| The spatial structure of urban agglomeration is the skeleton of its development and evolution,which is related to the close cooperation and efficient operation of the inner cities,and is the key to the healthy and resilient development of urban agglomeration.In the past,most of the researches started with the linear prediction of the current urban scale structure,and then got the scale structure and urban system of the planning through the series of major infrastructure,but ignored the relationship between the cities and the role.With the continuous development and maturity of urban agglomerations,the interconnections and functions among cities play an increasingly significant role in shaping the spatial structure of urban agglomerations,and their externalization is manifested in the flow of various factors such as urban residents,products,and information in the space,therefore,the focus on the spatial structure of urban agglomeration is changing from single,static point-axis linear relationship to multi-dimensional,dynamic urban interconnection network.The Shandong Peninsula urban agglomeration is still in the early stage of development,which is different from the highly developed areas of Pearl River Delta and Yangtze River Delta,as well as the unit structure of the ocean,peninsula,Yellow River Delta and southern Shandong.It is necessary to strengthen the research on the interrelation and function of urban agglomerations,clarify the direction and intensity of the main interrelation of cities,and look for the densely distributed and closely connected areas as the important space carrier for the development of urban agglomerations,thus for the urban agglomerations spatial structure to provide more scientific and reasonable optimization strategy and theoretical support.In this study,firstly,we choose the transportation connection as the angle of view to study the interaction and effect between cities,improve the classical gravity model,and introduce the traffic flow to supplement the model factor,the time distance factor is used to replace the space distance factor.At the same time,the big data collection method was used to obtain the traffic data of railway and highway between 16 prefecture-level cities and 91 county-level cities in the Shandong Peninsula urban agglomeration,the intercity freight connection and passenger transport connection are two aspects to explore the intercity connection measurement.Secondly,through the improved measurement model to reveal the inner relationship between cities in urban agglomerations,and the status of the network characteristics and core issues of qualitative and quantitative evaluation.To reconstruct the sub-unit structure of urban agglomerations with different connection strength,and to construct the metropolitan area according to the dense and strong connection network,and to construct the urban dense area according to the secondary network,according to the result of connection center measure,the structure system of cities at all levels is optimized and the correct development direction of cities at all levels is guided.At the same time,according to the result of optimization,the connection network is constructed to guide the important infrastructure layout to match the main connection cluster and put the regional traffic facilities in a targeted way.Finally,the paper puts forward the strategies and planning measures for optimizing the spatial structure of Shandong Peninsula urban agglomeration,which will provide theoretical support for the regional coordinated development and scientific planning of the urban agglomeration. |
