Research On Coordination And Control Of Supply And Demand Of Urban Agglomeration

The urbanization accelerated as a result of the development of industrialization,urban agglomerations have gradually become the main carrier of national economic development and social progress.Traffic,as the "context" of urban agglomerations,plays a crucial role in the exchange of material flows,people flows,and information flows between cities within urban agglomerations and between urban agglomerations and external regions,therefore,it can be said that transportation is the foundation of urban agglomeration’s economic construction and development.However,due to a series of reasons such as the incoordination of the traffic planning and the development speed of urban agglomeration,the contradiction between the supply and demand of the urban agglomeration becomes increasingly serious,and various problems brought by the traffic have become the main factors affecting people’s quality of life.Therefore,accelerating research on urban agglomeration traffic planning and proposing reasonable planning suggestions are the key to promoting the healthy and sustainable development of urban agglomerations.Based on this background,on the basis of summarizing existing studies,this paper analyzes various factors that affect the contradiction between supply and demand of urban agglomerations,selects the main factors,and uses the basic principles of system dynamics to establish a causality diagram for the supply and demand of urban passenger and freight transport.and analyzed the main cause and effect feedback loop.Based on this,a system dynamics model for the contradiction between the supply and demand of urban mass transportation is further established,and each subsystem is analyzed.Then taking the Beijing-Tianjin-Hebei urban agglomeration as an example,the model was tested and simulated using Vensim software,and the development trend of the future population,economy,environment,total motor vehicle and traffic supply and demand contradictions of Beijing-Tianjin-Hebei urban agglomeration was predicted.Through simulation,it is found that according to the current development trend,the traffic supply of Beijing-Tianjin-Hebei urban agglomeration is less than the traffic demand,and the contradiction between transportation supply and demand will be further expanded.Finally,by changing the input value of the contradictory model of traffic supply and demand in the Beijing-Tianjin-Hebei urban agglomeration,and taking the size of the contradiction between the supply and demand of urban agglomerations as the observed indicators,opinions are raised from three aspects of population,economy and environment,such as controlling the population number of the core cities of the city group,optimizing the distribution of population,achieving the transformation from "central" to "network mode";optimizing the layout of economic regions,increasing investment in transportation funds,improving the inter-city transportation infrastructure,and forming a networked transportation system;increasing the threshold of motor vehicles and increasing the relevant taxes,controlling the total number of motor vehicles and increasing the development and use of new energy vehicles,these suggestions will provide theoretical guidance for coordinating and controlling the contradiction between the supply and demand of urban agglomeration traffic.