Abstract:Against the backdrop of global climate change and high-intensity urbanization, the urban flood safety has become a critical bottleneck restricting the sustainable development of megacities. Based on the policy context of integrating flood safety assessment into the statutory planning management system in Guangzhou, taking the north area in the core zone of South Guangzhou Railway Station as an example, the technical path and implementation mechanism of scientifically integrating flood safety assessment in the control detailed planning stage are systematically discussed. By comprehensively applying the Infoworks ICM hydro-hydrodynamic model and GIS spatial analysis technology, a refined identification of the risk of urban flooding under the scenario of a once-in-a-century rainfall is conducted and the flooding risk level of the area is assessed. Combined with the relative policy requirements of Guangzhou, a result output system with "two diagrams and one table" as the core carriers has been constructed. The results indicate that the flood safety level in the study area is classified as low risk. The urban waterlogging prevention standard reaches a once-in-a-century level. The regional annual total runoff control rate is not less than 68.6%. And the scale of key facilities has been clearly defined and incorporated into regulatory planning indicators. Based on this research, a mechanism for the transformation and transmission of assessment results to planning elements such as flood drainage facilities, plot indicators, and storage and regulation spaces has been formed, providing a replicable and scalable technical model for promoting the shift of flood risk prevention and control from passive governance at the end to active regulation at the source.
