Estimation of paddy field dam effect on flood mitigation focusing on Suse region of Hyogo, Japan

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  • Kobayashi Kenichiro
    Research Center for Urban Safety and Security, Kobe University, Japan Department of Civil Engineering, Graduate School of Engineering, Kobe University, Japan
  • Kono Yasunori
    Department of Civil Engineering, Graduate School of Engineering, Kobe University, Japan
  • Kimura Takao
    Organization for Making a Beautiful Suse Village, Japan
  • Tanakamaru Haruya
    Graduate School of Agricultural Science, Kobe University, Japan

抄録

<p>Recently, Hyogo Prefecture in Japan has expanded its paddy field dam activity within the prefecture using wood weir plates. A wood weir plate was placed at the drainage outlet of a paddy field to limit drainage from the field, thus enabling the paddy fields to store rainwater to a certain extent. As the effect on flood mitigation was not appropriately estimated, we carried out a field experiment using a wood weir plate to estimate the weir coefficient, which determines the drainage discharge from the paddy according to the water depth. Then, using the estimated weir coefficient, we developed a 3,000 m2 paddy field dam model. Thereafter, we applied the model to the Suse region (approximately 33 ha) considering the 2009 and 2011 rainfall events. It was observed that the paddy field dam has a relatively large effect on reducing the peak discharge (approximately 25.2% for 2009 and 48.5% for 2011) within the proximal downstream areas of the paddy dam site. However, the simulation showed that when the rainfall is extreme, as was the case in 2009, the paddy dam activity may cause erosion of the paddy levee due to the increase in the paddy water depth.</p>

収録刊行物

  • Hydrological Research Letters

    Hydrological Research Letters 15 (3), 64-70, 2021

    水文・水資源学会／日本地下水学会／日本水文科学会／陸水物理研究会

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