Spatial Distribution of Dust Concentration in Kakheti Atmosphere in Case of Nonstationary Sources of Pollution

Abstract

Using a regional model of atmospheric process in the Caucasus and equation of transfer-diffusion of passive contaminant the distribution patterns of dust dissipated in the atmosphere of Kakheti are obtained. It is shown that dust dissipated from cities in the atmosphere is basically concentrated in boundary layer. Maximum values of dust are concentrated  in 100 m surface air layer. Spatial dust distribution region increases and concentration decreases along with height increase. Urban influence zone is determined. It equals to 20-30 km for Tbilisi, approximately 10 km for Rustavi and for other cities does not exceed 2-4 km. Kinematics of dust propagation is studied. It is determined that in 2-100 m layer of atmosphere the process of turbulent diffusion take precedence in the process of dust propagation. From 100 m to 1 km the processes of diffusive and advective transfers are identical, while above 1 km the preference is given to advective transfer.