Research On Evaluating The Development Degree And Dividing The Spatial Region Of Urban Agglomeration Based On Freight Data

As a core area with the most vitality and potential in the economic development pattern,urban agglomeration plays an important role in advancing urbanization process and improving the overall economic level.Reasonably evaluating the comprehensive development degree and scientifically dividing the boundaries of urban agglomeration can discover problems of the urban agglomeration,which can provide important theoretical support for scientific and rational planning and guidance of urban agglomeration development.However,the current research on urban agglomeration of China is still in its infancy and have been not formed unified evaluation and definition criteria.There is especially lack of studies from the essential characteristics of urban agglomeration development and using actual interactive data to evaluate and define urban agglomerations nationwide.Therefore,this paper will use actual interaction data to comprehensively evaluate from multiple angles and proposes a new method for dividing the boundaries of urban agglomerations.The main work is as follows:Firstly,selecting highway freight data as the basic data of this paper after comparatively analyzing aviation,railway,highway passenger and road freight data.Compared with other data,highway freight is not only the main portion of freight transportation,but its distribution characteristics of inter-city medium and short-distance transportation are very similar to the spatial characteristics of the close distribution of cities in the urban agglomeration.In addition,the freight interaction data can better reflect the economic interaction strength and economic strength between cities in the urban agglomeration,which is suitable for the research of the development degree evaluation and boundary division of the urban agglomeration.Secondly,while selecting the overall development level index used by most researchers in evaluating the development degree of urban agglomerations,two new evaluation indexes of internal development balance and internal interaction relative intensity are proposed.An evaluation index method for evaluating the comprehensive development degree of urban agglomerations is proposed from the three perspectives.Then the CRITIC method is used to weight the three indexes and obtains the evaluation value of the comprehensive development degree of each urban agglomeration.Further,in order to more clearly understand the differences and common characteristics in the development of urban agglomerations,the hierarchical agglomerative clustering method is used to divide the14 urban agglomerations into three stages.The existing problems of the typical urban agglomerations at each stage are analyzed concretely,and advice are proposed for the future scientific and reasonable development of the urban agglomerations.Finally,proposing a method for dividing the boundaries of urban agglomerations from the core cities based on the interaction strength between cities.This paper evaluates the comprehensive development level of all prefecture-level cities in China based on the six criteria layers of economy,population,and transportation and so on.Then combining with the basic spatial region of "two-hour commuting circle" of the urban agglomeration,obtaining the core cities and their research region of 14 urban agglomerations studied in this paper.After that,a city interaction intensity model and the basic requirements of the urban agglomeration are proposed to divide the boundaries of urban agglomerations.Then taking the Pearl River Delta urban agglomeration and the Middle Yangtze urban agglomeration as examples to divide the boundaries and give the specific calculation process.Finally,getting the Chinese 12 urban agglomerations and their spatial region.