Modelling dispersion of particulate matter in the mining environment

摘要

This work examines the dispersion and deposition of particulate matter using Lagrangian modelling techniques. The particle trajectories are calculated by numerically solving Newton's equations of motion, while the wind velocity is modelled by means of a Lagrangian type model. At each instant the wind velocity is given by the sum of the average wind velocity and the turbulent wind fluctuations. The average wind velocity is obtained from the currently recommended wind profile for neutral atmospheric conditions, while the turbulent component, in each direction, is calculated by means of the Markov chain scheme. The results of simulation runs performed indicate that the effect of turbulence is very marked and leads to a large spread of particle landing positions downwind from the source. The comparison with scarce experimental data indicates that the proposed model is capable of quantitatively describing the ground-level concentration of particulate matter.