Field Evaluation of Windscreens as a Fugitive Dust Control Measure for Material Storage Piles

摘要

The report gives results of a field study to validate earlier wind tunnel studies with respect to windspeed changes, and to determine the relationship between changes in windspeed and changes in fugitive dust emissions. (The earlier studies were to determine changes in windspeed--not changes in emissions--due to windscreens, and utilized a wind tunnel to determine the optimal windscreen porosity, size, and location for control of fugitive dust emissions from storage piles.) The field study suggests that the optimum windscreen design parameters are: porosity = 50%, height = 1.0 H, width = 5.0 D, and distance = 2.0 H for a conical pile of height H and diameter D. Analysis of the field data shows that emission rates were directly related to windspeed and inversely related to moisture content of the pile surface. These relationships held regardless of the particle size fraction considered.