城市内涝灾害对应急救援服务可达性的影响评估OACSTPCD

[Objective]The acceleration of the urbanization process and the impact of climate change led to the frequent occur-rence of urban flooding,[Results]ing in road closures and traffic congestion.The timeliness of urban emergency response was significantly affected.To accurately assess the emergency response capability during storm-induced flooding,[Methods]Liwan District was taken as an example.A hydrodynamic model was constructed to simulate flooding scenarios under different rainfall intensities.Road flooding risks were identified,blocked roads were specified,and,utilizing the Two-Step Floating Catchment Area(2SFCA)method,the accessibility of emergency rescue services for different vulnerable points of interest(POIs)was as-sessed.[Results]Results indicate that,with the increase in the return period of rainfall,the flooded area and average water depth increased.The number of affected roads and the length of blocked roads rose by over 300％.As the number of blocked roads increased,the accessibility of emergency rescue services to POIs showed a decreasing trend,dropping by more than 40％within different time thresholds.[Conclusion]The findings suggest that the overall pattern of blocked roads can be revealed by the coupled urban flood model,and the timeliness of emergency response can be rapidly estimated by the accessibility model.These results provide valuable insights for the evaluation of emergency response capabilities.