China Coal Resource Railway Circulation Network’s Structural Characteristic and Evolvement
运用复杂网络理论分析1998-2008年中国煤炭资源铁路流通网络的空间特征、拓扑结构及子群变化，发现网络密度和聚类系数上升、平均路径长度下降，形成西北、东北、东南、西南四个子群。
Rapid economy increase drive strong energy demand of China in recent years,provinces build complex network contact because of coal resource railway transportation.In this paper,complex network theory was used to analysis China coal resource railway circulation network’s spatial characteristic and topological structure and subgroups change from 1998 to 2008.Results indicate: firstly,in national coal resource railway circulation network,Shaanxi Province and Henan Province and Gansu Province is main hub of main network and take on radial structure in space;coal circulation size have great difference in provinces,the biggest flow scale present from Shaanxi Province to Hebei Province.Secondly,topological analysis indicate that density and cluster coefficient of national coal resource railway circulation network is increasing and average path length is deceasing,network whole structure is optimizing and nodes degree distribution show rank-scale rule.Thirdly,geographical adjacent provinces have more contact and easy to form subgroup after competition and recombination.There are four subgroups in China coal resource railway circulation network that are northwest and northeast and southeast and southwest.Contact densities keep increasing both in subgroup and inter subgroup,but provinces contact in subgroup is more than inter subgroup.