Variation Of Urban Three-dimensional Architecture Landscape And The Simulation Of Wind Environment

With the acceleration of urbanization,urban buildings are expanding in a threedimensional direction.At the same time of 3D architecture landscape evolution,urban wind environment changes constantly,which causes a series of urban environmental problems,such as urban heat island effect,human settlements environment comfort reduction and so on.Therefore,the analysis of the spatial and temporal evolution of urban wind environment in the process of 3D urban development has become a hot topic for urban environmental researchers,which is of great significance to promoting the coordinated development of urbanization and ecological environment.Based on the 3D basic data of buildings in the four years of 2003,2006,2009 and 2012,this paper chooses Shinan and Shibei in Qingdao as the research objects,and constructs six indexes,named average height,density,volume ratio,spatial crowding degree,degree of misplacement and average building shape coefficient.The 3D analysis of the research area and five 500 m *500 m quadrate from 2003 to 2012 is studied by using Arc GIS spatial analysis method.Based on the theory of urban atmospheric environment,Airpak software was used to simulate the wind environment of the quadrat.The spatial and temporal evolution characteristics and rules of the wind environment on the quadrat scale were evaluated by air age,area ratio of strong wind area,area ratio of quiet wind area and proportion of relative comfortable wind speed.The results show that during the period of study,the evolution law of urban 3D architectural landscape is consistent in the whole research area and the scale of the sample.After 2009,the 3D architectural landscape changes obviously.Most of the building types are middle-high and high-rise buildings.The average height and volume ratio of the buildings increase year by year.The building density and shape coefficient decrease year by year,the crowding and staggering degree of the building space fluctuate Change trend.Based on the results of wind environment simulation on the quadrate scale,it is concluded that in 2003-2012,the area ratio of the quiet wind zone at 1.5m height is dominant,the area ratio of the strong wind zone tends to be 0,and the wind environment in the building group is getting better gradually;the area ratio of the strong wind zone at 10 m height is slightly higher than the area ratio of the quiet wind zone,and shows a decreasing trend;the area ratio of the strong wind zone at 30 m height is dominant and decreases year by year,and the area ratio of the quiet wind zone is getting better.The volume ratio and air age increase year by year.Based on the landscape evolution and wind environment simulation on the quadrat scale,it is concluded that the proportion of wind speed in the relative comfort zone increases with the increase of average height,volume ratio and staggered degree,and decreases with the increase of spatial crowding degree.