棋盘洲长江公路大桥桥位区短期考察风特征分析

Analysis on the characteristics of the wind at the Qipanzhou Yangtse River bridge based on a short-term investigation

鄂东棋盘洲长江大桥具有跨度大,结构轻柔的特点,其设计施工对大风极为敏感,为此专门在大桥处拟建一个自动观测站,根据1年完整(2011年2月～2012年1月)的风观测资料及同期气象站资料,对桥位处平均风速、最大风速、极大风速、风向进行了详细的分析,并与黄石站对应要素进行对比分析,结果表明:1)大部分时间,棋盘洲站的逐月平均风速、月最大风速、月极大风速都较黄石大;2)随着风速增大,桥位处与黄石站逐日最大风速的相关性逐渐下降直至不相关;3)桥位棋盘洲站与黄石站主导风向有一定差异,棋盘洲站主导风向为SSE和NW,较为集中,黄石站主导风向为E和NW风,较为分散.

Qipanzhou Yangtse River Bridge is of long span,light and soft structure.Its design and construction are extremely sensitive to strong wind.Therefore,an automatic observation station,Qipanzhou automatic weather station,is established near the bridge to observe the characteristics of the wind at the bridge.On the basis of the wind data observed at Qipanzhou weather station and data collected from Huangshi whether station from Feb.2011 to Jan.2012,the mean wind speed,extreme wind speed,extreme wind speed are analyzed in details in this paper.The results indicate： 1） most of the time,the monthly average wind speed,maximum wind speed and extreme wind speed at Qipanzhou weather station are larger than Huangshi weather station;2） As the wind speed increases,the correlation between the daily maximum wind speed at bridge and Huangshi weather station decline gradually until irrelevant;3） the predominate wind directions at Qipanzhou weather station are converging SSE and NW,in some degree different from those at Huangshi weather station,which are E and NW and non-converging.