上海城市近地面层风场特征的初步研究

城郊下垫面结构的不同,造成了城郊风场上的差异,本文探讨了上海城市对近地面风场的影响。研究表明:城市通过其下垫面之摩擦作用明显地降低了市区的风速,并使得市区小风频率显著增加。城市的这一作用还引起城郊近地层风场结构的差异,在数百米内城区风速均小于郊区风速。上海市近地面层风速的连续分布可用退化的二参数Weibull分布精确地描述。

Study on Some Features of the Wind Field in Shanghai City

Some differences of wind field between the city proper and the suburbs of Shanghai are discussed in this paper. The author finds that the wind speed in the city proper is less than that of the suburbs because of the urban ground friction. As a result, the frequency of breeze in city proper increases. Futher stucy shows that the difference of the wind speed exists in a layer of several hundred meters above the ground. The successive distribution of the wind speed in this layer can be precisely discribed by weibull function of two parameters.