Coupling Study The Wind Environment And Urban Spatial Morphology In Urban Central Area

With the gradual deepening of the process of urbanization and the rising level of economic development level, China’s cities are experiencing a period of fast development with Spatial scales rapidly expanding and building capacity sharp increasing. Although to some extent, intense urbanization improve the living standards, But also increase the burden on the environment. Urban wind environment, as an important part of urban micro-climate, plays an important role on all the diffusion of air pollutants, heat island effect digestion, comfortable outdoor environment,human health and safety and EEB, it has become the focus of multidisciplinary research. City center, as the city’s core area,has a more prominent mpact on urban wind environment,so improving the urban wind environment from the perspective of urban planning is particularly urgent, in the macro background of careting a livable urban living environment.This paper studies the assessment methods and numerical simulation of wind environment in the city center,and the relationship between wind environment and urban spatial morphology,provides technical reference methods and improve strategies for optimizing the city center wind environment.Firstly, establish numerical simulation technology and methods for large-scale urban wind environment, based on the methods and processes of wind numerical modeling simulation. Secondly, integration of existing relevant policy standards and evaluation method of the outdoor wind environment assessment to construct the assessment strategies of urban central wind environmrnt, among them, the overall level strategys including wind speed numerical evaluation criteria, the neighborhood-level strategies including five evaluation index,average wind speed, wind speed comfort ratio, dispersion degree of wind speed, calm wind area ratio and strong wind area ratio. Combined with the sample case Nanjing Xinjiekou center, analysis and evaluation the basic situation and characteristics of its summer and winter wind environment at the height of the pedestrian.Then,explore the relationship between wind environment and urban spatial morphology,from two perspectives,urban spation morphology index and urban spation morphology unit. By quantifying spatial shape index and wind environmental parameters, statistical analysis various planning index factor’s in influence on the average wind speed ratio of pedestrian height. Further, based on thirtheen categories of typical spation morphology unit in the region of urban central area,compare the difference between wind environment of different types of spation morphology unit,the analysis their characteristics and the causes of the problem.Finally, Induction and organize the factors of urban spatial morphology to the wind environment,and summary the optimization of urban wind environment,from three aspects ofurban planning, architecture and landscape.