Abstract:

Road network is the material conditions and prerequisites for forming the metropolitan area network system, and also the main channel of material flow, energy flow and information flow, which plays an important role in the socioeconomic development of metropolitan area. Accessibility is an effectively comprehensive index which can be used for evaluating the developmental level and servo efficacy of road network. Therefore, accessibility study has attracted longterm and sustained enthusiastic participation by many scholars from urban planning and transportation geography, and those who are engaged in regional development. However, the current researches still has many defects in their research methods, perspective, and scale. For example, dividing effects of administrative boundaries and taking equal opportunity for all travel direction as the prerequisite are the two big problems of the current researches on accessibility. For the inadequacies of the traditional accessibility evaluation model based on the shortest path and the narrow research perspectives, this paper reconstructed the accessibility evaluation model and weighted field model based on the shortest transit time, seted up an evaluation index system of township accessibility based on city hinterland, from bottom to top reveals the spacetime patterns and the evolution characteristics of township accessibility with the help of urbanrural road network space database from 2000 to 2011 in Jingzhou: ①Township accessibility evaluation based on city hinterland behaves better in simulating the town’s willingness to travel, and is able to realize the unity of regional accessibility and interregional accessibility. From 2000 to 2011, the optimization of traffic network brings significant time-space compression effect to city hinterland. The spatial pattern of city hinterland based on township areas evolved from “a city (Jingzhou) dominating” to “two cities (Jingzhou and Yueyang) sharing”, and the spatial pattern of county hinterland also experienced a development process from “Jingzhou exclusive” to “peripheral sharing” in the last ten years; ②From 2000 to 2011, the spatial distribution of township accessibility was found to basically follow the distance attenuation law, showing a ring pattern distribution around Jingzhou city, and exhibiting microscopic dynamic and macroscopic stability characteristics in the time sequence: First, the spatial distribution of township accessibility presents a dynamic development trend from a low level of agglomeration to optimal equilibrium. Second, the spatial structure of township accessibility evolves from core periphery to layers. Third, the development of township accessibility has significantly rapid corridors directivity and temporalspatial inertia. ③From 2000 to 2011, the spatial evolution characteristics of township accessibility was found experience a process from “single coreuniaxialweak diffusion” to “single coremulti axisstrong diffusion” to “dual coremultiaxisfull proli”