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Impact of Paddy Field Reservoirs on Flood Management in a Large River Basin of Japan

Author

Listed:
  • Debanjali Saha

    (Institute of Industrial Science, The University of Tokyo, Tokyo 153-8505, Japan)

  • Kazuo Oki

    (Institute of Industrial Science, The University of Tokyo, Tokyo 153-8505, Japan
    Faculty of Engineering, Kyoto University of Advanced Science, Kyoto 615-0096, Japan)

  • Koshi Yoshida

    (Graduate School of Frontier Sciences, The University of Tokyo, Tokyo 277-0882, Japan)

  • Naota Hanasaki

    (Center for Climate Change Adaptation, National Institute for Environmental Studies, Tsukuba 305-8506, Japan)

  • Hideaki Kamiya

    (Institute of Industrial Science, The University of Tokyo, Tokyo 153-8505, Japan)

Abstract

The flood retention capacity of paddy fields is well-recognized in Japan, and all the existing flood control practices via paddy field management achieve reductions in peak flood discharge. However, the previous studies have not assessed the flood management potential of paddy fields in a large river basin with average paddy coverage, and the existing hydrological models are not quite suitable for simulating river discharge from closed-drainage paddy reservoir storage. We herein attempt to improve the watershed-scale version of global hydrological model H08 to simulate a reduction in the peak discharge from paddy reservoirs in the Abukuma River basin of Japan. The NSE and R 2 index showed fair reliability of the H08 model during the calibration and validation stages. The simulated results from the improved model show 11% and 6% peak reductions in high paddy coverage areas for a normal year (2018) and a major typhoon year (2019), respectively. The peak-reduction percentage increased with decreasing rainfall, depending on the overflow from the paddy reservoirs. The results indicate that the paddy reservoir is not highly effective in a large river with less than 20% paddy coverage, but the peak discharge reduction capacity shows that paddy reservoirs can make some contribution when used in combination with dam operation.

Suggested Citation

  • Debanjali Saha & Kazuo Oki & Koshi Yoshida & Naota Hanasaki & Hideaki Kamiya, 2023. "Impact of Paddy Field Reservoirs on Flood Management in a Large River Basin of Japan," Sustainability, MDPI, vol. 15(8), pages 1-21, April.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:8:p:6604-:d:1122775
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    References listed on IDEAS

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    1. Ryota Tsuchiya & Tasuku Kato & Jaehak Jeong & Jeffrey G. Arnold, 2018. "Development of SWAT-Paddy for Simulating Lowland Paddy Fields," Sustainability, MDPI, vol. 10(9), pages 1-19, September.
    2. Juan Fan & Guangwei Huang, 2020. "Evaluation of Flood Risk Management in Japan through a Recent Case," Sustainability, MDPI, vol. 12(13), pages 1-17, July.
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