城市轨道交通规划网络与城市规划的综合协调性量化分析

运用分形理论分析了城市轨道交通规划网络与城市规划在多半径多方向的综合协调性; 基于网络等效长度提出了城市轨道交通规划网络的扇形维数和城市道路规划网络的扇形维数, 基于等效车站提出了城市轨道交通规划车站的扇形维数; 借鉴人口分形维数, 提出了城市交通需求的扇形维数; 运用4个扇形维数, 建立了基于向量相似度和分维一致性的城市轨道交通规划网络与城市规划的综合协调性评估指标; 以南充市2种城市轨道交通规划网络方案为例, 研究了城市轨道交通规划网络与南充市城市规划的综合协调性。研究结果表明: 随着研究半径的增大, 扇形维数的均值逐渐减小, 与城市轨道交通规划网络和城市规划的情况相一致; 城市轨道交通规划网络与城市规划的向量相似度越高, 其在方向上的匹配程度越高; 城市轨道交通规划网络与城市规划的分维一致性越强, 其在研究区域内的协调性越高; 仅从分维一致性不能全面反映城市轨道交通规划网络与城市规划的协调性, 需要结合向量相似度与分维一致性全面分析; 城市轨道交通规划网络与城市规划的协调性随研究半径的变化而改变, 当研究半径分别为3、6、9、12、15 km时, 方案1与南充市城市规划的综合协调性指标分别为0.48、0.45、0.40、0.53、0.43, 方案2与南充市城市规划的协调性指标分别为0.40、0.50、0.48、0.51、0.47;2种方案与城市的协调性指标与实际情况相符合。可见, 本文计算的指标和方法适用于城市轨道交通规划网络与城市规划的综合协调性评价。 

Comprehensive coordination quantitative analysis of urban rail transit planning network and urban planning

The comprehensive coordination between urban rail transit planning network and urban planning in multi-radii and multi-directions was analyzed based on the fractal theory, the sector dimensions of urban rail transit planning network and urban road planning network based on network equivalent length were proposed, and the sector dimension of urban rail transit planning stations based on the equivalent stations was proposed. The sector dimension of urban traffic demand was proposed referring to the fractal dimension of population. The comprehensive coordination evaluation indicator of urban rail transit planning network and urban planning based on the vector similarity and fractal consistency was established by using the four sector dimensions. Taking two schemes of urban rail transit planning network in Nanchong as examples, the comprehensive coordination between urban rail transit planning network and urban planning was analyzed. Analysis result shows that the mean of the sector dimension decreases with the increase of research radius, and it's consistent with the urban rail transit planning network and urban planning. The higher the vector similarity between urban rail transit planning network and urban planning, the higher the matching degree in directions. The stronger the fractal consistency between urban rail transit planning network and urban planning, the better the coordination in the research area. The coordination between urban rail transit planning network and urban planning cannot be fully reflected only from the fractal consistency, it should be analyzed by combining the vector similarity and fractal consistency. The coordination between urban rail transit planning network and urban planning changes with the change of research radius. When the research radius is 3, 6, 9, 12 and 15 km, respectively, the comprehensive coordination indicator between scheme 1 and urban planning in Nanchong is 0.48, 0.45, 0.40, 0.53 and 0.43, respectively, and the comprehensive coordination indicator between scheme 2 and urban planning in Nanchong is 0.40, 0.50, 0.48, 0.51 and 0.47, respectively. The values of coordination indicators between the two schemes and urban planning in Nanchong are consistent with the reality. Therefore, the indicators and method are applicable to the comprehensive coordination evaluation of urban rail transit planning network and urban planning.