Study On Development Planning Of Core City's External Traffic In City Group

As an advanced form that incarnates the urbanization level, city group has gotten extensive attention in China. The core city among city group is the carrier and core unit which impulses the development of regional and urban economics. The external traffic of the core city is a tie that connects the regions inside and outside of the city group. And the planning and development of external traffic in the core city play an important effect on the society and economy development of the city group. The paper focuses on the entire planning and development of external traffic in city group as a precondition of external transportation channel planning of the core city. Compared with the traditional single traffic methods and separate planning modes, the external traffic planning of the core city is analyzed on considering both sustainable development of comprehensive transportation and overall development of the city group.The main contents are listed as follow:(1) The paper analyzes the relationship between external traffic of core city and the development of the city group, and defines the bound of the core city. It is concluded that the external traffic of the core city has a feature of hierarchy by means of comparing external traffic of general city with that of core city. The external traffic of core city is divided into three levels, which are discussed in detail. And then, the influence factors of external traffic in core city are divided into two parts, internal factor and external factor, which are the base of the establishment of external traffic development strategy of core city in city group.(2) It introduces SWOT analysis method, which is proved to be as a feasible and rational method to establish the external traffic development strategy of the core city. Moreover, the SWOT is used to analyze and establish the external traffic development strategy of Chengdu in Cheng-Yu city group.(3) It forecast the urban external traffic using grey correlation-regression method. To ensure the accuracy, the paper checks the result with passenger capacity producing mechanical model. And the error is in the accepted range. With the help of the correlation coefficient method and elastic coefficient method, the freight producing demand and pass-through freight demand of core city are forecasted. (4) According to the development strategy of core city established above, the paper defines the external traffic development requirement and evaluates the existing external traffic planning of the local region and wide region. In the example, the external traffic planning of Chengdu basically satisfies the development needs of Cheng-Yu city group. Then it proposes some advices to improve traffic planning in Chengdu. And the time of building a new line has also been discussed.By analyzing and researching the external transportation channel function definition, external traffic demand, system planning and other aspects of core city, the paper builds the basic framework of the external transportation channel planning in the core city within new circumstance. And all of these can be expected as a consultation and supported to achieve the development of external traffic in core city and city group in China.