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Study of Local Traffic Flow Fluctuation under Rainfall and Waterlogging with Characteristics of Dynamic Spatiotemporal Changes
| 题名： | Study of Local Traffic Flow Fluctuation under Rainfall and Waterlogging with Characteristics of Dynamic Spatiotemporal Changes |
| 正文语种： | eng |
| 作者： | Xiaoyong Ni;Hong Huang;Yi Liu;Kai Liu;Ming Wang;Jun Hu |
| 作者单位： | School of National Safety and Emergency Management Beijing Normal Univ. at Zhuhai Zhuhai 519087 China Academy of Disaster Reduction and Emergency Management Ministry of Emergency Management & Ministry of Education Beijing Normal Univ. Beijing 100875 China Institute of Public Safety Research Dept. of Engineering Physics Tsinghua Univ. Beijing 100084 China;Institute of Public Safety Research Dept. of Engineering Physics Tsinghua Univ. Beijing 100084 China;Institute of Public Safety Research Dept. of Engineering Physics Tsinghua Univ. Beijing 100084 China;Academy of Disaster Reduction and Emergency Management Ministry of Emergency Management & Ministry of Education Beijing Normal Univ. Beijing 100875 China School of National Safety and Emergency Management Beijing Normal Univ. at Zhuhai Zhuhai 519087 China;Academy of Disaster Reduction and Emergency Management Ministry of Emergency Management & Ministry of Education Beijing Normal Univ. Beijing 100875 China School of National Safety and Emergency Management Beijing Normal Univ. at Zhuhai Zhuhai 519087 China;Institute of Public Safety Research Dept. of Engineering Physics Tsinghua Univ. Beijing 100084 China |
| 关键词： | Traffic flow fluctuation; Traffic modeling; Rainfall and waterlogging; Variable cell transmission model (VCTM); Dynamic spatiotemporal changes |
| 摘要： | It is common knowledge that rainfall and rain-induced waterlogging have negative impacts on urban road traffic in that they could cause decreased traffic flow capacity and induce traffic congestion from a macroscopic view. What is the ultimate cause behind the phenomenon from a micro perspective, however, is still unclear. This paper proposes a variable cell transmission model (VCTM) considering the influence of rainfall and waterlogging on traffic parameters based on the key findings from a previous experiment-simulation study. A typical local traffic network in a city with seven road sections was chosen as a study area, and a case study was conducted in a scenario of rainfall and waterlogging based on the proposed model. The results comprehensively profile how rainfall and waterlogging induce flow fluctuation and density fluctuation. It is found that road capacity is a dominant factor influencing the flow fluctuation, and the flow fluctuation tends to be much more violent near the ponding areas. It is also found that density increases with increased rainfall intensity and water depth, and the density increase caused by waterlogging seems to be more significant. Another important discovery is made that density of some roads could increase violently due to insufficient capacities of downstream roads. These valuable findings from this study help better understand the influence of rainfall and waterlogging on urban traffic flow. This work can also help guide the emergency response by the corresponding government department when encountering rainfall and waterlogging. |
| 出版年： | 2022 |
| 期刊名称： | Journal of Transportation Engineering |
| 卷： | 148 |
| 期： | 7 |
| 页码： | 04022039.1-04022039.17 |
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