河西走廊特殊地形与大风的关系探讨

运用河西走廊1951-2010年大风资料，参考相应地区的的地形特征，探讨了地形与大风发生的关系. 结果表明：地形的狭管效应对局地大风风速的突然加强是河西走廊多大风的重要原因，海拔是影响大风日数、最大风速和持续时间的重要因素. 祁连山的阻挡作用是造成山区北侧大风日数偏少、最大风速偏小和持续时间偏短的重要因素；地形与河谷走向是影响大风风向的重要因素.

Study of the relationship between gale and the peculiar terrain in the Hexi Corridor

Relationship between terrain and gale occurred in the Hexi Corridor was discussed by using wind information in the Hexi Corridor from 1951 to 2010 and considering relevant topographic features. It is found that the major reason for suddenly strengthening local gale in Hexi Corridor is the canal effect of terrain. Gale days, maximum wind speed and duration depend on a lot of factors, of which the controlling factor is altitude. Less wind days, lower maximum wind speed and shorter wind duration are due to a lot of factors, of which the significant one is that the gale is obstructed by the Qilian Mountains. Gale direction depends on a lot of factors, of which the controlling one is the terrain and valley direction.