To uncover the cross-system cascading propagation mechanism of urban waterlogging disaster chains and enhance blocking effectiveness, a coupled drainage-traffic network model was first constructed based on complex network theory, integrating high-precision topographic data, real-time traffic flow, and historical flooding records. A dynamic cascading-failure algorithm was then employed to quantify node centrality and link vulnerability, thereby dissecting the cross-system propagation path from "rainstorm-runoff-ponding-traffic paralysis". Finally, a three-level resilience blocking strategy—critical-node reinforcement, redundant-road-network optimization, and intelligent-response coordination—is proposed. The results show that pump-station expansion and redundant road design can effectively reduce waterlogged area and shorten traffic-interruption duration. And this enhances the system resilience and proactive immunity of critical urban infrastructures. It shifts the disaster-prevention paradigm from passive emergency response to active immunity.

complex networks  /  urban waterlogging  /  disaster cascade  /  cascading failure  /  blocking