SEMI-LAGRANGIAN MODEL OF ATMOSPHERIC DISPERSION - EVALUATION

Lisiane Ramires Meneses, Ricardo Carvalho Almeida

Abstract


A two-dimensional Semi-Lagrangian numerical model to simulate pollutant dispersion in the atmospheric boundary layer on flat terrain is tested. The model is based on the numerical solution of the advection-diffusion equation using a three-time-level Semi-Lagrangian scheme for the discretization of the advection term. The problem of pollutant dispersion in stable and unstable atmospheric conditions is investigated using two different parameterizations for the vertical turbulent diffusion coefficient. The performance of the model is discussed from the confrontation of the concentration values observed in the dispersion experiment of Prairie Grass with the ones simulated by the model. The statistical analysis shows that the model simulates the experimental data in a satisfactory way and presents results similar to the ones obtained by other authors using the models available in the literature.


Keywords


Atmospheric dispersion. Semi-Lagrangian method. Numerical solution. Advection-diffusion equation. Atmospheric boundary layer.



DOI: http://dx.doi.org/10.5902/2179460X20307

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