奥运会赛艇场馆逐时风场特征

Characteristics of Hourly Wind Field over Olympic Rowing-Canoeing Park in Beijing Olympic Games

应用2007年8月北京奥林匹克水上公园12个自动测风仪逐时风场资料、BJ—ANC对流临近预报系统提供的产品和自动气象站资料等，统计分析了8月奥林匹克赛艇场地的逐时风场各级风的出现频率，同时分析了逐时风速特征和风向特点。结果表明：08：00～18：00，O～2m／s风速出现的最大频率为82％，出现在08：00；风速在3～5m／s的最大频率为41％，出现在09：00，次之是15：00频率为36％；风速呈现在6～8m／s的频率迅速降低，最大仅有14％。大于9m／s的风速出现频率更小，这种风速一般与强对流天气相对应。BJ—ANC系统的强度产品弱窄带回波，能够预报风向的转变：当弱窄带回波经过奥林匹克水上公园时，有风向转变和风速变化，若两条弱窄带回波碰撞时，雷暴加强，这对奥运赛艇比赛有指导意义。

Using the wind data at one-hour interval of 12 CAWS600 sets and the data of BJ-ANC and AWS, the occurrence frequencies of various level winds over the Olympic Rowing-Canoeing Park in August 2007 are statistically analyzed. Meanwhile, the features of wind speeds and directions are also analyzed. The results show that from 08：00 to 18：00 （Beijing Time）, the frequency of wind speed being 0 to 2 m/s accounts for 82% with the maximum at 08：00, and that being 3 to 5 m/s accounts for 41% at 09：00, then 6 to 8 m/s accounts for only 14% at 15：00, that of more than 9 m/s is very small, which are related to strong convective weather. The analysis shows that the weak and narrow echo bands in BJ-ANC reflectivity products can be,used to predict wind direction variation. When a weak and narrow echo band moves through the Olympic Rowing-Canoeing Park, there will variation in wind speed and direction; when two weak and narrow echo bands run into each other, the storm will intensify, which is of significance to the meteorological support of Olympic rowing races.