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<p>Turbidity currents are the main process for the transport and deposit of sediments in reservoir, especially in the deepest parts near the dam, where the vital structures are located. This experimental study investigates the effect of an impermeable obstacle located at a bed slope break on the regulation of reservoir turbidity currents. The experiments are performed under different conditions of the entrance concentration and the obstacle height. Results show that the obstacle reduces the depth-averaged velocity of the turbidity current downstream of the obstacle by approximately 20–50%. Likewise, the turbidity current discharge per-unit channel width decreases about 20–60%, and the turbidity current sediment discharge drops about 15–60% well by increasing the obstacle height. Also results indicate that the position and height of the obstacle have been very effective in the sedimentation pattern. The efficiency of the obstacle in controlling the velocity, discharge, and also, the sediment discharge of the turbidity current in the subcritical current has been two folds more than the supercritical current.</p>

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Effect of obstacle placement on sediment trapping in turbidity currents at bed‑slope breaks: a comparative analysis of subcritical and supercritical flow regimes

  • 期刊论文

  • 发表日期：

    2026年6月28日

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  • Shiva Keshtkar,
  • Mohammad Hadi Fattahi

摘要

Turbidity currents are the main process for the transport and deposit of sediments in reservoir, especially in the deepest parts near the dam, where the vital structures are located. This experimental study investigates the effect of an impermeable obstacle located at a bed slope break on the regulation of reservoir turbidity currents. The experiments are performed under different conditions of the entrance concentration and the obstacle height. Results show that the obstacle reduces the depth-averaged velocity of the turbidity current downstream of the obstacle by approximately 20–50%. Likewise, the turbidity current discharge per-unit channel width decreases about 20–60%, and the turbidity current sediment discharge drops about 15–60% well by increasing the obstacle height. Also results indicate that the position and height of the obstacle have been very effective in the sedimentation pattern. The efficiency of the obstacle in controlling the velocity, discharge, and also, the sediment discharge of the turbidity current in the subcritical current has been two folds more than the supercritical current.