Study On Plant Landscape Design Mode Of Dense Roof Green Space Based On Thermal Comfort Theory

With the rapid development of China’s economy and society,the rapid expansion of the city,there is a series of urban problems.Among them,the shortage of public green space caused by land shortage is one of the problems.Roof greening can add green to the hard roof,increase the urban green area and public leisure space,save land,and provide an effective means to solve the shortage of urban land use.At the same time,as an ecological stepping stone,roof greening can improve the overall synergy of the whole urban green space system to a certain extent;in terms of aesthetic value and cultural value,various types of landscape space with roof greening space as the carrier can not only create a pleasant green space,but also provide a place for all kinds of cultural life of urban residents.As a place for urban residents’ daily leisure activities,roof greening is closely related to the thermal comfort of the environment and the quality of life of residents.As an important part of roof green space,plants affect the thermal environment of the roof.In order to improve the roof thermal environment,explore the relationship between plant landscape design elements and thermal comfort,put forward the plant landscape design strategy of roof green space based on thermal comfort,and provide design reference and guidance for enhancing the environmental quality of intensive roof green space.First of all,through the field measurement and questionnaire survey,we can understand the overall situation of the thermal environment of the intensive roof green space in Chengdu.Through the comparative analysis of the impact of plant elements on the thermal environment,according to the user’s questionnaire feedback,we can understand the user’s thermal comfort needs,and establish the evaluation index of human thermal comfort suitable for the roof green space in Chengdu,so as to provide guidance for the follow-up strategies For reference.Then,it quantifies the influence of plant landscape design elements on four different types of landscape space in different periods.Taking envi met as the simulation test tool,using the orthogonal experimental design method and the thermal comfort index pet as the test index,the group simulation test was carried out for different types of space.The concept of contribution rate in orthogonal experimental analysis was introduced to quantitatively analyze the effects of different plant landscape design elements on the thermal environment of four types of space,namely open space,enclosed space,semi open and semi enclosed space and covered space Sound level.Thirdly,taking the outdoor thermal comfort of human body as the evaluation standard and screening basis,the optimization scheme of plant configuration in landscape space under the common influence of various plant landscape elements is determined,and the plant landscape element configuration model suitable for roof greening space is established.From the perspective of thermal comfort,this paper refines the optimization method of plant landscape design in roof green space,enhances the operability of plant landscape design in roof green space,and summarizes the strategies of plant landscape design in roof green space.Finally,taking the roof green space children’s activity area of xichentian street in Longhu,Chengdu as an example,this paper designs the space transformation according to the optimization design strategy,and uses the Microclimate Simulation software ENVI met to simulate the scheme before and after the transformation to verify the practicability of the research results.