Wind-tunnel experiment on dust dry deposition

Abstract

The PDPA technique is applied in a wind-tunnel experiment on dust dry deposition. Dust deposition velocity is derived from the PDPA measurements over four different (water, wood, sand and tree) surfaces. A reliable dataset is obtained for the validation of dust deposition schemes. It is found that the deposition velocities for particles larger than 0.5 mu m increase with particle size and friction velocity. For water surface, the dust deposition velocities for the particles in the size range of 0.5 to 10 mu m do not significantly differ from each other and the results are reasonably well predicted by the scheme of Slinn & Slinn (1980). Particles with diameter larger than 3 mu m are effectively deposited by impaction which is considered in the schemes (Slinn & Slinn, 1980