河南省公路网络的可达性空间格局及其演化特征

Spatial Structure and Evolution of Highway Accessibility in Henan Province

以最短时间和可达性系数为指标,在ArcGIS的支持下,对1986,1996和2006年3个时间断面的河南省公路交通可达性进行了分析。结果显示,河南省公路网络连接的县级城市可达性值以中部及中北部为核心,向外围逐渐增高,大致呈不规则环状分布格局;研究期内,可达性空间格局总体变化不是很大,可达性比较好的县级城市主要位于河南省的中部及中北部,可达性较差的县级城市均分布在河南省的边缘地带,3个时间断面中,新县、台前始终是可达性最差的2个县;随着河南省公路网络建设的逐步完善,河南省整体可达性及各县的可达性均有大幅度的提高,但不同阶段可达性的提高幅度又有所不同,1986—1996年各县可达性值减少率高于1996—2006年各县可达性值减少率。

Choosing the shortest time and accessibility coefficient as indicators, based on the highway network map in 1986, 1996 and 2006, the spatial structure and evolution of cities highway accessibility in Henan are elaborated in the paper. Some conclusions are drawn as follows： the center of the highway accessibility value of the cities connected by the highway system turn out to be＂ central and north-central＂ , and the value increases from the center to the surrounding. In the past 20 years, the spatial structure of accessibility in Henan has little change, the cities that accessibility are good are located in the central and north-central of Henan Province, the cities that accessi- bility are poor are located on the edge of Henan Province, and among the three time sections, Taiqian and Xinxian are the worst. The improvement of highway system upgrades the accessibility of cities in this region, but the accessibility increases takes on different characteristics in different stages, and the accessibility reducing in 1986--1996 is greater than that in 1996--2006.