基于要素分解的西宁市公共交通可达性空间特征

摘要

Based on the ArcGIS spatial analysis function,the accessibility and correlation degree of urban public transport in Xining city are discussed by using the reachability model and the optimal scale decomposition method.The results show that the design of the bus line in Xining city is unreasonable,the line mileage and the non-linear coefficient of the line are out of the national standard,and the average level of the line network density is different.The accessibility is distributed from the center of the belt to the symmetrical descending distribution.The distribution degree and the distribution uniformity are low,and there are the regional superiority and the regional bad value.The spatial accessibility distribution is similar to the time accessibility distribution.The cost of accessibility is obviously different from the time and space accessibility.Comprehensive accessibility of the overall distribution presents the decreasing rule from the center to the surrounding,and correlating with time and space accessibility,and low correlating with the cost of relevance.To promote the public transport accessibility,it should improve the construction of hub station,increase the urban new district line,and promote the optimization speed of line network.%以公交线路首末站为节点,借助ArcGIS空间分析功能,采用可达性模型、最优尺度分解等方法,探讨西宁市城市公共交通要素可迭性及关联度.结果表明:西宁市公交线路设置不合理,线路里程及线路非直线系数多数超出国家标准,线路网密度平均水平相差较大;可达性呈现由带状中心向四周对称递减分布的规律,集中分布程度较高,分布均匀度较低,出现区域优值和区域劣值;空间与时间可达性分布相似,费用可达性与时空可达性明显不同;综合可达性总体分布呈现由中心向四周递减规律,与时间和空间可达性相关度高,与费用可达性相关度低.完善枢纽站建设、增加城市新区线路、推进线网优化速度可提高城市公共交通可达性.