Numerical Methods for Description of Convective Transport of Toxic Substances in Mathematical Prediction of the Quality of Environment in a Megalopolis

摘要

Modifications of two known methods designated for calculation of convective transport of toxic substances in the wind field under the conditions of urban zone and in regions with complex landscape are proposed. The methods are implemented in algorithms for calculation of temporal and spatial propagation of toxic substances from many sources of the large prognostic program system "TIMES". Special attention is paid to comparative analysis of the two versions of the methods developed by us: the grid—characteristic method and the particle-in-cell method.