The trajectory parameters analysis of saltating sand grains driven by wind

The study of trajectory parameters of saltating sand grains is of great importance to forming the kinematic theory of wind-sand current. By establishing the simplified theoretical pattern and probing into the relationship between lift-off angle (α) and landing angle (β), relationship between the ratio of saltation length (L) to maximum height (H) and lift-off angle as well as the angular variation laws of any point on the trajectory, it has been demonstrated that the relations among these parameters are nonlinear. Meanwhile, it has also been proved that the theoretical analysis is basically reliable in accordance with the wind tunnel experiments using high-speed multiflash photography. Generally, the trajectory shapes of saltating sand grains are controlled precisely and the theoretical analysis is closely combined with the experimental results.