Mathematical Modeling of Diffusion and Transport of Pollutants in the Atmospheric Boundary Layer

Abstract

The process of dispersion of air pollutants, in a broad sense, can be considered as the net outcome of various mechanisms involved in the transport of air pollutants from the source to the receptor. The major mechanisms are: (1) advection of pollutants by mean air motion, (2) mixing of pollutants by atmospheric turbulence and (3) mass diffusion due to concentration gradients. In addition, the physical and chemical nature of the effluent, the location of the stack and the nature of the terrain downwind from the stack, effect the dispersion of the pollutants. Various physical and mathematical aspects related to the transport and diffusion of air pollutants in the atmospheric boundary layer are discussed here. Further, some aspects of dispersion in a weak wind stable boundary layer are described. Finally, the current issues in the modeling of weak wind boundary layer are illustrated.

Analysis of the Applied Flight Trajectory Influence on the Air Pollution in the Area of Warsaw Chopin Airport

“…Pollutants in the atmosphere, once released from an emission source, undergo various processes on which their concentration at a given place and time depends. These phenomena include dispersion processes such as pollutant advection, mixing of pollutants resulting from turbulent air movements, or mass diffusion processes resulting from differences in concentration gradients [22,23]. Of major importance in contaminant dispersion is horizontal air movement, i.e.…”

“…Pollutant transport can occur at different spatial scales. The division of scales is based on the phenomena that occur at a given distance from the emission source [22,26]:…”

“…The lowest layer of the atmosphere, extending from the earth's surface to an altitude of about 10-15 km, is the troposphere. The lowest part of the troposphere up to an altitude of about 1 km is the atmospheric boundary layer (ABL) [22,24], which is the most turbulent part of the troposphere [24]. Friction with the ground and heat are responsible for creating turbulence in ABL.…”

The process of distribution Computer modeling of hazardous substances in the atmosphere taking into account the terrain relief

“…The process of transport and diffusion of harmful substances in the atmosphere, considering various weather and climatic factors and external disturbances, was considered in [4].…”

Modeling the Dispersion and Atmospheric Mitigation of Pollutants in the Dibamba-Douala Thermal Power Plant

“…Predicted monthly mean concentrations were found to be Consequential to observations. (Sharan & Gopalakrishnan, 2003) studied the dispersion of air pollutants under weak wind conditions using a mathematical model on Delhi, (Sharan et al, 2000) using a three-dimensional mesoscale model showed that urban weather conditions had no major influence on the dispersion of hazardous chemical gases during the Bhopal gas accident. (Abdoulaye & Sodré, 2007) modeled the attenuation on the ground of the concentration of emissions from a diesel thermal power plant.…”