塔克拉玛干沙漠肖塘地区空气动力学粗糙度分析

利用塔克拉玛干沙漠北部肖塘地区梯度自动站2007年1月1日至2007年5月31日的观测数据，计算出该区域中性条件下粗糙度范围是1.00×10-11~1.65×10-3 m，平均粗糙度为6.05×10-5 m，接近沙粒粒径的1/30，与平坦沙面粗糙度相似。摩擦速度的范围是0.14~2.33 m·s-1，平均值1.24 m·s-1。粗糙度随下垫面性质变化明显，与稳定度呈正相关，与风速呈负相关，摩擦速度随粗糙度增大而减小。

Analysis on Aerodynamic Roughness in XiaoTang in the Taklimakan Desert

Based on the gradient observational data from January 1, 2007 to May 31, 2007 in the north of the Taklimakan Desert, aerodynamic roughness under condition of neutral stratification atmospheric in XiaoTang is calculated as between 1.00×10-11 to 1.65×10-3 m, the average is 6.05×10-5 m, close to 1/30 of the sand particle size and similar to that on flat sand bed; the range of friction speed is 0.14~2.33 m·s-1, averaged by m·s-1. Roughness changes obviously with the property of underlying surface, has positive correlation with stability, and negative correlation with wind speed. Friction velocity decreases with increasing roughness.