成渝地区双城经济圈流空间网络特征

Characteristics of Flow Spatial Network in the Chengdu-Chongqing Economic Circle

以“流”空间表征的城市空间网络能更好地刻画城市间的空间联系.该研究以经济流和交通流作为流空间的表达参数,利用空间可视化和社会网络分析手段,对成渝地区双城经济圈流空间网络格局进行解析.结果发现:①成渝地区经济流和交通流网络整体呈现“双核一轴两带”的空间格局,“双核”强向心性明显,但在川渝交界地区形成“毗邻区塌陷”,省界对空间流的阻隔效应还十分明显;②经济流网络中与一级中心城市邻近的城市其中心度更高,地理邻近效应显著,而交通流网络中的城市中心度具有交通趋向性,沿铁路干线的城市中心度等级更高;③经济流网络大致形成成都-重庆中心城区、川南、南遂广、万开云、渝西等5个次级组团,交通流网络中的城市组团则处于零散状态;④相较于经济流,交通流更能发挥时空压缩效应,带动区域空间网络向多中心、组团化演化,推进成渝地区一体化发展.

The urban spatial network represented by the“flow”data can better describe the spatial links between cities.Based on the economic flow and traffic flow,this paper uses spatial visualization and social network analysis to analyze the spatial network pattern of the Chengdu-Chongqing economic circle.The results showed thatthe overall economic flow and traffic flow network in Chengdu-Chongqing Area presents a spatial pattern of“dual cores,one axis and two belts”.The“dual cores”has obvious strong centripetality,but the“adjacent area collapse”formed at the junction area of Sichuan Province and Chongqing City.It means the blocking effect of the provincial barrier on the spatial flow is still very obvious.Cities adjacent to the first-level central cities in the economic flow network have higher centrality and significant geographic proximity effects.The urban centrality in the traffic flow network shows a traffic tendency,and the cities along the main railway are in the higher levels.Five city clusters in the economic flow network can roughly be recognized:Chengdu-Chongqing,Southern Sichuan,Nanchong-Suining-Guangan,Wanzhou-Kaizhou-Yunyang,and Western Chongqing.The city clusters in the traffic flow network are fragmentally distributed.Compared with economic flow,traffic flow can exert the effect of space-time compression to drive the trend of multi-center and multi-cluster regional network,and promote the integrated development of Chengdu-Chongqing Area.