Numerical study on pollutant transport in Dalian bay based on hydrodynamic model

International Conference on Energy Engineering and Environmental Protection 2016

能源学;生态环境科学

Qiao, Huiting^1 ; Li, Jin^2 ; Zhang, Hongxing^1 ; Zhao, Kaibin^1 ; Zhang, Mingliang^1

School of Ocean Science and Environment, Dalian Ocean University, Dalian, Liaoning

116023, China^1

Yuanyanggou National Ocean Park, Panjin, Liaoning

124010, China^2

关键词: Coastal water environments;    Conservation of mass;    Hydrodynamic characteristics;    Pollutant transport;    Pollutant transport modeling;    Second-order accuracy;    Spatial and temporal distribution;    Two-dimensional hydrodynamics;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/52/1/012094/pdf
DOI  :  10.1088/1742-6596/52/1/012094

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Based on the depth-averaged two-dimensional shallow water and pollutant transport equation, the coupling model of water flow and water quality with explicit scheme is developed in this study. The unstructured triangular grid is adopted to locally refine the mesh around sewage outlet or in high-gradient regions of terrain change for the coupling model. The finite volume method is applied to ensure the conservation of mass for each element. This hydrodynamic model applies the Roe solver approximate Riemann solution with second-order accuracy to compute the water momentum flux on the grid interface. Taking Dalian Bay as the research object, the numerical model established is used to simulate the hydrodynamic characteristics and pollutant transport process. The computed results of the tide level, flow current and flow direction agree well with the measured data in Dalian Bay. The spatial and temporal distribution of pollutant in water are analyzed and discussed in this study. Simulated results show that the two-dimensional hydrodynamic and pollutant transport model can accurately simulate the mass transport in coastal waters, and it can provide a scientific basis on coastal water environment protection for the research water.