Wind Environment Optimization Study On The Planning And Design Strategy Of Enshi Urban Overall Spatial Form

With the acceleration of urbanization and urbanization construction,the urban ventilation environment is deteriorating day by day,the wind speed is obviously weakened when the wind come through suburbs to the urban area.The phenomenon of urban calm wind is increasing,area of heat island effect is increasing.Especially the problem of air pollution in calm wind and high density cities is more prominent.Which seriously affects people's health and life.The construction of urban air ducts is imminent.At present,a large number of studies on urban wind environment and wind channel planning focus on the analysis and evaluation of wind environment of single buildings or buildings with small occupied area and simple layout,while relatively few studies and analysis are conducted on regional and urban wind environment.This paper firstly combs the research of scholars in the field of wind environment at home and abroad,and summarizes the current research results of wind environment at home and abroad from the regional-urban scale level.Secondly,on the basis of combing the local circulation theory and application methods,a combination of quantitative analysis and qualitative analysis is proposed from the perspective of urban wind tunnel planning.Specifically,after comparing and analyzing various kinds of fluid dynamics numerical simulation software,the suitable method of Enshi is determined,and then the action space,compensation space and air guide channel are determined according to the calculation results.Finally,taking Enshi,a calm wind city in the basin as an example,in view of the current situation of urban air pollution,combined with wind field simulation and ventilation channel planning,the correlation between urban morphology and local climate was studied.The wind environment of Enshi natural state,the wind environment of the master plan and the wind environment of this urban design scheme are compared and analyzed.And the mode of the basin calm wind urban spatial form under the local circulation is summarized.Suggestions are given on the spatial optimization strategy of overall urban design.