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Analysis of Surface Runoff Characteristics in Zhengzhou City under Extreme Rainfall Conditions

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Listed:
  • Yong Wang

    (Institute of Geographical Sciences, Henan Academy of Sciences, Zhengzhou 450052, China)

  • Shuangquan Li

    (Institute of Geographical Sciences, Henan Academy of Sciences, Zhengzhou 450052, China)

  • Chanjuan Hu

    (Institute of Geographical Sciences, Henan Academy of Sciences, Zhengzhou 450052, China)

  • Jie Ren

    (Institute of Geographical Sciences, Henan Academy of Sciences, Zhengzhou 450052, China)

  • Peng Liu

    (Institute of Geographical Sciences, Henan Academy of Sciences, Zhengzhou 450052, China)

  • Chang Zhao

    (Institute of Geographical Sciences, Henan Academy of Sciences, Zhengzhou 450052, China)

  • Mengke Zhu

    (Institute of Geographical Sciences, Henan Academy of Sciences, Zhengzhou 450052, China)

Abstract

In recent years, global climate change has become more and more obvious, and extreme rainfall weather has occurred frequently, which has a serious impact on people’s life and property safety. In order to reduce the risk of urban flooding and contribute to the sustainable development of the urban economy, society, and environment, this study takes Zhengzhou City as the study area. The surface runoff during extreme rainfall events from 2005 to 2023 was simulated using the SCS-CN model, and the spatiotemporal patterns of surface runoff during extreme rainfall conditions and their influencing factors were investigated. The results showed that (1) the average annual extreme rainfall in the study area was 95.6 mm, and the average annual surface runoff was 76.5 mm, with cultivated land contributing the most to surface runoff, accounting for more than 50%. The annual average frequency of extreme rainfall in the study area ranged from 0 to 3 times. (2) During the extreme rainfall events in 2021 and 2023, the surface runoff of the main urban area was relatively great. Under the influence of impermeable surfaces, the surface runoff of the main urban area was greater than that of the surrounding area, even when the rainfall in the main urban area was less than that in the surrounding urban area. In addition, during these two extreme rainfall events, the surface runoff in the slight slope (<5°) area was the greatest; overall, the larger the slope was, the smaller the surface runoff. (3) Differences between rainfall and surface runoff (DRS) of the different administrative districts in the study area showed three trends from 2005 to 2020, with those of most areas showing a clear decreasing trend, which was affected mainly by the surface runoff potential of the land use type. Under the same rainfall conditions (110 mm), the surface runoff of urban land and construction land was 1.4–2.5 times that of various types of woodland and grassland. From 2005 to 2020, the area of urban land and other construction land increased by 104.13%, the coverage area of woodland and grassland decreased by 35.90%, and the surface runoff potential increased in most areas of the study area. To reduce the risk of urban waterlogging, most areas of Zhengzhou, especially the main urban area and slight slope areas, need to rationally regulate land use and increase the coverage ratio of woodland and grassland.

Suggested Citation

  • Yong Wang & Shuangquan Li & Chanjuan Hu & Jie Ren & Peng Liu & Chang Zhao & Mengke Zhu, 2024. "Analysis of Surface Runoff Characteristics in Zhengzhou City under Extreme Rainfall Conditions," Sustainability, MDPI, vol. 16(16), pages 1-14, August.
    • Handle: RePEc:gam:jsusta:v:16:y:2024:i:16:p:6980-:d:1456492
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    References listed on IDEAS

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    1. Glen P. Peters & Robbie M. Andrew & Tom Boden & Josep G. Canadell & Philippe Ciais & Corinne Le Quéré & Gregg Marland & Michael R. Raupach & Charlie Wilson, 2013. "The challenge to keep global warming below 2 °C," Nature Climate Change, Nature, vol. 3(1), pages 4-6, January.
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