天津塔层风切变的研究

根据天津气象铁塔１９９０－１９９２年冬季８个月的风速、风向、温度等资料的分析，得到了天津２５０ｍ以下边界层中风切变的若干特征，如风垂直分布幂次律中指数ｐ的时空变化及频数分布，各层各时段风切变的频数分布，风切变与温度梯度、稳定度的关系。这些特征有助于对城市下垫面塔层中风垂直分布的了解。还分析了冷锋过境前后风切变及温度状 的分布情况。

A Study of Wind Shear in Tower Layer over Tianjin

ased on the data analysis of the wind speed,wind direction and temperature observedon Tianjin tower during 8 months in the winter season of 1990-1992, the characteristics ofwind shear in the boundary layer below 250m in Tianjin are given,such as the temporal andspatial variations of the index pin the power law of the wind profile,the frequency distribution of the wind shear in different layers and different time intervals,the relation between thewind shear and stability. The vertical distribution of wind in the tower layer over the city ispresented. The variations of the wind shear and temperature during the passage of cold frontare also analysed.