Study On The Quantitative Evaluation And Intrinsic Correlation Of The Vitality Of Back Street And Alley In Nanjing Old City

After decades of rapid urbanization,China’s urban construction has made remarkable achievements.However,with the continuous expansion of the city scale,a series of urban problems such as disorder of the old city,loss of public attributes of streets,lack of public space and environmental deterioration have arisen.In recent years,China’s urbanization has entered a new historical stage from extensive increment to quality inventory.Creating a livable,comfortable,dynamic and shared urban environment for people is the key objective of urban development today.Under the guidance of humanism,a series of urban restoration work,such as the revitalization of the old city center and the improvement of the urban vulnerable public space environment,is becoming an important part of urban construction.Backstreet alley space is an important living place for residents.Its vitality and environmental quality are important components in urban research.Recently,the renovation of back streets and alleys and old communities in old urban areas have been carried out in an orderly manner.The spread of Coronavirus Disease at the end of 2019 is causing huge losses to the global economy.These urban space renovation projects have become a timely action that takes into account the dual needs of expanding domestic demand and improving residents’ lives.In this context,from the perspective of street vitality evaluation,this paper takes the vitality of back streets and alleys as the research content,selects 40 back streets and alleys in five major districts in the old city of Nanjing as the research cases,evaluates quantitatively the vitality of back streets and alleys in the old city of Nanjing,analyzes its intrinsic correlation and finally puts forward some strategic suggestions for improving the vitality of back streets and alleys.In the theoretical research,this paper first sorts out and summarizes the relevant research results of street vitality and back streets and alleys,clarifies the two connotations of external representation and constituent elements of back streets and alleys,establishes a quantitative evaluation index system of back streets and alleys vitality.In the empirical research,this paper collects pedestrian activity data,map vector data,POI data and other basic research data through the Internet and on-the-spot investigation.Based on this,quantitative evaluation and characteristic analysis are carried out on the vitality of back streets and alleys in the old city of Nanjing.Finally,by using multiple linear regression method and systematic cluster analysis,the environmental quality factors that have significant impact on pedestrian activities are sorted out,the intrinsic correlation of back streets and alleys vitality is analyzed,the vitality mode of back streets and alleys is summarized to put forward the remediation strategy of back streets and alleys.According to the research,pedestrian’s objective activities and subjective satisfaction are the external manifestations of the vitality of back streets and alleys,and the development intensity,location,function,form,facilities and image of environmental quality are the constituent elements of the vitality of back streets and alleys.As far as the intrinsic correlation of the vitality of back streets and alleys is concerned,the environmental quality factors that have a significant impact on pedestrian activities in streets and alleys can be divided into three groups: comprehensive and one-sided,positive and negative,strong and weak.At the level of vitality mode of back streets and alleys,there are four modes according to the performance of pedestrian activities,namely,Ⅰ high density-high fluctuation-high stay-high satisfaction,Ⅱ high density-high-fluctuation-high residence-low satisfaction,Ⅲ low density-low-fluctuation-low stay-high satisfaction,Ⅳ low density-low fluctuation-low stay-low satisfaction.Finally,the paper sums up three levels,four categories and eleven strategies to improve vitality.Specifically,the full text structure is as follows:The first chapter is the introduction which mainly explains the research background and significance of this paper,defines the related concepts such as back street vitality and environmental quality,sorts out and summarizes the related research results at home and abroad on back street vitality,and also introduces the research content and scope,explains the research methods and technical route adopted in this paper.The second chapter is theoretical research which defines the related concepts such as back street vitality and environmental quality,sorts out and summarizes the related research results at home and abroad on back street vitality and back street vitality to clarify the connotation of back street vitality and make theoretical preparations for the following.In the second chapter,for the construction of quantitative system,on the basis of the clarification of the connotation of back street vitality,the evaluation indexes of pedestrian activity and environmental quality in back streets and alleys are screened and the quantitative methods of each index are introduced in detail,the quantitative evaluation index system of back streets and alleys vitality is established.The third,fourth,and fifth chapters are the core empirical research contents of this paper.Taking 40 back streets and alleys in the old city of Nanjing as an example,the third chapter makes quantitative evaluation on various indexes and summarizes and analyzes their spatial characteristics and characteristics before and after renovation.The fourth chapter uses multiple linear regression analysis,through the statistical analysis of quantitative evaluation data,analyzes the intrinsic correlation of back streets and alleys vitality.The fifth chapter uses the system clustering analysis method to classify and discuss the vitality modes of the back streets and alleys,discusses the characteristics and shortcomings of various modes,finally gives the back streets and alleys remediation strategies based on the intrinsic correlation study.The sixth chapter introduces the conclusion,innovation and deficiency of this paper.In general,from the perspective of human and environment,this paper uses quantitative research methods to study the vitality of back streets and alleys,establishes a quantitative evaluation index system for the vitality of back streets and alleys,makes a quantitative evaluation on the vitality status of back streets and alleys in the old city of Nanjing,excavates the environmental factors that have a significant impact and summarizes their impact mechanisms which provides certain theoretical basis and strategic reference for the revitalization of back streets and alleys in the process of urban renewal and repair.