可达性研究动态及测算模型修订

Dynamics of Accessibility Research and A Revised Calculation Model

可达性在地理、交通、经济、规划等学科领域的应用日益广泛,但其概念和测算方法仍在不断的探讨之中。通过考察可达性的概念及其有关的研究动态,将可达性定义为空间网络中其他节点的某种流量借助某种交通方式抵达目标节点的难易程度。对5种主要的可达性模型进行比较,将交通站点通勤频次引入基于加权最短旅行时间的可达性模型,提出一个修订的可达性测算模型。运用全国168个地级及以上城市2011年的数据,对未修订和修订的可达性模型的测算结果进行分析对比,修订的可达性模型更能真实地反映可达性信息。

The accessibility is applied in traffic, geographical, economic and other fields more and more widely, but its concept and calculation method is still in constant discussion. This paper examines the concept of accessibility and its research dynamic, and defines accessibility as the difficult-easy degree of some other points＇ flow arrive at the target point by some way in a network. By comparing the main 5 kinds of accessibility calculating models, this paper introduces an revised accessibility model with commuting frequency, which is based on the weighted shortest travel time model. Using the 168 prefecture-level cities＇ data in 2011, this paper compared the results of the unrevised model and the revised model, and the results show that the revised model can more truly reflect the accessibility information in the real world.