Study On The Characteristics Of Winter Thermal Environment Of Chenggong District In Kunming City

With the acceleration of urbanization in China,the imbalance of thermal environment is also highlighted.It causes frequent extreme weather events and the increasing urban heat island effect,which eventually leads to the decline of the quality of human settlements and threatens human health.This study focuses on the thermal environment management of low-latitude plateau lakeside cities.Based on the experimental test results,the influencing factors of urban thermal environment are analyzed and discussed,aiming to explore the strategies and suggestions of urban construction management in urban thermal environment management.In this study,the temporal and spatial evolution of thermal environment in Kunming City and Chenggong District was preliminarily analyzed by means of fixed point observation,and the temporal variation characteristics of thermal environment in Chenggong District of Kunming from 2012 to 2021 were obtained.Due to the low spatial resolution of meteorological observation station data comparison,the thermal environment parameters in the study area were tested based on the flow observation method.The flow observation test period partition theory was used,and the Surfer software was used to draw the day and night air temperature distribution map of the study area in the winter of 2017,2020 and 2023,and the thermal environment characteristics of the study area were analyzed.On this basis,based on the study of annual changes in land use in local climate zones,the LCZ information management system was used to divide the local climate zones of different surface landscapes in Chenggong District,and the spatial and temporal deduction between local climate zones was analyzed.Corresponding thermal environment change characteristics.Finally,according to the research results,suggestions and countermeasures are put forward to improve the thermal environment in Chenggong district.In view of the above research contents,the following conclusions are drawn:(1)By comparing the thermal environment data of the main urban area and the urban area of Kunming City,it can be found that the temperature change law of Chenggong District is basically the same as that of Kunming City,but the temperature of Chenggong District is generally lower than the average temperature of Kunming City.It can be clearly seen that the heat island center has begun to shift from the main urban area of Kunming City to Chenggong District.(2)The thermal environment of Chenggong University City area has been characterized by multi-center and massive distribution for many years.It is concentrated in high-rise residential areas,business districts,surrounding schools,municipal governments and several densely built urban villages.Near the intersection of the city becomes a high-temperature area in winter,while the low-temperature area is perennially distributed in the area of Huanhu South Road.With the development of urban construction from 2017 to 2020,the high-temperature area has expanded significantly.In 2023,compared with 2017 and 2020,the urban construction affected by the epidemic slowed down,the radius of personnel flow narrowed,the heat emission of human activities decreased,the range of low temperature area increased and the low temperature decreased,resulting in an increase in temperature difference and an increase in heat island intensity.(3)From 2017 to 2021,Chenggong District was in a period of rapid construction.The evolution of urban morphology brought about by its rapid development showed a trend of rapid expansion.The built-up area of Chenggong District grew from multi-point to dense point,and then to contiguous development.While bringing population growth,the built-up landscape type area of urban underlying surface has a trend of point-surface-piece distribution and development.(4)The blue-green ecosystem plays an important role in regulating the urban thermal environment and stabilizing the local climate.The regulation effect is related to wind direction,distance from water body,water perimeter and water shape index.In the urban construction and urban artificial water body planning based on natural water body,combined with the dominant wind direction of the city,the large water body with small perimeter and shape index is laid at the downwind with less occlusion,which can maximize its benefits of regulating the thermal environment.In the area far from the large water body,small and medium-sized water bodies and parks can be planned according to the actual needs as a strategy to optimize the urban thermal environment.