| 英文摘要 |
In recent years dramatic change in our climate has focused attention on environmental protection. Various scholars have made significant findings regarding the cause of climate change, in 1833 Luke Howard was the first to study the assumption that the temperature in the city is higher than that of its suburbs. There are many factors that impact the climate within an urban area, including the high density of architecture, the ratio of green space within the city, the level of air pollution and so on. This study focuses on horticultural structure (including porosity, layout, the type, the canopy and height of trees), the relative layout between flora and buildings and its impact on environment. The research method uses actual measurements to feedback and amends the Computational Fluid Dynamics (CFD) setting, then analyzes the various factors. The results of this study show that the vortex and backward flow caused by architecture in the wind field has a complex impact on the aerial change between buildings and vegetation, in which umbrella crowns are the most effective at keeping the wind out; and that the smaller the porosity structure of vegetation the easier it is for backward flow to penetrate, which in turn increases the reduction of wind speed, and therefore is more effective as well. In addition, the ratio between the height of the tree crowns and height of vegetation should be 2/3, to achieve the best wind shield effects. |
