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Exploring the impact of urbanization on flood characteristics with the SCS-TRITON method

Author

Listed:
  • Hongjie Yu

    (Zhejiang University)

  • Yue-Ping Xu

    (Zhejiang University)

  • Hua Zhong

    (Nanjing Hydraulic Research Institute)

  • Yen-Ming Chiang

    (Zhejiang University)

  • Li Liu

    (Zhejiang University)

Abstract

Urbanization is one of the main factors altering hydrological processes. To understand the influence of urbanization on flood characteristics including runoff, inundation and streamflow, it is essential to quantify the level of urbanization and analyze the corresponding impacts on flood. This study proposed an integrated and systematic framework to assess how urbanization affects flood characteristics in Hangzhou, China. Land use changes in 2000–2020 representing the level of urbanization were extracted from Landsat images with an ensemble machine learning method and future scenarios were designed with Patch-generating Land Use Simulation (PLUS). The runoff, inundation and streamflow under 24 h design rainfall with 100 year return period were assessed using the integrated hydrologic-hydraulic model for land use of different years. Finally, the relationship between land use changes and flood characteristics were identified and analyzed. It was found that the study area underwent a rapid urbanization process with artificial surface increasing from 6.93% to 29.12% during 2000–2020. Total runoff volume and total inundation volume showed a growing trend with a percentage change of 5.96% and 12.33% respectively under the design rainfall. This study highlights the significance of water body area in influencing flood characteristics. The results of this study can improve understanding of flood responses to land use and provide useful insight to decision makers in developing urban flood management measures.

Suggested Citation

  • Hongjie Yu & Yue-Ping Xu & Hua Zhong & Yen-Ming Chiang & Li Liu, 2024. "Exploring the impact of urbanization on flood characteristics with the SCS-TRITON method," 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. 120(4), pages 3213-3238, March.
    • Handle: RePEc:spr:nathaz:v:120:y:2024:i:4:d:10.1007_s11069-023-06324-z
    DOI: 10.1007/s11069-023-06324-z
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    References listed on IDEAS

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    1. Wenchao Qi & Chao Ma & Hongshi Xu & Zifan Chen & Kai Zhao & Hao Han, 2021. "A review on applications of urban flood models in flood mitigation strategies," 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. 108(1), pages 31-62, August.
    2. Ismail Haltas & Gokmen Tayfur & Sebnem Elci, 2016. "Two-dimensional numerical modeling of flood wave propagation in an urban area due to Ürkmez dam-break, İzmir, Turkey," 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. 81(3), pages 2103-2119, April.
    3. Cohen, Barney, 2006. "Urbanization in developing countries: Current trends, future projections, and key challenges for sustainability," Technology in Society, Elsevier, vol. 28(1), pages 63-80.
    4. Jean Hounkpè & Bernd Diekkrüger & Abel A. Afouda & Luc Olivier Crepin Sintondji, 2019. "Land use change increases flood hazard: a multi-modelling approach to assess change in flood characteristics driven by socio-economic land use change scenarios," 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. 98(3), pages 1021-1050, September.
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