A preliminary assessment on spatial prioritization for integrated urban flood management based on source tracking method

Abstract

With rapid urbanization and global climate change, the frequency of extreme rainfall and urban flooding has increased significantly, posing a serious threat to human life and property safety. Integrated urban flood management is an important component of urban planning that combines various infrastructure to effectively manage and utilize stormwater. This is essential for dealing with urban inundation disasters. Despite the implementation of numerous engineering and non-engineering measures, flood mitigation still faces a challenge in identifying spatial prioritization due to the lack of consideration for regional spatial connectivity. Taking Jinan City, China, as a case study, this research combined the flood source tracking method with the hydrodynamic model LISFLOOD-FP to identify the inundation area and its sources. Additionally, this study analyzed spatial hydrological connectivity was also analyzed in. The spatial prioritization was classified based on four intervention criteria: (Criterion 1) flooding extent; (Criterion 2) maximum inundation depth; (Criterion 3) flooding road network; (Criterion 4) flood exposure to buildings. Furthermore, the prioritization results of various combinations of criteria were also analyzed. Finally, the impact of rainfall intensity and grid cell size on the spatial prioritization was discussed. The results of this study emphasize the importance of spatial hydrological connectivity and flood sources. Various intervention criteria determine different spatial prioritization, highlighting the importance of developing multi-intervention criteria based on specific needs and objectives. The results indicated that sponge city pilot area in Jinan City has a high spatial prioritization. Rainfall intensity and grid cell size strongly influence the spatial prioritization, while these factors have little impact on their spatial distribution. This study demonstrates the novelty of combining intervention criteria and flood source tracking method and provides new perspectives and valuable references for urban flood mitigation.