Resilience Assessment of Urban Road Networks to Flooding Under Heavy Rainfall and Flooding
Extreme rainfall brings great challenges to the normal operation of urban road networks.To assess the resilience of road networks against flooding when coping with extreme rainfall,this paper adopts a scenario simulation method to analyze the impacts of heavy rainfall flooding disasters on road networks.To evaluate the connectivity of the road by whether the water depth of the road exceeds the water depth threshold,a comprehensive evaluation framework is developed with the node strength and the attenuation function of the road speed under different water depths as the calculation indexes.Based on the performance change curve of the road system under rainfall-waterlogging process and 4R feature theory,the resilience of the road network against flooding is analyzed under four heavy rainfall recurrence periods.An enhancement strategy is proposed to improve the resilience of the road network to flooding by retrofitting flood-prone transportation hubs.The results show that:the impact of rainfall on the service performance of the road network is greater than that on the structural performance of the road network.The flood resilience of the road network decreases with the increase of the rainfall return period.The degree of inundation of the road is related to both the road class and the intensity of the rainfall.The flood-prone transportation hub has a greater impact on the flood resilience of the road network and the smaller the rainfall return period is,the greater the impact is.With the implementation of the upgrading strategy,the robustness and rapidity of the road network can be improved significantly,thus enhancing the resilience of the road network against flooding.
万方数据
维普
