Analysis on the Motion of Wind-Blown Sand Grains Using a High-Speed Digital Imaging Camera

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  • FUJISAWA Hideyuki
    Road Approval Section, General Affairs Department, Sapporo City Construction Bureau
  • KUBOTA Susumu
    Department of Civil Engineering, College of Science and Technology, Nihon University

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The motion of wind-blown sand grains was photographed by a high-speed digital imaging camera in a large blow-off type wind-tunnel under realistic conditions. Well-sorted sands taken from a natural beach and sieved with median diameters (d50) of 0.15, 0.25, 0.52, 0.68 mm were employed. The horizontal component of the flying sand grain velocity, ūs, was slower than wind speed, u at the same elevation. Above the certain height from the sand surface, the sand velocity became nearly to the wind velocity with the height. These results yielded the following empirical equation; ūs/u=0.168ln(z/d50)-0.139 (z; height from the sand surface). For the sand with a median diameter of 0.68 mm (U=11.8m/s), the approximate values of 2.0 m/s and 10-20 degrees were obtained for the falling velocity and angle, respectively, and 1.0 m/s and 20-50 degrees for the rebound velocity and angle, respectively.

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