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A Two-Level Early Warning System on Urban Floods Caused by Rainstorm

Author

Listed:
  • Qian Gu

    (China Institute of Water Resources and Hydropower Research, Beijing 100038, China)

  • Fuxin Chai

    (China Institute of Water Resources and Hydropower Research, Beijing 100038, China
    Research Center on Flood & Drought Disaster Reduction of the Ministry of Water Resources, Beijing 100038, China
    Key Laboratory of Water Safety for Beijing-Tianjin-Hebei Region of Ministry of Water Resources, Beijing 100038, China)

  • Wenbin Zang

    (China Institute of Water Resources and Hydropower Research, Beijing 100038, China
    Research Center on Flood & Drought Disaster Reduction of the Ministry of Water Resources, Beijing 100038, China)

  • Hongping Zhang

    (China Institute of Water Resources and Hydropower Research, Beijing 100038, China
    Research Center on Flood & Drought Disaster Reduction of the Ministry of Water Resources, Beijing 100038, China)

  • Xiaoli Hao

    (China Institute of Water Resources and Hydropower Research, Beijing 100038, China
    Research Center on Flood & Drought Disaster Reduction of the Ministry of Water Resources, Beijing 100038, China)

  • Huimin Xu

    (China Institute of Water Resources and Hydropower Research, Beijing 100038, China)

Abstract

In recent years, the combined effects of rapid urbanization and climate change have led to frequent floods in urban areas. Rainstorm flood risk warning systems play a crucial role in urban flood prevention and mitigation. However, there has been limited research in China on nationwide urban flood risk warning systems based on rainfall predictions. This study constructs a two-level early warning system (EWS) at the national and urban levels using a two-dimensional hydrological–hydrodynamic model considering infiltration and urban drainage standards. A methodology for urban rainstorm flood risk warnings is proposed, leveraging short-term and high-resolution rainfall forecast data to provide flood risk warnings for 231 cities in central and eastern China. Taking Beijing as an example, a refined rainstorm flood warning technique targeting city, district, and street scales is developed. We validated the methodology with monitoring data from the “7.31” rainstorm event in 2023 in Beijing, demonstrating its applicability. It is expected that the findings of this study will serve as a valuable reference for the urban rainstorm flood risk warning system in China.

Suggested Citation

  • Qian Gu & Fuxin Chai & Wenbin Zang & Hongping Zhang & Xiaoli Hao & Huimin Xu, 2025. "A Two-Level Early Warning System on Urban Floods Caused by Rainstorm," Sustainability, MDPI, vol. 17(5), pages 1-16, March.
    • Handle: RePEc:gam:jsusta:v:17:y:2025:i:5:p:2147-:d:1603626
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    References listed on IDEAS

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