银川河东机场低空风切变气候特征统计及分型研究

文章统计银川河东机场大风分布特征,发现大风主要集中在西北风,东北风和西南风,西北风最多,当风向往西北风转变且风速增大时常有低空风切变;分析因低空风切变而复飞的航班,发现低空风切变主要集中在每年的3-5月,整体呈逐年增长趋势,而复飞航班的时间特征和低空风切变发生的时间呈正相关;总结近年来非常典型的10起低空风切变,发现不同年份的同一日发生风切变的可能性相当,并以以上样例为样本,根据低空风切变形成的直接系统分型研究,主要分为动量下传型,锋面过境型,对流性天气型和局地湍流型四种类型,发现动量下传型低空风切变是银川河东机场最主要的类型。

In this paper,the distribution characteristics of strong wind in Yinchuan Hedong airport are counted.It is found that the strong wind is mainly concentrated in northwest wind,northeast wind and southwest wind,and the northwest wind is the most.When the wind changes to northwest wind and the wind speed increases,there is often low-level wind shear;It is found that the low-level wind shear is mainly concentrated in March to May every year,and the overall trend is increasing year by year,while the time characteristics of the go around flight are positively correlated with the occurrence time of the low-level wind shear;Ten typical low-level windshear in recent years are summarized.It is found that the possibility of wind shear on the same day in different years is quite similar.Taking the above examples as samples,according to the direct systematic classification of low-level windshear,it is mainly divided into four types:momentum downward type,frontal transit type,convective weather type and local turbulence type.It is found that momentum downward type low-level windshear is the most important type of Yinchuan Hedong airport.