摘要
针对传统公交网络评价模型的不足,基于分形理论,构建加权分形模型,从网络均衡性、站点可达性、站点-线路异速生长性角度揭示了武汉市中心城区公交网络空间异质性:武汉中心城区公交网络并未形成严格意义上的分形,存在空间尺度依赖;公交线网发育相对迟缓,覆盖水平较低,且在分布形态上围绕测算中心呈强凝聚态展布;公交站点发育相对成熟,覆盖效果良好,其分布形态呈弱集聚态,但公交站点可达性空间差异明显,其发育程度与社会经济发展水平之间存在正相关和空间共轭关系;中心城区公交线路与公交站点建设空间不匹配,公交线网的建设呈现出明显的滞后性和对城市主干道的过度依赖性。建议加强6km半径范围外的城郊线路建设,撤销中心城区重复的公交线路,降低公交线路对城市主干路的依赖性。
Studies on the complexity and non-linearity of the spatial structure of road networks have attracted increasing attention during the past several years. However, few efforts have been devoted to the spatial and structural properties of Public Transportation Network（PTN）. For the inadequacies of the traditional PTN evaluation model, this paper introduces a weighted fractal model which based on fractal theory in order to reveal the spatial heterogeneity of PTN in Wuhan Center City Area（WC-CA） from three aspects （network equilibrium, site accessibility,site-line allometric growth）. The results are obtained as follow that the feature of PTN,in the strict sense,has not evolved a morphology formation of fractal,since the fractal growth has the spatial scale dependence. The relatively low value of bus lines fraetal dimension, which may show that the density attenuates quickly from its measuring core to periphery and their distribution pattern shows strong aggregation around WCCA, grow slow, indicating its weak filling capacity and low level of coverage while the high value （bus stations）presents a totally opposite result, which represents a strong filling capacity and high level of coverage. The difference of transit site accessibility space is obvious. Among all the sites in Wuhan, the accessibility space of Jianghan District is the highest one. There exists positive correlation and space conjugate relation between the development level of space accessibility and area economic development level. According to the bus line-bus station allometric growth model, the construction of bus lines and bus stations does not match in space. It indicates that there are two major points in optimizing the bus line system of Wuhan city： firstly, the number of the urban-suburban lines should be increased; secondly,the repeating lines in city area need to be canceled.
出处
《地理与地理信息科学》
CSCD
北大核心
2013年第2期66-71,共6页
Geography and Geo-Information Science
基金
国家自然科学基金项目(41201130
41101361)
国家社会科学基金项目(11CJL048)
关键词
加权分形模型
公交网络
空间复杂性
武汉市中心城区
weighted fractal model
public transportation network
spatial complexity
Wuhan Center City Area
