广汉机场春季地面风的变化特征及其对飞行训练的影响

利用广汉机场2010~2014年遥测地面风场资料,分析了春季地面风的年变化、月变化以及日变化特征,讨论了地面风对飞行训练的影响。结果表明:广汉机场春季盛行偏北风,此外主要还受到北西北、北东北风的影响,飞行训练易遭遇左侧风;4~5m/s以及6m/s以上的地面风日数年变化不大,但春季最大风速的年变化差异较大;3~5月月平均地面风速呈递增特征,从3月到5月主导风向由北风顺时针变化为东北风,东东南、东南、南东南风频率逐渐增加,左侧风以及逆风影响增大。地面风速的日变化呈现出“一峰一谷”的大陆型变化特征,即白天风速大,夜间风速小,午后风速最大,4~5m/s的风受日变化影响大,6m/s以上的风主要受天气系统的影响。 

Characteristic Analysis on Surface Wind Field in Spring at Guanghan Airport and Its Influence on the Flight Training

Based on the observational surface wind data at Guanghan airport from 2010 to 2014, the annual variation, monthly mean and diurnal change characteristics of surface wind field in spring are analyzed, the results show that northerly winds prevail in spring, and the Guanghan airport is also influenced by the NNW and NNE wind, therefore the flight training can be influenced by the left crosswind. The days of wind speed which is between 4-5m/s and above 6m/s have little changes yearly, but the max wind speed in the spring has large yearly variation. The monthly mean wind speed increasing from March to May, dominant wind direction in March is northerly winds, it has turned into northeasterly winds in May, furthermore, the frequency of ESE, SE, SSE wind is increased, and the left crosswind and headwind also increased. Diurnal variation of surface wind has the characteristics of “one peak one valley”, which means the speed is large during the day, small during the night and largest in the afternoon. The wind between 4-5m/s is more influenced by the diurnal changes, the wind above 6m/s is mainly influenced by the weather systems.