Sediment Relocation in a Reservoir by Special Ejector Pump System

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  • 特殊エジェクター工法によるダム堆砂の湖内移動
  • トクシュ エジェクター コウホウ ニ ヨル ダムタイサ ノ ミズウミ ナイ イドウ

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Description

The special ejector pump system is able to pick up the sediment from the bottom of reservoir by means of the pressure gradient generated by jet water. In this system, the maximum expected size of gravel which can be transported is approximately 150 mm. The field tests on this newly developed system was very successful as approximately 3,500 m3 sediment was dredged by special ejector pump from different depths in the reservoir, 3 to 15 m deep; and then the sediment relocated to the disposal site, 400 m upstream from the suction point, by floating transportation pipeline. The sediment transportation rate was equal to approximately 70 m3/h.

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