Study On The Influence Of Tree Morphology Indicators On Outdoor Thermal Environment In High-altitude Climate

With the continuous development of society and economy,more people are willing to participate in outdoor activities,the activity space under the tree is a place for people to shade and activity in the summer,and a good hot environment under the tree can improve the quality of life of people’s outdoor activities.Reasonable tree morphological index design can improve the comfort of the hot environment under the tree.For cities in high-altitude areas,the impact of tree morphological indicators on the thermal environment is still relatively lacking,combined with the characteristics of tree species in cities at high altitudes,studying its influence relationship with the thermal environment can optimize the microclimate environment of the space around the trees and improve the outdoor comfort of local residents.Based on this,this article contains the following five sections:The first and second parts are the study of related theories.After understanding the relevant research on the effect of green trees on the thermal environment at home and abroad,the tree morphological index and thermal comfort evaluation are introduced,the influence mechanism of the tree morphological index on microclimate is analyzed,and the research object is determined according to the survey.The third part is the actual measurement study.According to the data obtained by the Lhasa Garden and Forestry Bureau,the planting of commonly used green trees in the local area is counted,and suitable research plants are determined.The selected tree morphological indicators are obtained by measurement,and the measured data are statistically analyzed after on-site measurement to determine the physical morphological indicators of trees that have a significant impact on microclimate parameters and thermal comfort evaluation at high altitudes.The fourth part is the simulation study.According to the significantly influential tree morphological indicators determined in Chapter 3,the univariate simulation study was carried out by the control variable method to determine the influence relationship and degree of influence of different tree physical morphology indicators on microclimate and thermal comfort evaluation.Finally,on the basis of the previous research,the fifth part uses the orthogonal experimental design method to explore the interaction between different tree physical morphological indexes on thermal comfort evaluation,and summarizes and proposes the optimization strategy of tree morphology indicators under the background of high altitude climate.