Abstract:Under the background of global climate change, extreme rainfall has occurred frequently in recent years. As the population and assets are highly concentrated in urban area, in case of rainstorm and flood exceeding the design standard, it may affect the normal operation of the whole lifeline system, even endanger the life of people. Due to the special geographical location and climatic conditions, Shanghai is extremely vulnerable to typhoon, flood and storm surge disasters and their combination. Using the existing flood and water-logging simulation model of Shanghai urban area, Zhengzhou "7 · 20" extreme rainstorm in three scenarios are simulated and analyzed with Xuhui District, Huangpu District and Century Avenue of Pudong New District as the rainstorm center respectively. The results show that, the overall inundation with the rainstorm center located in Century Avenue of Pudong New District is more serious than the other two scenarios. Under the three scenarios, the water depth of most areas of Shanghai urban area exceeds 0.5 m, and the maximum inundation area is 1597.3 km2. The total length of the waterlogged roads is more than 800 km, and the waterlogged road in the central urban area is particularly serious. The maximum water depth of roads is about 1.35 m, which will cause extremely serious impacts and losses. The maximum water depths at five typical locations, including Huashan Hospital, Wujiaochang, Tibet south road tunnel, Pudong Airport and the vicinity of Century Avenue, are 0.70 m, 0.60 m, 0.46 m, 0.59 m and 0.94 m respectively. The analysis results can provide some reference for Shanghai flood and drought disaster prevention departments to formulate Extreme rainfall response schemes.