Abstract
The problem of impact entrainment is one of the central issues in understanding the process of saltation. In this paper, through improving the experimental scheme of Particle Image Velocimetry (PIV) and data processing methods using wind tunnel data, the measurement of sand particle lift-off and incident angles near the sand bed was achieved. Based on experimental data, we analyze the probability distribution of sand particle lift-off and incident angles and the influence of wind velocity and sand diameter on the probability distribution, as well as the relation between incident angle and lift-off angle. The results demonstrate that wind velocity and sand diameter have no obvious influence on the distribution shape of sand particle lift-off and incident angles. However, wind velocity will influence the decay constant and amplitude of the probability distribution. (c) 2013 Elsevier B.V. All rights reserved.
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