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中文摘要：
通过对风成沙波纹和沙丘场形成和发展过程的三维定量模拟，再现出沙波纹的自修复过程和沙丘的碰撞过程．在此基础上，揭示出沙波纹及其“Y”形接头的自修复行为以及沙丘碰撞后出现包括类“孤波”在内的不同现象的主要规律，发现：沙波纹自修复时间会随摩阻风速的增大而缩短，而“Y”形接头的存在和粒径的增大都将延长沙波纹的自修复过程；沙丘间发生碰撞的后果与发生碰撞的两个沙丘的相对尺度以及它们连心线与风向的夹角有关，而类“孤波”现象的出现主要发生在相互碰撞的沙丘尺度比较接近且连心线与风向的夹角较小的情形．
英文摘要：
Three dimensional quantitative simulations on the formation and evolution of aeolian sand ripples and sand dunes are presented. The simulations successfully replayed the self-reparation behavior of sand ripples and the collision behavior of sand dunes. The simulation results revealed the dominant physical laws governing the self-reparation behavior of sand ripples and Y-junctions, and the phenomena that two aeolian barchan dunes collide with each other in a manner similar to solitons or solitary waves. The results indicate that the self-reparation time of sand ripple will reduce with the frictional wind speed increasing, and the existence of Y-junction and the increase of sand diameter will extend the self-reparation process of sand ripple. The collision＇s consequence between sand dunes is related with the two sand dunes relative scales and the angle between the line lock of center of dunes and wind direction. When the scales of two sand dunes are close and the angle between the line lock of center of dunes and wind direction is small, the solitary waves behavior will appear.
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