| The road network is like the blood of the urban system,and it is a deep description of the urban self-organization texture.As a complex open giant system,the spatial complexity of its structure and efficiency emerges and the self-organization mechanism has not been effectively revealed.The results of the research on the development of the inter city road network are as follows: the operation of the inter city road network is inefficient,the traffic accidents are frequent and the air pollution is aggravated.Therefore,the integration of complex network and based on GIS technology,considering the road grade,speed difference and city administrative boundary effect,construct the weighted center model and weighted network efficiency model with geographical significance,multi-scale and multi-dimension reveals the heterogeneity of China intercity highway network structure and efficiency,this paper emphatically analyzes the self the efficiency of network organization China intercity road and its organization mechanism.The study found that:(1)as a typical two-dimensional graphs,the overall Chinese intercity road network structure presents a class of small world network is characterized by having a shorter average path length and high clustering coefficient;weighted centrality(degree centrality,closeness centrality and betweenness centrality)and connectivity index show the distribution and characteristics of size distribution of order,the formation of core periphery structure hierarchical,with obvious heterogeneity and hierarchy.This imbalance in space show the weighted degree,betweenness and weighted closeness respectively showing "Dong Lin inferior",the axial distribution and the level of target shape distribution.(2)the network efficiency of China intercity road also has a "first" uneven distribution characteristics,the overall form "East High and west low" gradient distribution in the local area,showing a "core periphery" and "axis" spatial differentiation;among them,the "core" areas of national road network Hub area,the scope of "follow the node efficiency more than global efficiency more than local efficiency rank law;in addition,intercity highway network efficiency has significant spatial autocorrelation and agglomeration characteristics,with low low concentration and high high agglomeration types,the highly concentrated cold areas in the Northeast(black,Kyrgyzstan two),Northern Liaoning Province and Northwest(new,Qinghai,Tibet provinces and Ningxia,Gansu,Shaanxi,most of the Southwest(Yunnan Guizhou Guangxi)three Sichuan Province and other regions,most)hot zones are relatively gathered in Beijing Tianjin Hebei,Yangtze River Delta and Pearl River Delta city The eastern developed regions.(3)under the combined action of local random intervention and macro planning control,the inter city highway network is becoming more and more complex.On the whole,showing the same coordination between intercity highway network connectivity with adjacent nodes,the emergence of "rich club" phenomenon and the "Matthew effect",the node connectivity and clustering,clustering and correlation between accessibility level is weak,the node connectivity between sex and accessibility has almost no correlation characteristics of city road network;the efficiency of its social and economic development level and the terrain environment coupling,the traffic efficiency affected by the external environment is more significant on a regional scale,each index between the emergence characteristics of significant spatial agglomeration. |
PDF Full Text Request