177 / 2024-02-26 19:39:06

Comprehensive flood risk assessment of urban flooding based on the 1D/2D coupled hydrodynamic model

urban flooding, hydrodynamic model, flood risk assessment

Due to the high population density and economic property in urban environments, urban flooding can result in substantial economic losses. The intricate nature of the process and the affected entities in urban flood disasters present significant challenges for accurate flood risk assessment. To address this pressing need, we proposed a comprehensive urban flood risk assessment method that evaluates the flood risk of primary affected entities including residents life, ground buildings, and underground spaces. The proposed assessment method is based on both scenario analysis and the index system method. Firstly, it predicts the disaster-causing hydraulic characteristics, including water depth, flow velocity, and building inundation, using a high-performance 1D/2D coupled urban flood hydrodynamic model. Then, it evaluates the flood risk of disaster-affected objects such as people, ground buildings, and underground spaces based on hazard, vulnerability, and exposure indices. The established comprehensive urban flood risk assessment method was successfully applied to a highly developed urban area in Wuhan City, China. To address the challenge of data acquisition, web crawling was employed to gather information on industrial distribution, property prices, and shop rents to support flood risk analysis. The flood process and corresponding risk degrees of primary affected objects under different rainfall return period scenarios were comprehensively evaluated. The established model can provide disaster prevention and reduction technology references for other cities threatened by urban flood disasters.