Abstract
In order to explore changes in accessibility and connectivity of urban traffic network before and after the construction of subway, traffic networks within the Second Ring road, Hohhot, was analyzed based on complex network theory. Firstly, the urban road traffic network and the urban compound traffic network with the adjunction of the subway to former were mapped. Secondly, the node degree, clustering coefficient, average path length and node strength of the two networks were calculated based on SuperMap. Finally, the eigenvalues obtained above were compared and analyzed. Results show that both of the two traffic networks have some characteristics of small clustering coefficient reflected in random network and scale-free network. The latter, compared to the former, network diameter and average shortest path reduce, the average node degree and average node intensity increase. That is to say, with the adjunction of the subway, the connectivity and the accessibility of the entire network are significantly improved, and its carrying capacity increases remarkably.
Highlights
Subway plays an important role in improving traffic conditions as a high capacity and long distance and fast transportation mode, and with the adjunction of subway, the structure and evolution of urban traffic network will be impacted
Some studies on urban compound traffic network which is a combination of subway network and road network are conducted respectively in Statistical topological Characteristics, carrying capacity and evolution [1,2,3]
Degree is defined as the degree of node i, it represents the number of edges connected to node i, the greater is, the greater the influence node i has on the entire network; represents the degree distribution function, which refers to the probability that a node has a number of k edges connected in network, and it reflects the macro-statistical characteristics of the network system
Summary
Subway plays an important role in improving traffic conditions as a high capacity and long distance and fast transportation mode, and with the adjunction of subway, the structure and evolution of urban traffic network will be impacted. Because topological structure of urban traffic system are similar to that of complex networks, many scholars make traffic networks researches based on complex network theory. Some studies on urban compound traffic network which is a combination of subway network and road network are conducted respectively in Statistical topological Characteristics, carrying capacity and evolution [1,2,3]. Based on complex network theory, in this paper, the impact of subway on character, structure and carrying capacity of the urban traffic network were concluded by comparing and analysing its statistics eigenvalues before and after the construction of subway. It’s assumed that both of them were undirected networks
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