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中国沙漠 ›› 1992, Vol. 12 ›› Issue (3): 1-9.

• 论文 •    下一篇

风积地貌形成的湍流理论

李后强, 艾南山   

  1. 四川大学物理系, 成都 610064
  • 出版日期:1992-09-20 发布日期:1992-09-20

Turbulent Theory for Wind-accumulated Landform Formation

Li Houqiang, Ai Nanshan   

  1. Department of physics, Sichuan University, Chengdu
  • Online:1992-09-20 Published:1992-09-20

摘要: 从分析风沙流的湍流特征出发,假定运动沙粒的集体行为是连续分布的沙幕,用Kdv-Burgers方程作为沙粒运动的规范方程,通过讨论行波解的性质发现风沙流具有"波粒两重性",沙丘的形态及发育除与风速有关外,主要决定于耗散性和色散性的相对大小。最后给出了新月形沙丘形成的一种新机制。

关键词: 风积地貌, 湍流, Kdv-Burgers方程, 耗散, 色散

Abstract: From Analysizing the turbulent characteristic of Wind-sand flow and Assuming the collective behavior of motion sands to be "Sand Curtain",the Kdv-Burgers equation may be used as the gauge equation of Sand movement,From the discussion of traveling wave solution it follows that the sand flow possesses wave-particle duality.The dune form and its evolution are mainly determinde by the relative ratio between dissipation and dispersion,in particlar the wind Velocity,Finally,this Paper suggests a new mechanism for the formation of barchan.