Analysis on driving factors of urban flooding/waterlogging for different zones in Jincheng City

Taking into account the flooding/waterlogging problems of different spatial characteristics of cities is the key to improve the flood prevention and drainage capacity of cities. Taking the main urban area of Jincheng City as an example, this paper improved a SWMM-ICM-WCA2D model to simulated the drainage and surface inundation states of pipe networks under different rainfall scenarios and analyzed the driving factors of urban flooding/waterlogging for two types of substrates, namely, dense pipe network areas and sparse pipe network areas, with different degrees of development. The results showed that waterlogging in dense pipe network areas was mainly influenced by rainfall intensity, pipe network drainage capacity and topographic features, and the design standard of the current pipe network in the main urban area was low, and the drainage capacity has saturated under the 5-year rainfall condition. The water depth in the inundation area with elevation less than 751 m in the sparse area of the pipe network was larger, and the water depth in the rest of the area with large elevation was smaller while the flow rate was larger. Under different rainfall scenarios, the correlation between pipe network indicators and inundation elements was strong, especially at large water depths (>1 m).