SUNZhuo,SHAOZhi-yu,ZHANZi-yi,et al.Development of Refined Hydraulic Model for Urban Complex Micro-topographies under Extreme Rainfall Conditions[J].China Water & Wastewater,2025,41(23):156-162.
Development of Refined Hydraulic Model for Urban Complex Micro-topographies under Extreme Rainfall Conditions
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第41卷
Number:
第23期
Page:
156-162
Column:
Date of publication:
2025-12-01
- Keywords:
- urban drainage; flood model; storm water management model (SWMM); extreme rainfall; micro-topography
- Abstract:
- Extreme rainfall refers to precipitation events where both the intensity and total amount exceed the drainage capacity of the existing urban rainwater system. Under such conditions, a significant volume of rainwater overflows onto the surface, leading to waterlogging in micro-topographic depressions such as urban underpasses and low-lying roads, thereby posing a risk to the safe and efficient operation of urban infrastructure. Due to the complexity of confluence patterns, the superposition of flow rates, and dynamic variations in system boundary conditions, accurate simulation of underpasses and low-lying roads during excessive rainfall events becomes increasingly challenging, thereby impacting the prediction and early warning capabilities for urban flooding risks. This study selected two common micro-topographies, namely urban underpasses and low-lying roads, to examine the construction components and generalization approaches for developing refined hydraulic models under conditions of extreme rainfall. Furthermore, adaptive strategies, including dual drainage systems and water storage facilities, were evaluated using storm water management model (SWMM). The proposed method for constructing a refined urban flooding model was evaluated through the replication and validation of historical rainfall events, enabling a comprehensive analysis of the underlying causes of urban flooding. This refined flood modeling framework integrated multiple critical hydraulic components, enabling a dynamic simulation of the complete urban stormwater cycle including runoff generation, accumulation, storage, and drainage within complex micro-topographical environments under extreme rainfall conditions. The model accurately captures the influence of localized features such as drainage inlet bottlenecks, backwater flooding, and malfunctioning pumping stations on urban flooding, thereby providing a robust foundation for developing targeted flood mitigation strategies and high-precision flood risk early warning systems.
Last Update:
2025-12-01