【摘要】 采用数值模拟的方法研究了沙粒冲击角对风成沙纹形成过程及其形态特征的影响。模拟中采用了均匀和正态两种冲击角分布情况。冲击角在10°～16°范围内均匀分布时,冲击角对沙纹波高影响不大,沙纹波长随冲击角影响系数的增加略有减小;沙粒跃移冲击角在5°～25°范围内呈正态分布时,冲击角影响系数增加时沙纹波高几乎没有变化,但沙纹波长却明显减小。更多还原

【Abstract】 We studied the effect of particle impacting-angle on development of aeolian ripples using numerical simulation method. Both uniform and normal distributions of impacting angles are considered in simulation models. The impacting angles for uniform distribution are ranged between 10°~16°and those for normal distribution are between 5°~25°. Ripple heights simulated from two distribution models of impacting angles are similar to those produced from a single impacting angle of 13°, but ripple lengths simulated decrease slightly for uniform distribution and obviously for normal distributions.更多还原