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Research on the Critical Rainfall of Flash Floods in Small Watersheds Based on the Design of Characteristic Rainfall Patterns

Author

Listed:
  • Wenlin Yuan

    (Zhengzhou University)

  • Xinyu Tu

    (Zhengzhou University)

  • Chengguo Su

    (Zhengzhou University)

  • Meiqi Liu

    (Zhengzhou University)

  • Denghua Yan

    (Zhengzhou University
    Department of Water Resources, China Institute of Water Resources and Hydropower Research)

  • Zening Wu

    (Zhengzhou University)

Abstract

Rainfall is one of the main causes of flash floods in mountainous watersheds. The critical rainfall, calculated by the rainfall patterns which represent typical rainfall processes, is an important index for the early warning of flash floods. However, due to the randomness and diversity of the rainfall process, the traditional single rainfall pattern is inconsistent with the actual diversified rainfall process, which brings great challenges to the early warning of flash floods. This paper proposes three characteristic parameters to describe the temporal distribution characteristics of typical rainfall processes. On this basis, the appropriate cumulative distribution functions (CDFs) are chosen to fit the cumulative rainfall-duration curves corresponding to typical rainfall processes, and the probability density functions (PDFs) can be used to represent the characteristic rainfall patterns. The HEC-HMS hydrological model is then used to simulate the rainfall-runoff process, and the critical rainfall corresponding to different characteristic rainfall patterns is calculated with a trial algorithm. The results demonstrate that: (1) the critical rainfall calculated by the designed characteristic rainfall patterns is more accurate than that calculated by the traditional rainfall pattern (TRP), proving that the design method of characteristic rainfall patterns proposed in this paper could increase the accuracy of early warning of flash floods in small watersheds. (2) The effects of the antecedent soil moisture condition (ASMC) and rainfall pattern on the critical rainfall are analyzed, which provides a valuable reference for the analysis and calculation of the critical rainfall of flash floods in small watersheds.

Suggested Citation

  • Wenlin Yuan & Xinyu Tu & Chengguo Su & Meiqi Liu & Denghua Yan & Zening Wu, 2021. "Research on the Critical Rainfall of Flash Floods in Small Watersheds Based on the Design of Characteristic Rainfall Patterns," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 35(10), pages 3297-3319, August.
    • Handle: RePEc:spr:waterr:v:35:y:2021:i:10:d:10.1007_s11269-021-02893-5
    DOI: 10.1007/s11269-021-02893-5
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    References listed on IDEAS

    as
    1. Xiaoyan Zhai & Liang Guo & Ronghua Liu & Yongyong Zhang, 2018. "Rainfall threshold determination for flash flood warning in mountainous catchments with consideration of antecedent soil moisture and rainfall pattern," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 94(2), pages 605-625, November.
    2. Wenlin Yuan & Lei Fu & Qianyu Gao & Fang Wan, 2019. "Comprehensive Assessment and Rechecking of Rainfall Threshold for Flash Floods Based on the Disaster Information," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 33(10), pages 3547-3562, August.
    3. Longfei Han & Youpeng Xu & Guangbo Pan & Xiaojun Deng & Chunsheng Hu & Hongliang Xu & Hongyi Shi, 2015. "Changing properties of precipitation extremes in the urban areas, Yangtze River Delta, China, during 1957–2013," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 79(1), pages 437-454, October.
    4. Xiaoyan Zhai & Liang Guo & Ronghua Liu & Yongyong Zhang & Yongqiang Zhang, 2021. "Comparing Three Hydrological Models for Flash Flood Simulations in 13 Humid and Semi-humid Mountainous Catchments," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 35(5), pages 1547-1571, March.
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    Cited by:

    1. Guangzhao Chen & Jingming Hou & Yuan Hu & Tian Wang & Shaoxiong Yang & Xujun Gao, 2023. "Simulated Investigation on the Impact of Spatial–temporal Variability of Rainstorms on Flash Flood Discharge Process in Small Watershed," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 37(3), pages 995-1011, February.

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