Assessment of urban flood impact on traffic flow based on scenario simulations

SHAO Weiwei; LIU Jiahong; WANG Kaibo; SU Xin; SHAO Rui; MEI Chao; LI Zejin

doi:10.16511/j.cnki.qhdxxb.2022.22.012

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Journal of Tsinghua University(Science and Technology) ›› 2022, Vol. 62 ›› Issue (10) : 1591-1605. DOI: 10.16511/j.cnki.qhdxxb.2022.22.012

DISASTER PREVENTION AND MITIGATION

Assessment of urban flood impact on traffic flow based on scenario simulations

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Abstract

The indirect impact of urban floods on traffic networks was studied using one and two dimensional coupled hydrodynamic models for extreme rainfall scenarios.The Qianshan River Basin in Guangdong Province was used as the study area.Open street maps (OSM) and the Baidu Map application programming interface (API) were used to obtain the traffic road network and real-time vehicle speed data to analyze the impact of urban floods on traffic.The results show that for all levels of urban roads,the traffic speed exhibits the tidal phenomenon during weekday commutes with more serious traffic congestion during the evening rush hours.During extreme rainfall events,the absolute decreases in the speeds are larger on high-quality roads than on low-quality roads.The affected sections are longest on tertiary roads,express ways have the largest portion of the affected sections,and tertiary roads have the longest transit times per unit length.For the rainstorm design return period increasing from 20 a to 50 a,the number of affected roads increases the most.This study assesses traffic flows when dealing with heavy rainfalls and floods as a theoretical basis for urban flood management and damage assessments.

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urban flood / traffic network / road interruption / traffic speed / driving time

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SHAO Weiwei, LIU Jiahong, WANG Kaibo, SU Xin, SHAO Rui, MEI Chao, LI Zejin. Assessment of urban flood impact on traffic flow based on scenario simulations[J]. Journal of Tsinghua University(Science and Technology). 2022, 62(10): 1591-1605 https://doi.org/10.16511/j.cnki.qhdxxb.2022.22.012

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