【摘要】 通过对戈壁、流沙地表风沙流特性的风洞模拟实验研究,风沙流中的风速廓线分布满足幂函数的形式,其幂指数在0.20左右。对于戈壁地表,在不同风速下,相同高度层含沙量具有很大的相关性,风沙活动层主要集中在距地表20cm范围内;由于沙粒与戈壁地表的砾石发生碰撞,风沙流不再服从对数关系递减,其极值出现的高度随风速的增加而上移,呈现"象鼻效应"。更多还原

【Abstract】 The characteristics of sand-driving wind over Gobi / mobile sand surface have been investigated experimentally in the wind tunnel.It was found that for a given condition of underlying surface,pattern of wind velocity profile in sand flow conforms to the form of power function =azb and its power exponent is about 0.20.Sand contents under different wind conditions in the same height show a good correlation over Gobi surface,and the sand activities mainly focus on the range of 0-20cm above surface.Due to collision of sand grain with gravels on Gobi surface,the structure of sand flow does not increases logarithmically with height above the surface,and the height with the maximum value of sand content rises as wind velocity add.更多还原