邢台市焚风时空特征分析

Analysis of Temporal and Spatial Characteristics of Foehn in Xingtai City

邢台地区位于太行山南段东侧,受焚风影响强烈。选择邢台市2011—2020年18个国家站正点气温、相对湿度、10 min平均风向和10 min平均风速4种气象要素逐小时数据,运用统计学和GIS空间分析方法,依据DB13/T 1271—2010《太行山东麓焚风等级》标准,对邢台市焚风的时空特征进行分析研究。结果表明:(1)在时间分布上,焚风和较强焚风的年度发生时次变化幅度较低;季度发生时次差异明显,春季最多占焚风总发生时次的49.6%;月度分布看,3、4、5月发生时次最高,7、8月最低。(2)在空间维度上,焚风影响邢台全域,焚风发生高值位于邢台市西南部,较强焚风自西向东主要影响太行山以东50 km,有明显的梯度特征;不同季节焚风时次的空间分布虽然差异明显,但是高值均位于邢台西南部,低值位于邢台中部地区。

The Xingtai area,located to the east of the southern part of Taihang Mountains,is strongly affected by the Foehn.Hourly data of four meteorological elements,including positive temperature,relative humidity,10-minute mean wind direction and 10-minute mean wind speed,were selected from 18 national stations in Xingtai city from 2011 to 2020.Combined with DB13/T 1271—2010“Standards for foehn at the eastern foot of Taihang Mountain”,this paper analyzed the temporal and spatial characteristics of Foehn in Xingtai by using statistical and GIS spatial analysis methods.The results show that the temporal variation of Foehn wind and strong Foehn wind is insignificance,the seasonal variation is obvious,spring accounts for 49.6% of the total foehn wind,the highest occurred in March,April and May,the lowest in July and August.In spatial dimension,Foehn winds affect the whole area of Xingtai,the high Foehn winds are located in the southwest,the strong Foehn winds from west to east mainly affect 50 km east of Taihang Mountains,which has obvious gradient characteristics;The spatial distribution of Foehn times in different seasons is obviously different,but the high values are all in south-west Xingtai and the low values are in central Xingtai.