关键词: 跃高, 跃距, 起跳角, 沉降角

Abstract: The study for the movement and the related parameters of saltating sand grains is strengthened by the high-speed photography technique. But it has limitation due to the imperfection of image-forming point. The defect can be covered by fitting the trajectory path of saltating sand grains with smooth curve. The trajectory of the saltating sand grain taken by the high-speed photography is analyzed with fitting curve method in this paper. The parameters launch angle θ₀, maximum height H₁ and maximum path length L₁ of ascending trajectory path, collision angle θ_t, maximum height H₂ and maximum path length L₂ of descending trajectory path are counted out from the fitting curve equation. Statistic analysis is used for all the parameters. The result of functions is yielded in by this way and it supplies further studies on the course of motion of saltating grains.

Key words: maximum height, maximum path length, launch angle, collision angle