Large-scale road network vulnerability analysis: a sensitivity analysis based approach |
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Authors: | Paramet Luathep Agachai Sumalee H W Ho Fumitaka Kurauchi |
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Institution: | (1) Department of Civil and Structural Engineering, The Hong Kong Polytechnic University, Hong Kong SAR, China;(2) Department of Civil Engineering, Gifu University, Gifu City, Japan |
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Abstract: | Traditionally, an assessment of transport network vulnerability is a computationally intensive operation. This article proposes
a sensitivity analysis-based approach to improve computational efficiency and allow for large-scale applications of road network
vulnerability analysis. Various vulnerability measures can be used with the proposed method. For illustrative purposes, this
article adopts the relative accessibility index (AI), which follows the Hansen integral index, as the network vulnerability
measure for evaluating the socio-economic effects of link (or road segment) capacity degradation or closure. Critical links
are ranked according to the differences in the AIs between normal and degraded networks. The proposed method only requires
a single computation of the network equilibrium problem. The proposed technique significantly reduces computational burden
and memory storage requirements compared with the traditional approach. The road networks of the Sioux Falls city and the
Bangkok metropolitan area are used to demonstrate the applicability and efficiency of the proposed method. Network manager(s)
or transport planner(s) can use this approach as a decision support tool for identifying critical links in road networks.
By improving these critical links or constructing new bypass roads (or parallel paths) to increase capacity redundancy, the
overall vulnerability of the networks can be reduced. |
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Keywords: | |
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