generally, the vertical structures of turbulence in the water basins and parameterization of turbulence in water column is very sensitive to the selection of the type of the turbulence scheme. However, large-scale structures that take place within the inflow and outflow area are approximately quasi-horizontal, and the vertical small-scale turbulence does not affect them as much. As a result, they show less sensitivity to the performance of various turbulence schemes.
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Keywords: COHERENS model; numerical simulation; the Persian Gulf; turbulence scheme

Document Type: Research Article

Affiliations: 1: Department of Marine Science and Technology, Science and Research, Islamic Azad University, Tehran, Iran 2: Institute of Geophysics, University of Tehran, Tehran, Iran 3: Soil Conservation and Watershed Management Research Institute, Tehran, Iran 4: Department of Physics, University of Isfahan, Isfahan, Iran 5: Department of Marine Science and Technology, Tehran North Branch, Islamic Azad University, Tehran, Iran

Publication date: March 3, 2016

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