Study On Thermal Comfort And Crowd Behavior Of Urban Pedestrian Street In Severe Cold Area

Outdoor public spaces are an important part of residents’ living environment.Due to the increasing diversity of social life,people have put forward higher requirements for the environment of outdoor public spaces.Therefore,it is also necessary to explore and study outdoor public spaces.Pedestrian streets are the main component of urban outdoor public spaces,not only providing a place for residents’ entertainment and leisure,but also a carrier of urban economic and cultural development.This study focuses on analyzing the thermal comfort and crowd behavior of urban pedestrian streets in severe cold regions,as well as the quantitative relationship between the two.Based on the research results,it provides designers with predictive methods for crowd behavior in urban pedestrian streets and design strategies to enhance the spatial vitality of pedestrian streets.This article adopts comprehensive research methods such as on-site measurement,questionnaire survey,crowd observation,statistical analysis,and numerical simulation to study the thermal comfort and crowd behavior of pedestrian streets in severe cold areas.A systematic analysis was conducted on the effects of physical environment and physiological and psychological factors on thermal comfort.Revealed the patterns and characteristics of crowd behavior changes in pedestrian streets,and conducted in-depth research on the relationship between thermal comfort and crowd behavior.Based on the research results,establish a crowd behavior prediction model and propose a pedestrian street design and renovation plan to improve spatial vitality.Firstly,in terms of research on thermal comfort,methods such as ridge regression analysis and correlation analysis are used to determine the thermal environmental factors that affect thermal comfort in pedestrian streets in severe cold areas,as well as the relationship between physiological and psychological factors such as gender,age,perceived control,and residence time and thermal comfort.By using methods such as linear regression analysis and probability unit regression analysis,thermal comfort thresholds such as the acceptable range of heat,modified Universal Thermal Climate Index(UTCI),neutral temperature,and thermal sensation range were defined.Secondly,in terms of research on crowd behavior,Arc GIS was used for crowd labeling and grid processing to analyze the spatial distribution characteristics of urban pedestrian streets in severe cold regions.Linear regression analysis,non parametric testing,and other methods were used to analyze the changes in the total population flow,number of active individuals,and duration of activity,as well as the demographic composition of the population,including gender and age.Revealed the influencing factors of pedestrian walking speed in pedestrian streets and the relationship between walking paths and street spatial environment.And explored various factors that affect the intensity of crowd activity,standing and seating behavior.Finally,in terms of the relationship between thermal comfort and crowd behavior,combined with ENVI-met’s numerical simulation of the pedestrian street thermal environment,the range of thermal comfort with the highest crowd density was defined.And using linear regression and other methods,the relationship between thermal comfort and the total pedestrian flow,number of activities,activity duration,activity intensity,as well as the path and pace of pedestrians was analyzed.The threshold for thermal comfort and crowd behavior changes under the influence of microclimate was ultimately determined,revealing the corresponding relationship between thermal comfort and crowd behavior.According to the research results,a crowd behavior prediction model based on thermal comfort is established by using multi-layer perceptron(MLP)neural network.Apply models to predict crowd behavior and propose design and renovation plans for pedestrian streets based on the predicted results.This study meets the needs of urban construction and development in severe cold regions of China,and has important reference significance for improving the outdoor public space environment and enhancing spatial vitality in cities.