APPLICABILITY OF METHOD FOR ESTIMATING EFFECTS OF SEDIMENT ROUTING IN HYDROPOWER DAM AND CHARACTERISTICS OF SEDIMENT TRANSPORTATION DUE TO LARGE-SCALE FLOODS

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  • MORIMOTO Koki
    電源開発株式会社 水力発電部 西日本支店
  • SUMI Tetsuya
    京都大学 防災研究所水資源環境研究センター

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Other Title
  • 発電用ダムの通砂運用効果推定手法の適用性と大規模出水における土砂動態特性の検討

Abstract

<p> Hydropower is important as a CO2-free energy source that can maintain stable output in the long run. On the other hand, reservoir sedimentation management is one of the most important issues in ensuring the sustainability of hydropower operation. As sedimentation management in hydropower dams, sediment sluicing operation has been introduced in some dams. However, sufficient knowledge for optimizing the operation has not been obtained. In this study, we summarize effects of sediment sluicing operation obtained so far at the Setoishi Dam, which has been conducted the operation in stages. we also study on the impact of the heavy rainfall in July 2020 that occurred during the oparation. In this paper, we discusse the ratio of flood water depths above river bed and spillway crest elevation, which is an index for easily estimating effects of the operation. we also elucidate reservoir sediment transportation due to the operetion including the heavy rain in July 2020 with numerical analysis and field data.</p>

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