Study On Spatial Morphology Of Pedestrian Street Based On Urban Microclimate In Lhasa

Pedestrian street is an important part of urban space,in people’s daily life occupies an important position.Walking is the main mode of travel of Lhasa citizens,and the pedestrian streets in Lhasa are both daily activities such as entertainment,quotation and rotation.This poses great demands and challenges for the space environment of the pedestrian streets.Under the extreme climatic conditions of Lhasa summer and winter,studying the relationship between space shape and microclimate of pedestrian street and adjusting relevant influence factors through active design means is helpful to improve bad microclimate environment and improve the use of The comfortable feeling of those who are interested in the overall energy saving of the streets and neighborhoods is also of great significance.There are six parts in this thesis.The first and the second chapters are basic research.First of all,through the background research and literature review,we can understand the research achievements and deficiencies in the relevant fields both at home and abroad.Secondly,based on the research results of the predecessors,we introduce the composition of the form factors of the valley and the research results that have influence on the microclimate.Introduced the components of the microclimate,from the natural and artificial aspects as well as the street energy balance equation from different angles to understand the impact of microclimate elements and interactions;then introduced the unique climate of Lhasa and through The summary of evaluation methods has determined the microclimate evaluation criteria in this paper,which provides the theoretical basis for the research and analysis in the third and the fourth chapters.The third chapter is the investigation and analysis of the current situation.Firstly,the author generalizes the morphological characteristics of the pedestrian street in Lhasa through the extensive research on the pedestrian street in Lhasa,and selects representative measured objects.Then,Of the measured data were summarized,and the use of control variables to analyze the different morphological factors,the morphological factors on the impact of street microclimate preliminary judgment;The fourth chapter is the computer simulation and the determination of the influential factors.The first part is to model the measured area,compare the coupling between the measured and the simulation results,and judge whether the software is suitable for this research.The second part is about the street shape factors: aspect ratio,direction,square,Building altitude combination mode,sub-east-west and north-south directions,inputting winter and summer meteorological parameters of Lhasa to simulate the street microclimate environmental characteristics formed by different morphological factors,which provide the basis for the following optimization strategy;The fifth chapter is the strategy,first of all,review the context of the whole research.Based on the above research results,from the perspective of adapting to the special climate and environment in Lhasa,we put forward reasonable and scientific suggestions for optimization.The sixth chapter is the conclusion and prospect,summarizes the achievements and deficiencies of this study,and puts forward the prospect of related research in the future.