Abstract:

Based on the ground wind data observed by 4 automatic meteorological stations in the Haituo Mountain area of Beijing in winter half years of 2014 and 2015, the distribution characteristic of ground wind speed and wind direction over the Haituo Mountain division for the 24th winter Olympic games was analyzed. The results are as follows: (1) The ground wind field in each meteorological station had an obvious wind direction orientation and wind speed distribution interval characteristic, respectively. The A1492 station which was located in high altitude area, for example, its ground wind direction presented a significant four azimuth orientation feature from WSW to NW and the frequency of wind speed greater than 10.0 m·s-1 was about 49.1%. What’s more, its monthly average wind speed was greater than 10.0 m·s-1. (2) The maximum monthly average wind speed of all stations appeared in January and the minimum value of the other three stations appeared in March except for A1492 station, and for A1492 station it appeared in November. (3) The hourly wind speed of each station gradually increased from 08:00 am to 04:00 pm and decreased slowly from 04:00 pm to 06:00 am.

Key words: ground wind field, variation characteristic, the Haituo Mountain, the 24th winter Olympic games

摘要：

基于北京市海坨山赛区4个自动气象站2014、2015年冬半年地面风场资料，分析第24届冬奥会海坨山赛区冬季地面风场分布特征。结果表明：（1）各站冬季地面风场具有明显的风向取向以及风速值分布区间特征，其中海拔较高的A1492站风向呈明显的西西南至西北4个方位取向，10.0 m·s-1以上风速的发生频率约为49.1%,月平均风速均＞10.0 m·s-1；（2）各站月平均风速最大值均出现在1月，A1489、A1490和A1491站风速最小值均出现在11月，A1492站最小值出现在3月；（3）各站日逐小时平均风速呈典型的日变化特征，08:00—16:00风速逐渐增大、16:00—18:00缓慢减小。

关键词: 地面风场, 变化特征, 海坨山, 冬奥会