Abstract
The aim of this work is to present a transient model in low wind conditionsto simulate the pollutants dispersion in the atmosphere. The dispersion model is based in the advection-diffusion equation and it considers the zonal and meridional components of the wind. The transient advection-diffusion equation is solved using integral transform techniques. In this work, the generalized integral transform and Laplace techniques are used, known in the literature as GILTT and which applied to the three-dimensional problem is called 3D-GILTT (Three-dimensional Generalized Integral Laplace Transform Technique). To validate the model, data from INEL experiment (Idaho National Engineering Laboratory) carried out in the USA were used. The model simulates the observed concentrations in a satisfactory way and can be used for regulatory air quality applications
Highlights
The pollutants dispersion, considering a short time range, from sources close to the surface is essentially determined by movements and processes of small scale that occur in the Planetary Boundary Layer (PBL)
This is in according with expectations, when the meridional wind speed is considered, a more realistic PBL physics is being take into account
The model is based on the three-dimensional transient advection-diffusion equation and the 3D-Generalized Integral Laplace Transform Technique (GILTT) technique was used to obtain the problem solution
Summary
The pollutants dispersion, considering a short time range, from sources close to the surface is essentially determined by movements and processes of small scale that occur in the Planetary Boundary Layer (PBL). Variations in the depth and structure of the boundary layer occur with frequency as a result of the evolution and displacement of mesoscale and synoptic scale systems. The boundary layer becomes more slim under the influence of large scale subsidence and horizontal divergence at low levels associated with the displacement of a high pressure system (anticyclone). The PBL can grow to great depths and merge with deep clouds in disturbed weather conditions that are associated with low pressure systems. The air pollution has been treated as a serious problem for large cities and shopping centers. Due to the problems caused by air pollution, it is necessary to study and understand the process of pollutants dispersion to predict the possible consequences of the environmental impact on the various ecosystems
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