CALCULATION OF ATMOSPHERIC AIR POLLUTION IN CASE OF CHEMICALLY DANGEROUS SUBSTANCE SPILL

Abstract

Problem statement. The task of forecasting for chemical pollution areas at the industrial site during atmospheric inversion and chemically hazardous substance evaporation from the spill zone is considered. The purpose of the work is to develop a method for calculating the intensity and shape of pollution areas in the atmosphere that are formed under inversion conditions. Methodology. The three-dimensional impurity transport equation is used to calculate the atmospheric spread of chemically hazardous substances under inversion conditions, together with the M. Berland’s approach, to determine the vertical diffusion coefficient for this adverse meteorological condition. Numerical integration of the impurity transfer equation is realised using two finite-difference schemes. Both schemes are based on the splitting method. Results. An effective calculating method of atmospheric pollution areas formed during the evaporation of a chemically hazardous substance from the spill zone is proposed. A computer code to allow quick determination of these atmospheric pollution zones under inversion conditions is developed. The results of the computational experiment are presented. Scientific novelty. A method is developed to assess the size and intensity of chemical pollution zones formed in the atmosphere during inversion and evaporation of the substance from the spill area. Practical value. Based on the developed method, a code for a computational experiment to assess atmospheric pollution zones at industrial sites during emergency spills of chemically hazardous substances is generated.