Research On The Layout Of Urban Agglomeration Comprehensive Transportation Hub Based On Spatial Structure Coordination

With the continuous advancement of urbanization,neighboring cities with certain conditions are gradually grouped into urban clusters to better meet their development needs.The comprehensive transportation system of urban agglomeration is the basic condition for each region or town in urban agglomeration to communicate and contact with each other.As a key node in the comprehensive transportation network structure of urban agglomerations,the comprehensive transportation hub of urban agglomerations is the main gathering and distributing place of passengers and goods both inside and outside the comprehensive transportation system of urban agglomerations.It is a necessary intersection to realize the organic connection of various transportation modes and the reasonable allocation of transportation resources.Therefore,it is necessary to pay attention to the layout of comprehensive transportation hub while planning and building the comprehensive transportation network of urban agglomeration.However,at present,the consideration of comprehensive transportation hub is still focused on a single city,which ignores the overall overall planning and coordination layout from the urban agglomeration level,and also lacks the consideration of the coordination between hub layout and urban agglomeration spatial structure.Therefore,on the premise of considering the coordination between the spatial structure of urban agglomeration and the layout of comprehensive transportation hubs,this paper studies the layout of comprehensive transportation hubs in urban agglomeration.Based on the space form,economic structure,population spatial distribution,the structure of the comprehensive transportation network these aspects of urban agglomeration spatial structure is analyzed,from the layout of the influencing factors and hub room service characteristics of comprehensive transportation hub layout is analyzed,and the urban agglomeration spatial relationship between structure and layout of the comprehensive transportation hub is analyzed in this paper.After determine the coordination degree calculation index,using the fractal theory and some mathematical methods,respectively given space form structure,the spatial distribution of population,economic structure,comprehensive transportation network that several subsystems and hub layout coordination degree calculation method and the comprehensive transportation hub layout with the urban agglomeration spatial structure calculation method of the comprehensive coordination degree.Finally,with the goal of maximizing the coordination degree between the spatial structure and the layout of comprehensive transportation hubs at the lower level and the goal of maximizing the social benefits at the upper level,a two-layer programming model of the layout of comprehensive transportation hubs based on the coordination of spatial structure is constructed,and the solving method and algorithm flow of the model are given based on the genetic algorithm.Based on the comprehensive transportation hub of chengdu-chongqing urban agglomeration layout,for example,within the article puts forward the urban agglomeration of comprehensive transportation hub layout method,model and algorithm for validation,this thesis found the urban comprehensive transportation hub layout method is feasible,rational and practical,can avoid the conventional hub layout method with qualitative method directly when alternatives,are the deficiencies;Through the analysis and calculation of case data,the model and solving algorithm are verified to be operable.To some extent,the research results of this paper enrich the theoretical system of the comprehensive transportation hub layout of urban agglomeration,and provide theoretical reference and basis for the practice of the comprehensive transportation hub layout of urban agglomeration under the background of new urbanization.