[Relationship between wind velocity and PM10 concentration & emission flux of fugitive dust source]

In the emission factor models of man-made fugitive dust, the wind velocity parameter has little been accounted for. PM10 concentration and wind velocity were measured near a unpaved road and in a construction site. PM10 emission flux was calculated using the measured data. The relationship between PM10 concentration and emission flux and wind velocity was studied. The results show that the PM10 concentration is high in the condition of static and slight wind. PM10 concentration descend with the wind velocity increased, and the concentration reaches to the minimum value when the wind velocity reach to 1.0-2.0 m/s, then with the wind velocity increasing (> 1.0-2.0 m/s), the PM10 concentration increases quickly. The emission flux increased with the wind velocity increasing, and the speed increasement become more after the wind velocity was faster than 2.0 m/s. The man-made fugitive dust was divided into mechanism operation and wind erosion dust to research the emission mechanism. The results based on theory analysis and the measured data are consistent.