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中文摘要：
以兰州-西宁城市区域交通路网为例,基于空间句法模型、日常可达性模型和等时圈通过特征点算法,试图运用GIS技术将节点、轴线和域面结合起来对通达性进行全面阐述,多视角综合测度区域路网通达性的空间格局。研究结果表明：1.区域路网体系较为完善,路网线段集聚相对明显;线段式空间伸展格局呈＂点-轴＂状,轴线式空间伸展格局呈＂干-枝＂状,初步形成核心、过渡、外围三大等级圈层以及＂X＂字型路网骨架,区域交通运输与城镇发展水平表现出较强的共轭协同发展关系。2.等时圈沿国道、省道、县道扩散表现连续,沿封闭铁路、高速公路扩散出现跳跃,其等时圈空间特征多呈现＂枝-叶＂状。城镇日常可达性在较大程度上取决于区域中心性、周边路网发达程度和城镇密集程度,区域路网单中心极化现象比较明显,兰州市对整个区域路网的控制作用较为突出。3.区域通达度空间分布各异,核心板块破碎而外围板块连片。区域通达性差异极其显著,出现极高值区和极低值区;兰州与西宁通达度中高值区出现断裂,区域南部通达度极低值区连片成带。因此,应当构建兰州地区绕城高速和环状路网,实现路网交通的适度分流;加快兰州-西宁高等级快速交通建设,推进兰州-西宁区域一体化进程;建设兰成铁路和兰州至云南磨憨口岸高速通道,培育临夏为南部区域性中心城市。
英文摘要：
Accessibility is a research topic in the field of human geography, urban and regional planning, and transportation economics. With rapid increasing of application demands and unceasing development of technology researches, accessibility measurement approaches also develop swiftly and the methodology is being formed. This paper attempts to combine nodes, axes and area to elaborate accessibility in Lanzhou - Xining city region. Based on space syntax, daily accessibility and isochronous tings according to calculation of feature points, the spatial pattern of accessibility of road network are evaluated synthetically in multi-angle. The result shows： （ 1 ） The system of road network is better, and the concentration of road network is obvious. The spatial pattern of segment type stret- ches along the＂ point-axis＂ style while the spatial pattern of axis type stretches along the＂trunk-branch＂ shape. Core ring, transition ring, and periphery ring of three grade level as well as＂ X＂ shape of road network is preliminary form. It is shown to have a strong reciprocal-coordinate relationship between regional accessibility pattern and the entire development level of Lanzhou - Xining city region. （2） Spatial diffusion of isochronous ring along the nation- al road, provincial road, and county road is continuous while Spatial diffusion of isochronous ring along close rail- way and highway is leaps, which results in spatial characteristics of isochronous ring show＂ branch-leaf＂ shape. Ur- ban daily accessibility, to a great extent, depends on the regional geometric centre, the development level of the surrounding road network and intensive degree of urban or town. It is obviously for regional road network to polari- zation of single-center. The control action of Lanzhou city to the road network is apparent. （3） The spatial distribu- tion of regional accessibility is different, so that the fragmentation of the core plate is obvious and the continuity of the extend plate is apparent. The regional accessi
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