| In recent decades,China’s urbanization rate has increased rapidly.Due to the rising urbanization rate and the increasing population density in the city,the outdoor environment in the city has gradually become the main place for people to live.However,due to the increase of urban population,the anthropogenic heat emission is increasing day by day.In addition,the human demand for urban land is increasing,and the natural vegetation is encroached and destroyed by human,so the problem of urban thermal environment is becoming more and more serious.At present,the research focuses more on the impact of green layout and density on the outdoor thermal environment,but less on the impact of different vegetation types on the outdoor thermal environment,and less on the local climate zoning in Chongqing.Therefore,this paper discusses the impact of vegetation types on the outdoor thermal environment of residential areas in Chongqing by combining field measurement and software simulation.First,according to the local climate zones(LCZs)scheme,the various residential communities in Huxi Street,Chongqing were classified,three areas belonging to different local climate zones were selected as the research areas,and the on-site measurement plan was designated,and in July 2020,the three research areas were measured on the spot,and the regional thermal environment air temperature,air relative humidity,black bulb temperature,wind speed,underlying surface temperature and other parameters were obtained,and the trend and law of the thermal environment change were studied.Secondly,Envi-met software is selected as the simulation tool of residential outdoor thermal environment,and the actual spatial models of the three selected research areas are constructed.The accuracy of the model is verified by using the actual test data as the input parameters of the model boundary conditions.Finally,based on the original regional model and scenario design,the arbor and shrub species in the original model were replaced,and the optimization scenarios were calculated by Envi-met simulation software.The air temperature,air relative humidity,wind speed and set values in each design scenario were compared and analyzed by simulation results,and the outdoor thermal environment of Chongqing was proposed Optimize the design scheme.Through the above research,this paper summarizes the research status of residential outdoor thermal environment at home and abroad,classifies the residential areas in Chongqing,grasps the influence law of different vegetation types on residential outdoor thermal environment,explores the improvement effect of plants with different leaf area index on residential outdoor thermal environment,and puts forward the optimization strategy of residential greening plant selection,so as to provide reference for residential areas in Chongqing It provides theoretical support for the selection and transformation of greening plants. |
