The population is growing rapidly in Taiwan, and as a result the geographical area encapsulating the population is decreasing dramatically. This is forcing people to use space more efficiently, and this was reflected by constructing tall, multi-storey buildings. Therefore, it is often common to see a lot of tall buildings in modern and congested cities. However, according to reinforcing of wind, tall buildings are of exceptional height and relatively low mass. These two characteristics have their advantages and disadvantages.
Since Taiwan is located in the subtropical zone, it has northeast monsoon in the winter and typhoons in the summer, so people have to be extremely considerate when it comes to designing tall buildings in such conditions. It is critically important that they understand the causes and effects of wind power on the buildings’ physical structures. For example, tall constructions are stiffer than low ones; however they suffer more pressure from wind.
The main objective of this research is to discuss the different characteristics of atmospheric boundary layer between Taipei city and Danshui. It also focuses on the comparison between the wind tunnel experiments and field measurement. It includes characteristics of atmospheric boundary layer, wind profile, turbulence intensity, turbulence length scale, turbulence spectrum, gust factor, and coherence function.
According to the experiment result, it shows that the average intensity of wind velocity have some effects on the wind profile figure under a strong wind circumstance; the turbulence intensity decrease steadily when there is an increase on the average intensity of wind velocity. On the other hand, the turbulence length scale expands while the average intensity of wind velocity increases. The Von-Karman spectrum density function represent the recommended figure of local’s normal wind characteristics. Different level of height of Coherence Function satisfied Davenport’s recommended figure. Under the accurate reduced scale conditions, both the Practical situation model and wind tunnel investigation have similar outcome after comparing the result of the Characteristics of wind field and Field measurement.