Research On Landscape Design Strategy Of Overhead Space Surroundings In Lingnan University Based On Thermal Comfort In Summer

At present,urban heat island(UHI)effect is becoming increasingly serious and extreme high temperature occurs frequently.As a common grey space on campus in Lingnan region,overhead space not only has good climate adaptability,but also carries rich functions.Under the background of reducing energy and carbon,how to further exert its application value has attracted increasing attention from researchers.This paper takes the first floor overhead space of Lingnan High School as the main research object to discuss the influence of landscape elements around in the overhead space on thermal comfort,then selects typical space through current investigation and spatial analysis.Based on the measurement of typical overhead space and the simulation research on the single landscape element scenario,including tree layout in the courtyard and peripheral,tree LAI in the courtyard and peripheral,and underlying surface material in the courtyard,the changes of various climate factors are discussed.Then Box-Behnken Design(BBD)experiment was used to conduct multi-factor combination analysis,and a first-order regression model of physiological equivalent temperature average value PETm in 1.5m high was established in the overhead space to analyze the influence weights of different landscape elements on each overhead space.Based on the results of single factor simulation and multi-factor regression model,the design strategy of landscape elements around was proposed and verified.This paper focuses on the following studies:(1)Carry out field investigation and spatial analysis on the current situation of overhead space in Lingnan universities,and summarize the layout form of university teaching buildings and the its use status,spatial functions and main forms of overhead space on the first floor.The teaching building of enclosed courtyard is taken as the main category,and on the basis of which the courtyard size,storey height,overhead rate and other building parameters are extracted as the basis for the selection of research objects,and the typical overhead space on the first floor is determined as the research object.(Chapter 2)(2)Taking the corrected physiological equivalent temperature PET in Guangzhou as the evaluation index,the field measurement study of the overhead space in universities was conducted to discussthe influences of different orientations and environment of the overhead space on various climatic factors were discussed.The ENVI-met model was used to simulate the actual overhead space.Through the correlation analysis between the simulation and the measured data,The feasibility of ENVI-met model in the comparative study of overhead(semi-outdoor)space is verified.(Chapter 3)(3)Quantitative simulation research was carried out on single landscape elements of tree layout in courtyard and peripheral,tree LAI in courtyard and peripheral,and underlying surface material in courtyard.The results showed that different landscape elements had different influences on various climatic factors and thermal comfort in different first floor overhead space.(Chapter 4)(4)The Box-Behnken Design(BBD)test of Response Surface Methodology(RMS)was used to build a first-order regression model of tree layout and LAI of four elements of courtyards and peripheral on overhead space to explore the influence weights of different landscape elements around the overhead space,and to propose landscape design strategy of overhead space surroundings in Lingnan university based on thermal comfort in summer combined with the research results of a single element,which mainly include: Different functions can be given to the overhead space in different directions.In the design around the overhead space,the primary factor should be the LAI value of trees,followed by the trees layout.According to the different prescription positions of the overhead space,the surrounding tree configurations are different.The improvement of thermal comfort of the northern overhead space should pay more attention to trees LAI in the south courtyard,and the improvement of thermal comfort of the middle and southern overhead space should pay more attention to LAI of the surrounding trees.The underlying surface of the courtyard should avoid materials with high reflectivity.Grass material should be used as much as possible,and the layout of water should be considered without affecting the site function.High LAI trees should be used as far as possible to reduce the influence of hard underlying surface on overhead space without affecting the activity site when hard underlying surface must be used.Finally,on the basis of the proposed strategy,the practical simulation application is carried out,and two conditions of the status quo and optimization are constructed.The feasibility of the strategy is verified by the simulation.(Chapter 5)In this paper,the landscape element configuration around the first floor overhead space of Lingnan University was studied.Based on the research results,suggestions on the use of different positions of overhead space and surrounding landscape design strategies were put forward and the design simulation application was carried out,providing a preliminary reference in terms of thermal comfort for the environment construction of the first floor overhead space of Lingnan University.