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Urban Flood Risk Sustainable Management: Risk Analysis of Dam Break Induced Flash Floods in Mountainous Valley Cities

Author

Listed:
  • Yuanyuan Liu

    (State Key Laboratory of Water Cycle and Water Security, China Institute of Water Resources and Hydropower Research, Beijing 100038, China
    Key Laboratory of River Basin Digital Twinning of Ministry of Water Resources, Beijing 100038, China)

  • Yesen Liu

    (State Key Laboratory of Water Cycle and Water Security, China Institute of Water Resources and Hydropower Research, Beijing 100038, China
    Key Laboratory of River Basin Digital Twinning of Ministry of Water Resources, Beijing 100038, China)

  • Qian Yu

    (State Key Laboratory of Water Cycle and Water Security, China Institute of Water Resources and Hydropower Research, Beijing 100038, China
    Key Laboratory of River Basin Digital Twinning of Ministry of Water Resources, Beijing 100038, China)

  • Shu Liu

    (State Key Laboratory of Water Cycle and Water Security, China Institute of Water Resources and Hydropower Research, Beijing 100038, China)

Abstract

Small reservoirs in hilly areas serve as critical water conservancy infrastructure, playing an essential role in flood control, irrigation, and regional water security. However, dam-break events pose significant risks to downstream urban areas, threatening the sustainability and resilience of cities. This study takes Guangyuan City as a case study and employs numerical simulation methods—including dam-break modeling, hydrological modeling, and hydrodynamic modeling—to analyze the impact of dam-break floods on downstream urban regions. The results reveal that dam failure in small reservoirs can cause peak flood velocities exceeding 15 m/s, severely endangering urban infrastructure, ecosystems, and public safety. Additionally, for reservoirs with large catchment areas, dam-break floods combined with rainfall-induced flash floods may create compound disaster effects, intensifying urban flood risks. These findings underscore the importance of sustainable reservoir management and integrated flood risk strategies to enhance urban resilience and reduce disaster vulnerability. This research contributes to sustainable development by providing scientific insights and practical support for flood risk mitigation and resilient infrastructure planning in mountainous regions.

Suggested Citation

  • Yuanyuan Liu & Yesen Liu & Qian Yu & Shu Liu, 2025. "Urban Flood Risk Sustainable Management: Risk Analysis of Dam Break Induced Flash Floods in Mountainous Valley Cities," Sustainability, MDPI, vol. 17(13), pages 1-14, June.
    • Handle: RePEc:gam:jsusta:v:17:y:2025:i:13:p:5863-:d:1687562
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