Research On Traffic Resource Allocation Of Urban Agglomeration Transportation Channel

With the rapid development of China's national economy and the continuous advancement of urbanization,the spatial pattern between regions has been transformed from a single city to an urban agglomeration.The urbanization trend of urban development has become an irreversible trend.Urban agglomeration has become a carrier of international and domestic competition..In the urban agglomeration space,the economic interaction between cities is frequent,the regional passenger and cargo flow is growing rapidly,and the development of urban agglomeration is inseparable from the support of transportation.As the backbone of the regional comprehensive transportation system,the urban group transportation channel mainly undertakes the passenger and cargo flow demand with large scale and direction,and guides the social and economic development of the urban agglomeration.However,the current comprehensive utilization rate of transportation resources in the channel is not high,and the transportation capacity is low;the coordination mode of each transportation mode is poor;at the same time,under the situation of the sudden increase of traffic pressure and the unreasonable allocation of channel resources,coordinate regional economy,resources and environment.The relationship with the four traffic parties is imperative.Therefore,in the current context,it is of great significance to study the optimal allocation of transportation resources in urban agglomeration transportation channels.Firstly,based on the basic concepts of urban agglomerations and transportation corridors,the paper expounds the definition,types and characteristics of transportation corridors and transportation resource allocation.Secondly,it focuses on the method of traffic channel demand forecasting.By summarizing various current traffic demand forecasting models and analyzing their advantages and disadvantages,combined with the traffic characteristics of traffic channels,a combined model of time series-BP neural network is established to predict channel traffic totals.Improve the gravity model for OD demand forecasting.Then the goal and principle of transportation resource allocation in urban agglomeration transportation channel are described.Based on the idea of two-layer planning,based on information entropy theory,the upper part of the planning objective function is constructed as the traffic supply and demand dynamic balance of traffic supply and demand structure entropy model,and from the channel The utility index,the technical and economic characteristics and the social greenness are introduced into the utility index.The lower-level planning objective function is established as the resource allocation model based on the channel comprehensive benefit maximization.At the same time,the genetic algorithm is designed to solve the model.Finally,taking the Chengdu-Chongqing urban agglomeration as an example,this paper analyzes the traffic supply capacity of the current Chengyu channel,based on the data of the economic,population and traffic volume of the five urban nodes in the Chengdu-Chongqing channel for the past five years,through the combined forecasting model and The improved gravity model obtains the OD distribution of each city in 2025 in the Chengdu-Chongqing channel,and constructs a two-layer optimal configuration model to optimize the transportation resources of the Chengdu-Chongqing channel.It is concluded that the transportation resource allocation plan can be used for the construction and investment of urban agglomeration channels.Meaning and practical value.