Modelling dispersion of particulate matter in the mining environment

摘要

This work examines the dispersion and depositionof particulate matter using Lagrangian modelling techniques.The particle trajectories are calculated by numerically solvingNewton's equations of motion, while the wind velocity ismodelled by means of a Lagrangian type model. At each instantthe wind velocity is given by the sum of the average windvelocity and the turbulent wind fluctuations. The average windvelocity is obtained from the currently recommended windprofile for neutral atmospheric conditions, while the turbulentcomponent, in each direction, is calculated by means of theMarkov chain scheme. The results of simulation runs performedindicate that the effect of turbulence is very marked and leads toa large spread of particle landing positions downwind from thesource. The comparison with scarce experimental data hadicatesthat the proposed model is capable of quantitatively describingthe ground-level concentration of particulate matter