Numerical Simulation and Field Experiment Validation of Atmopheric Pollution Chemical Accidents Based on Canopy Model

In this work, the distribution of wind and dose fields after atmospheric pollution chemical accidents were simulated based on canopy model, and were validated by the field experiment observation data, the analysis provide important technical support timely and effectively when the chemical accidents happened in the community-scale. The validation between numerical simulation and field experiment showed that the concentration levels of simulated and observed agreed well under neutral and stable condition, most of the relative error of concentration is less than 1 times; the turbulence and diffusion were influenced by the surrounding buildings clearly, more obviously under stable condition than under neutral condition, the simulation results embodyed that there was a ‘S’-curve law for dose variation with time under the wind direction of chemical accidents at the same site.