Dynamic Assessment of Road Network Vulnerability Based on Cell Transmission Model

The road network maintaining stability is critical for guaranteeing urban traffic function. Therefore, the vulnerable links need to be identified accurately. Previous vulnerability research under static condition compared the operating states of the old equilibrium before the event and the new equil...

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Main Authors: Yu Sun, Binglei Xie, Shan Wang, Dazhuang Wu
Format: Article
Language:English
Published: Hindawi-Wiley 2021-01-01
Series:Journal of Advanced Transportation
Online Access:http://dx.doi.org/10.1155/2021/5575537
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spelling doaj-71a7bcd23f4e4fe5972b67cb4ba2fa162021-06-14T00:16:47ZengHindawi-WileyJournal of Advanced Transportation2042-31952021-01-01202110.1155/2021/5575537Dynamic Assessment of Road Network Vulnerability Based on Cell Transmission ModelYu Sun0Binglei Xie1Shan Wang2Dazhuang Wu3School of ArchitectureSchool of ArchitectureSchool of ArchitectureSchool of ArchitectureThe road network maintaining stability is critical for guaranteeing urban traffic function. Therefore, the vulnerable links need to be identified accurately. Previous vulnerability research under static condition compared the operating states of the old equilibrium before the event and the new equilibrium after the event to assess vulnerability ignoring the dynamic variation process. Does road network vulnerability change over time? This paper combines the vulnerability assessment with the traffic flow evolution process, exploring the road network vulnerability evaluation from the perspective of time dimension. More accurate identification and evaluation of vulnerable nodes and links can help to strengthen the ability of road network resisting disturbances. A modified dynamic traffic assignment (DTA) model is established for dynamic path selection (reselect the shortest path at the end of each link) based on the dynamic user optimal (DUO) principle. A modified cell transmission model is established to simulate the traffic flow evolution processes. The cumulative and time-varying index of vulnerability assessment is established from the viewpoint of traveler’s time loss. Then the road network vulnerability assessment combined the traffic flow model with the vulnerability index. The road network vulnerability assessment of Bao’an Central District of Shenzhen, China, reveals that road network vulnerability does contain a dynamic process, and vulnerable links in each phase can be exactly identified by the model. Results showed that the road network would have a large vulnerability during the disordered phase when the main road fails. Therefore, prioritizing the smooth flow of main roads can weaken the impact of road network vulnerability exposure.http://dx.doi.org/10.1155/2021/5575537
collection DOAJ
language English
format Article
sources DOAJ
author Yu Sun
Binglei Xie
Shan Wang
Dazhuang Wu
spellingShingle Yu Sun
Binglei Xie
Shan Wang
Dazhuang Wu
Dynamic Assessment of Road Network Vulnerability Based on Cell Transmission Model
Journal of Advanced Transportation
author_facet Yu Sun
Binglei Xie
Shan Wang
Dazhuang Wu
author_sort Yu Sun
title Dynamic Assessment of Road Network Vulnerability Based on Cell Transmission Model
title_short Dynamic Assessment of Road Network Vulnerability Based on Cell Transmission Model
title_full Dynamic Assessment of Road Network Vulnerability Based on Cell Transmission Model
title_fullStr Dynamic Assessment of Road Network Vulnerability Based on Cell Transmission Model
title_full_unstemmed Dynamic Assessment of Road Network Vulnerability Based on Cell Transmission Model
title_sort dynamic assessment of road network vulnerability based on cell transmission model
publisher Hindawi-Wiley
series Journal of Advanced Transportation
issn 2042-3195
publishDate 2021-01-01
description The road network maintaining stability is critical for guaranteeing urban traffic function. Therefore, the vulnerable links need to be identified accurately. Previous vulnerability research under static condition compared the operating states of the old equilibrium before the event and the new equilibrium after the event to assess vulnerability ignoring the dynamic variation process. Does road network vulnerability change over time? This paper combines the vulnerability assessment with the traffic flow evolution process, exploring the road network vulnerability evaluation from the perspective of time dimension. More accurate identification and evaluation of vulnerable nodes and links can help to strengthen the ability of road network resisting disturbances. A modified dynamic traffic assignment (DTA) model is established for dynamic path selection (reselect the shortest path at the end of each link) based on the dynamic user optimal (DUO) principle. A modified cell transmission model is established to simulate the traffic flow evolution processes. The cumulative and time-varying index of vulnerability assessment is established from the viewpoint of traveler’s time loss. Then the road network vulnerability assessment combined the traffic flow model with the vulnerability index. The road network vulnerability assessment of Bao’an Central District of Shenzhen, China, reveals that road network vulnerability does contain a dynamic process, and vulnerable links in each phase can be exactly identified by the model. Results showed that the road network would have a large vulnerability during the disordered phase when the main road fails. Therefore, prioritizing the smooth flow of main roads can weaken the impact of road network vulnerability exposure.
url http://dx.doi.org/10.1155/2021/5575537
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AT shanwang dynamicassessmentofroadnetworkvulnerabilitybasedoncelltransmissionmodel
AT dazhuangwu dynamicassessmentofroadnetworkvulnerabilitybasedoncelltransmissionmodel
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