Numerical Modelling of Dust Propagation in the Atmosphere of Tbilisi City in Case of Western Background Light Air
Tbilisi, a large city of the South Caucasus, is a junction point connecting Asia and Europe, Russia and republics of the Asia Minor. Over the last years, its atmosphere has been experienced an increasing anthropogenic load. Numerical modeling method is used for study of Tbilisi atmospheric air pollution. By means of 3D non-linear non-steady numerical model a peculiarity of city atmosphere pollution is investigated during background western light air. Dust concentration spatial and time changes are determined. There are identified the zones of high, average and less pollution, dust accumulation areas, transfer directions etc. By numerical modeling, there is shown that the process of air pollution by the dust proceeds in four stages, and they depend on the intensity of motor traffic, the micro-relief of the city, and the location of city mains. In the interval of time 06:00-09:00 the intensive growth, 09:00-15:00 a constancy or weak decrease, 18:00-21:00 an increase, and from 21:00 to 06:00 a reduction of the dust concentrations take place. The highly polluted areas are located in the vicinity of the city center and at some peripherical territories of the city, where the maximum dust concentration at 9PM is equal to 2 maximum allowable concentrations. The similar investigations conducted in case of various meteorological situations will enable us to compile the map of background urban pollution and to elaborate practical measures for ambient air protection.Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 18
 A. Amiranashvili, T. Bliadze, V. Tsikhladze, Photochemical smog in Tbilisi. Monograph. In Proc. of Mikh. Nodia Institute of Geophysics, Part 63, 2012, p. 160 (ISSN 1512-1135).
 D. Kirkitadze, G. Nikiforov, A. Chankvetadze, G. Chkhaidze, Some Results of Studies of Atmospheric Aerosols in M. Nodia Institute of Geophysics in the Recent Three Decades. Trans. of Mikheil Nodia Institute of Geophysics (ISSN 1512-1135), vol. 66, pp. 178-185, Tbilisi, 2016 (in Russian).
 A. Surmava, L. Intskirveli, V. Kukhalashvili, N. Gigauri, Numerical Investigation of Meso- and Microscale Diffusion of Tbilisi Dust, Annals of Agrarian Science, vol. 18, No. 3, 2020, pp. 293-300.
 A. Surmava, V. Kukhalashvili, N. Gigauri, L. Intskirveli, G. Kordzakhia, Numerical Modeling of Dust Propagation in the Atmosphere of a City with Complex Terrain. The Case of Background Eastern Light Air. Journal of Applied Mathematics and Physics, vol. 8, No.7, 2020, pp. 1222-1228. https://doi.org/10.4236/jamp.2020.87092.
 V. Kukhalashvili, G. Kordzakhia, N. Gigauri, A. Surmava, L. Intskirveli, Numerical Modelling of Dust Propagation in the Atmosphere of Tbilisi City: I. The Case of Background Eastern Gentle Breeze, Journal of the Georgian Geophysical Society, vol. 23(1), 2020, pp 46-50.
 V. Kukhalashvili, N. Gigauri, A. Surmava, D. Demetrashvili, L. Intskirveli, Numerical Modelling of Dust Propagation in the Atmosphere of Tbilisi City: II. The Case of Background Eastern Fresh Breeze, Journal of the Georgian Geophysical Society, vol. 23(1), 2020, pp. 51 -56.