Estimation and analysis of aerodynamic parameters for a typical large city

It is an obvious problem that few studies are conducted despite accelerated urbanization process and increased land-atmosphere interaction in typical mega - cities of China. Different methods for calculating aerodynamic parameters are evaluated for a site with tall buildings (> 39.5 m mean height) in Xujiahui, Shanghai. Meteorological observations and morphometric data were both used in this study,with the former analyzed for the period from December 2012 to November 2013,and later collected for an area with a 500 m radius centered on the Xujiahui tower. The results show that zero-plane displacement (z_d) calculated by the temperature variance method (TVM) has a different variation in various wind directions from building height,but has a similar trend from 58 ° to 208 ° to the plane area index (R2 =0.73). The TVM method is sensitive to empirical parameters, stability range, and wind speed. The standard of wind speed method (Su) and eddy correlation stress method(Es) have similar variations of roughness length for momentum (z_0) with wind direction,and are inversely proportional to z_d input. There are obvious differences both in values and spatial patterns between the aerodynamic and morphometric methods. The source area of measurements and the study site of morphometric methods have obvious impact on estimation and analysis