风成跃移模拟的一种数值方法

A new numerical scheme for aeolian saltation simulation

在Ungar模型的理论基础上,给出吹过无限大平坦沙床面的稳定风场中,风和跃移沙粒相互耦合作用下沙粒二维跃移轨迹的一种计算格式,并利用给出的计算格式对模型进行求解.通过预先设定沙粒起跳速度大小和方向,调整跃移轨迹顶端沙粒水平速度和最大跃移高度,使计算得出的沙粒起跳速度与设定值吻合,以此确定沙粒跃移轨迹,这种计算格式可以计算任意起跃角和任意起跳速度沙粒的跃移轨迹.计算结果与Ungar模型的计算结果非常吻合,这一计算格式拓展了风沙跃移数值模拟的计算方法.

A new numerical scheme for coupled equations of steady state saltation movement over an in- finite plane is presented. This scheme is based on Ungar＇ s simplified model of the grain-surface impact process. Saltation trajectory with different ejecting angle can be obtained by using this scheme. The numerical results show that this numerical scheme corresponds well with that of Ungar. Hence, and it expanded the practicable numerical scheme for aeolian saltation simulation.