河西走廊特殊地形与大风的关系探讨  

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

作　　者：董安祥[1] 胡文超 张宇[1] 刘德祥[3] 

机构地区：[1]中国气象局兰州干旱气象研究所/甘肃省干旱气候变化与减灾重点实验室/中国气象局干旱气候变化与减灾重点实验室,甘肃兰州730020 [2]甘肃省气象服务中心,甘肃兰州730020 [3]西北区域气候中心,甘肃兰州730020

出　　处：《冰川冻土》2014年第2期347-351,共5页Journal of Glaciology and Geocryology

基　　金：中国气象局业务项目"气候变化情景下甘肃省未来40年干旱灾害发生趋势";中国电力工程顾问集团公司技术成果"西北特殊地域大风特性及线路设计研究"(DG1-D03-2011);国家发改委专项"甘肃应对气候变化规划思路研究"(1213042)资助

摘　　要：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.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.

关 键 词：河西走廊 特殊地形 大风 狭管效应 

分 类 号：P425.4[天文地球—大气科学及气象学]