| Accessibility refers to a certain degree of external linkages and convenient, it is an indicator reflects the cost of a basic traffic. City accessibility is a comprehensive concept, which is determined by the spatial location in the regional transportation system. In recent decades, the rapid growth of expressway is droved by the steady advancement of China's economy. The rapid growth of expressway has brought profound influence to the city location. Therefore, it is very important and meaningful to analysis the city accessibility of expressway network.Based on the background of expressway network, the main research work of the thesis is aim to the city space position and relation in the road network. At the first, the city location theory and its development are described, and the concept and the connotation of the city location and its conditions are cleared. Secondly, the evaluation standards of city accessibility analysis are induced and summarized. Based on these, the indexes of city accessibility analysis are confirmed. Then the construction processes of each index models are discussed. Economic and population factors are taken consideration into calculation of city accessibility, followed by further discussion of impact of city accessibility to the regional logistics development.The empirical research of the city accessibility analysis model is made, taking 30 main cities of Hunan provinces as studied objects. Selected two time periods data of 1993 and 2007 for data analysis and comparison, an empirical research is carried out about analysis model of urban accessibility whether the expressway existed or not. The research result indicates that the comprehensive location advantage of every main city are enhanced by expressway network in the region, but the accessibility gaps between large city and medium-sized are enlarged at the same time.The above research is an attempt to analysis the main city accessibility under the new traffic background, which hopes to provide certain instructional significance for the city development planning and the logistics system planning in the expressway network construction. |
