Research on the vulnerability of urban road traffic networks under rainstorm and waterlogging scenarios
To comprehensively and effectively evaluate the vulnerability of urban road traffic networks during rainstorm and waterlogging disasters,the failure process of the urban road traffic network under rainstorm conditions was reenacted by integrating the MIKE 21 hydrodynamic model with the cascade failure model of the urban road traffic network.The structural vulnerability and operating state vulnerability of the urban road network are comprehensively assessed by considering both the topological structure characteristics and traffic carrying capacity characteristics.Finally,the study focuses on the central urban area of Zhengzhou,where a rainstorm waterlogging numerical model is developed to analyze the distribution characteristics of water accumulation during different recurrence periods.This model deeply examines the changes in vulnerability of the urban road traffic network under the influence of waterlogging.According to the findings,in the four designed rainstorm scenarios,the area with water depths exceeding 30 cm showed a clear distribution trend of"less in the southwest and more in the northeast"within the inundation zone.The northeastern area of the central city of Zhengzhou was the primary concentration point for the inundation area,with some scattered,less concentrated areas in other parts.The distribution of impacted sections within the road traffic network mirrors that of the inundated areas,and the spatial distribution of vulnerability levels closely correlates with the spatial distribution of water depth.This correlation sheds light on the changes in vulnerability of the urban road traffic network under rainstorm conditions.Additionally,as the design recurrence period increased,there was a significant increase in the number of roads within the deep water area,coupled with a notable decrease in travel time weighted network efficiency.Specifically,as the rainstorm recurrence period extended from 50 years to 100 years,there was a particularly significant increase in the number of affected sections and the proportion of cascaded failure sections.This underscores the serious adverse impact that rainstorm-induced waterlogging can have on urban transportation systems.
万方数据
维普
