The trajectory parameters analysis of saltating sand grains driven by wind

The study of trajectory parameters of saltating sand grains is of great imp ortance to forming the kinematic theory of wind-sand current. By establishi ng the simplified theoretical pattern and probing into the relationship bet ween lift-off angle (alpha) and landing angle (beta), 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 ha s been demonstrated that the relations among these parameters are nonlinear . Meanwhile, it has also been proved that the theoretical analysis is basic ally reliable in accordance with the wind tunnel experiments using high-spe ed multiflash photography. Generally, the trajectory shapes of saltating sa nd grains are controlled precisely and the theoretical analysis is closely combined with the experimental results