风积地貌形成的湍流理论

Turbulent Theory for Wind—accumulated Landform Formation

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。

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.