#BSNES SLOW DRIVERS#
Results show that concentration of PM10 (particles <10 μm, which are the most easily inhaled) behind an ORV can be as high as 160 mg m-3 or even more at nose level of quad drivers and passive recreants standing near an ORV trail. Fine as well as coarse-grained surfaces were investigated in the tests. Tests were performed with a 4-wheeler (quad), for 3 driving speeds between 24 and 40 km h-1 and for 7 different types of surfaces. Furthermore, the efficient and low-cost moisturized dust suppressant would be the future direction to develop in different mining areas.įield experiments were conducted in the Nellis Dunes Recreational Area (Nevada, USA) to study the dynamics of dust clouds produced by off-road vehicle (ORV) driving. The results of the migration of transportation dust and temporal–spatial distribution provide useful references for the analysis of dust source intension and pollutant diffusion in open-pit mines. Meanwhile, the dust concentration of a sprinkling pavement is as 10% as that of an un-sprinkling pavement. The dust concentration of a fully loaded vehicle is 2–3 times greater than that of a no-load vehicle. It takes 6 and 30 s after the vehicle had passed to achieve the maximum dust and baseline concentration, respectively.
The spatial concentration distribution of the dust clearly proves that the dust movement mode is a jumping mode. In the horizontal direction, the maximum dust and baseline concentration reached heights of 1–3 and 20 m away from the wheels, respectively, while they are obtained at heights of 0.5 and 2.2 m away from the pavement in the vertical distance, respectively. The results show that the dust concentration of the same horizontal distance from the pavement centerline remains roughly stable, which proves that the dust above the pavements is a continuous line source. To investigate the dust source of the most polluted equipment in the open-pit mine, this paper studied the temporal–spatial distribution laws of dust migration in the vehicle transportation pavements in the open-pit mine via theoretical analysis and a field test.
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