Modeling the Dispersion of Pollutants in the Atmosphere, Accounting for Terrain and Meteorological Conditions
DOI:
https://doi.org/10.71310/pcam.4_68.2025.01Keywords:
advection-diffusion, Pasquill-Gifford, Monin-Obukhov length, wet deposition, sedimentation (Stokes), vegetation sinks, terrain, Upwind/QUICK, CFLAbstract
This work proposes an expanded 3D Euler model for calculating the spatiotemporal evolution of pollutant concentrations released into the atmosphere under changing meteorological conditions. The model, alongside the advection-diffusion equation, combines in a single system: Stokes’ law deposition (for solid particles), temperature-dependent chemical decomposition according to Arrhenius’ law, retention by plants (passive sink), precipitation washout (rainout), terrain-dependent resistance, and parameterization of turbulent diffusion based on Pasquill-Gifford stability classes. The numerical solution employs upwind/QUICK convective fluxes, central difference diffusion, and a time step stabilized by the CFL criterion. Scenarios covering various wind directions and speeds demonstrate the role of terrain in flow direction and atmospheric-related dispersion characteristics. The model is mass-balanced.
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