Research On The Road Network Structure And Spatial Perception Of Wuxi City Center Based On Space Syntax

In recent years,with the rapid increase in the level of urbanization in China and the expansion of urban scale,the urban road network is being updated,constantly,as the skeleton and support of urban space,the evolution of the urban road network structure is crucial to the development of the city.In 2014,China introduced a new urbanization development strategy,the "new" means people-oriented.Under such a circumstance,it is a worthy of study question that the impact of road network extension on residents'perception.Many scholars research on perception mostly from the static level,and there are relatively few studies on dynamic perceptual changes.According to the characteristics of time evolution of road network structure,exploring the dynamic change process of spatial perception in.the process of urbanization is a valuable research issue.This paper takes Wuxi's central city as an example.Based on the spatial syntax theory,it establishes an axis graph model for empirical analysis.Using Spatial Syntax Quantitative Analysis method,combined with double logarithmic linear regression model and GIS spatial analysis technology,studying the evolution characteristics of the road network topology,spatial perception and accessibility structure in the Wuxi central area at different times.It is also Explore the matching relationship between road network accessibility and perception in spatial distribution,the conclusions as follows:At the point of topological connection structure,from 1980 to 2005,the connection value showed a graded step gap,there is a clear step-like structure.The grading structure of main,secondary road and Branch road is irrational.The ever-smaller gap between "ladders" reflects the grade structure of the road network in the region is continuously optimized.Each local variable obeys the negative power law distribution,and there is obvious area without scale.On the one hand,the scale-free area shows that there is a certain degree of randomness and disorder in the distribution of road networks.It can also explain the agglomeration of urban core areas and the inertia of road network evolution.In terms of accessibility structure,accessibility is characterized by the index of integration,global integration degree can represent the road accessibility in the overall research system and local integration degree represents the accessibility of the road in the local space.The integrated core is the dominant path in the system.The integrated nuclear space location is very stable,in Wuxi's central city and there is a trend of gradual expansion from the core area.It shows that the urban-rural ties are continuously strengthening.In terms of global accessibility,the distribution network of high-accessibility road network is characterized by network and complexity in Wuxi's central city.The structure of highly accessible road networks is gradually perfecting and its scale is expanding.Road network structure with high reachability appears"Multi-axis-single core-One core single axis-a core two spindles" evolution process.In terms of local accessibility,the road network with higher reachability has been continuously expanded and it has become networked.However,it has no obvious spatial structure.From the perspective of spatial perception,the intelligence of Wuxi city center is in the middle level in each year.According to the observation of road connectivity in the local range to get the overall spatial information is moderate.Its spatial perception capacity decreased first and then increased.The overall change rate was smaller from 1980 to 2015.In spatial perception of regional level,the difference of spatial perception ability is obvious.At the grid scale,the spatial perception structure has a "core-edge"-"lower north than south"-the evolution of "dual differentiation".There is a dislocation relationship between spatial perception and road network accessibility structure.Based on the results,the following suggestions for urban development can be provided:in the ordinary city,the old city area is often affected by the "inertia" effect.In urban planning,it is necessary to coordinate the layout of the road network and the subject perception.The original urban pattern should be followed in transformation of the old city.Avoid artificial change to make a big cost.The results can help to improve urban planning policies and enhance the practical guidance of planning.