| China’s rapid urbanization brings not only the rapid growth of urban economic scale,but also urban diseases such as population expansion,traffic congestion,lack of public space,and a series of problems jointly lead to the dissolution of urban vitality.Urban vitality is the vitality of a city and plays an important role in urban development.Urban space provides spatial support and functional services for urban population and their social communication activities,and its built environment has a great impact on urban vitality.Based on environmental behavior,it is of great significance to explore the spatial and temporal distribution of urban vitality and the internal influence mechanism of urban vitality and urban built environment.At the same time,the progress of science and technology,especially the development of big data and the improvement of spatial analysis methods,provide new perspectives and supporting means for the research on urban vitality.This study clarified that urban vitality is represented by the spatial and temporal distribution of urban population,and based on 5D factors,established a quantitative indicator system of urban built environment applicable to this study,and sorted out the specific indicators of potential impact on urban vitality.The spatial analysis method is used to establish the relationship between urban vitality and urban built environment factors,and then the spatial and temporal distribution law of urban vitality and the influence mechanism of urban vitality and urban built environment factors are further studied quantitatively.Taking the downtown area of Wuhan as an example,this study established a theoretical framework to study the spatial and temporal distribution of urban vitality and the internal influence mechanism between urban vitality and urban built environment by summing up the relevant studies on urban vitality.This study clarified that urban vitality is represented by the spatial and temporal distribution of urban population,and based on5 D factors,established a quantitative indicator system of urban built environment applicable to this study,and sorted out the specific indicators of potential impact on urban vitality.The spatial analysis method is used to establish the relationship between urbanvitality and urban built environment factors,and then the spatial and temporal distribution law of urban vitality and the influence mechanism of urban vitality and urban built environment factors are further studied quantitatively.This study analyzed the spatial and temporal distribution of urban vitality in the downtown area of Wuhan,and the global auto-correlation of urban vitality is measured to test the spatial interdependence degree of urban vitality in samples.At the same time,based on the spatial auto-correlation results of urban vitality,the spatial lag model is used to quantitatively analyze the correlation between urban vitality and urban built environment.The results of temporal and spatial distribution of urban vitality show that :(1)The total amount of urban vitality in working days and non-working days is constant(the upper and lower error is 3%).(2)The temporal variation of urban vitality in working days can be divided into three stages: the decline stage,the fluctuation stage and the stable stage;the temporal variation of urban vitality in non-working days can be divided into three stages: the cohesion stage,the fluctuation stage and the stable stage.(3)The spatial variation of urban vitality on weekdays shows a trend of "multi-point aggregation--fluctuation change--continuous fluctuation",while the spatial variation of urban vitality on non-weekdays shows a trend of "aggregation--fluctuation change--continuous fluctuation".(4)The overall center of gravity shift trend of urban vitality is a gradual shift from southeast to northwest.The results of the correlation between urban vitality and urban built environment elements show that:(1)Population density,functional mixing degree,educational and cultural POI density,and street density have a continuous and stable effect on urban vitality(working days and non-working days have the same effect on urban vitality).(2)builting density,plot ratio,proportion of park green space,commercial and financial POI density,commercial and consumer POI density,government and public service POI density,residential area POI density and public toilet density only have an impact on urban vitality in some periods.(3)Water body proportion,administrative office POI density and road density have no correlation with urban vitality.Finally,based on the spatial and temporal distribution of urban vitality and the results of its internal influence mechanism on urban built environment,this paper proposes the strategies of urban built environment planning and design from a macro perspective.Its achievements provide theoretical basis and guidance for improving the planning and design of urban built environment and related norms,thus promoting the construction of urban built environment and promoting the promotion of urban vitality. |
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