Spatiotemporal Evolution and Zoning Optimization of Road Network Accessibility in Typical Mountainous Villages:A Case Study of Xiushan Tujia and Miao Autonomous County in Chongqing,China
Rural road networks are essential infrastructures in mountainous areas of China.Reasonable planning and construction of rural road networks are of great significance to the sustainable development of rural areas.Previous studies explored rural road network accessibility by a single period with townships as research unit in mountainous areas;however,there were lacks of research on multi-period rural road networks with administrative villages as research unit and settlements as modelling nodes,making it difficult to reveal the spatial-temporal variation of road networks on a village level.In this study,it took Xiushan County in the Wuling Mountains of China as case study to exemplify the spatial-temporal characteristics of rural road network accessibility on a village level.It analyzed rural road network data of 2000,2010,and 2020 using network analysis,SOM clustering,and geographical detector methods,followed by accessibility zoning and optimizing strategies.In the typical mountainous villages of Xiushan County,it promoted the complexity of road network and connectivity,forming a preliminary reticulate transportation network.From 2000 to 2020,the accessibility of the rural road network showed an upward trend,with road network accessibility to be improved on a village level,accompanied by a general increase in the accessibility levels of rural road networks in the county.There was a large spatial difference in the level of road network accessibility in the county,which was jointly influenced by natural and human factors.Slope,elevation,population density,natural disaster sites,and economic development level were positively correlated with accessibility,with a decreasing order:slope＞natural hazard points＞economic development level＞elevation＞population density.The optimized accessibility for the county could be divided into four types:low accessibility area,lower accessibility area,higher accessibility area,and lowest accessibility area.It could be suggested that for effective enhancement of road network accessibility in typical mountainous regions,optimization strategies should be based on the accessibility levels of different zones combined with natural and social conditions.This research provides a scientific reference to the development and construction of road networks and rural revitalization planning in similar mountainous areas.
rural road networkaccessibilityspatiotemporal evolutionpartition optimizationtypical mountainous area
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