农村公路养护项目区位重要性计算方法

Calculation Method of Geographical Importance for Rural Road Maintenance Project

为高效利用养护资金,实现对农村公路养护项目决策中道路区位重要性的客观判断,运用对偶拓扑方法抽象公路网,从网络中心性角度选取节点度、中间中心度、接近中心度三个指标表征道路重要性,讨论了邻居节点对节点重要性的影响规律,综合三个中心性指标和邻居节点影响提出了区位重要性计算方法。以浙江省某县的农村公路网为例,对A,B,C,D,E,F共6条县道进行重要性计算,评价值为0.1888,0.2108,0.9973,0.2141,0.0053,0.7516,重要性由高到低依次为C,F,D,B,A,E。研究结果表明:节点度、中间中心度、接近中心度和邻居节点的影响能从道路自身属性和其他道路影响两方面反映道路在路网中的区位重要性。

To use maintenance funds efficiently, and realize the objective judgement of the geographical importance of rural highway maintenance project during the decision-making process, dual topology was used to make highway network abstract. And from network centrality perspective, three indicators includ- ing node degree, intermediate centrality, closeness centrality were selected to show the importance of ru- ral road, and the influence laws of neighbor nodes on node importance were discussed, and the method to calculate road＇s geographical importance were proposed by integrating three centrality indicators and neighbor nodes＇ influence. Taken the rural road network of one county in Zhejiang Province as an example, the importance of 6 county roads namely A, B, C, D, E, F was calculated, and their evaluation value was 0.188 8, 0.210 8, 0.997 3, 0.214 1, 0.005 3, 0.751 6 respectively, and their importance level from high to low was ranked as C, F, D, B, A, E. The study result shows that the influence of node degree, intermediate centrality, closeness centrality and neighbor nodes can reflect road＇s geographical importance in highway network from two aspects： road＇s properties and other roads＇ influences.