Dam Break Accident and Resulting Sediment Management at Downstream Dams in Lao PDR —Highly Turbid Flood-flow and Sediment Flushing at Nan Ngiep 1 Hydropower Project—

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  • AOSAKA Yushi
    ナムニアップ1パワーカンパニー 技術課
  • TABUCHI Takahisa
    ナムニアップ1パワーカンパニー 技術課
  • MURAKAMI Yoshikane
    関西電力（株） 水力事業本部 水力エンジニアリングセンター 海外水力グループ 開発課
  • TSUTSUI Shoji
    関西電力（株） 水力事業本部 水力部

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  • ラオス国ナムニアップ1水力発電プロジェクトにおける上流プロジェクトのダム破堤に伴う影響について
  • ラオスコク ナムニアップ 1 スイリョク ハツデン プロジェクト ニ オケル ジョウリュウ プロジェクト ノ ダムハテイ ニ トモナウ エイキョウ ニ ツイテ

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Abstract

<p>In September 2017, A Dam under construction in Laos, which is located 90 km upstream of the Nam Nigep 1 Hydropower Project (NNP1), was breached, and around 500,000 m3 water in the reservoir under impounding was flown to the downstream river course. The highly turbid water impacted on the ecology of the downstream river course and around 700,000 m3 sediment consisting of clay and silt was accumulated in the re-regulation dam reservoir of the NNP1, which has just completed at that time. It was feared that when the NNP1 starts the initial impounding of the main dam reservoir which is located upstream of the re-regulation dam while we'll keep environmental flow during the impounding, the anaerobic deteriorated clay and silt are expected to be released with the environmental flow and may impact on the ecology of downstream river course. In order to mitigate this harmful impact, the NNP1 decided to implement sediment flushing in early dry season of 2017, when the NNP1 River has a certain volume of the flow, before starting the initial impounding to be scheduled in May 2018. This paper presents the dam break impact on the downstream river course and resultant sediment management at the downstream NNP1 dam.</p>

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