敦煌戈壁地表风蚀起沙量的计算

Calculation of Dust Emission by Wind Erosion in Dunhuang Gobi Surface

利用三种不同的计算方案,根据敦煌地区的观测资料,计算了2002年4月8日沙尘天气过程中戈壁地表的风蚀起沙量(垂直尘粒通量)。结果表明:三种方法的计算结果比较接近;在风蚀起沙较严重的时段内,顺风向沙粒通量和垂直尘粒通量平均值的量级分别为10-4kg·m-1·s-1和10-8kg·m-2·s-1。通过计算结果和观测结果的比较,在地面风蚀起沙物理机制的基础上,讨论了三种计算方案各自的优缺点。

Using the observational data of Dunhuang, the dust emission (vertical dust flux) by wind erosion in Gobi surface on April 8, 2002 is calculated through three different schemes in this paper. The results indicate that the values of three schemes are very approximate, and the magnitude of downwind sand flux and vertical dust flux are 10^(-4)kg·m^(-1)·s^(-1)and 10^(-8)kg·m^(-2)·s^(-1) respectively when it is serious dusty weather. Comparing with the calculated and observed results and the physical mechanism of dust emission by wind erosion, the strongpoints and limitations of the three schemes are discussed.