Numerical Simulation of Dust Distribution in City Tbilisi Territory in the Winter Period
Keywords:Numerical modeling, pollution source, dust distribution, western background wind, winter season
Dust propagation at Tbilisi city territory in the winter period during western background light wind is modeled and analyzed using 3D regional model of atmospheric process evolution and via combined integration of admixtures transfer and diffusion equations. The motor transport moving at city streets and highways is the main source of atmosphere pollution. Basic peculiarities featuring dust spatial propagation processes under complex terrain conditions are explored. The role of complex terrain in the passive admixture’s diffusion process is studied, urban zones with high dust pollution level are established, and the differences between air pollution spatial distribution in winter and summer seasons are determined. Time intervals, when high dust pollution level of the air is formed or air self-purification process occurs, are defined. Time and spatial change of dust concentration in the lower part of the atmospheric boundary layer is studied. It is obtained that 0.8-1.5 maximum allowable concentration (MAC) is registered at 9 AM and 6 PM at Gldani and Temqa district territories situated in the central and northeastern parts of the city.
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