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An Enhanced Physically Based Scour Model for Considering Jet Air Entrainment

Duarte, Rafael ; Pinheiro, António ; Schleiss, Anton J.

Engineering (Beijing, China), 2016-09, Vol.2 (3), p.294-301 [Peer Reviewed Journal]

Elsevier Ltd

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  • Title:
    An Enhanced Physically Based Scour Model for Considering Jet Air Entrainment
  • Author: Duarte, Rafael ; Pinheiro, António ; Schleiss, Anton J.
  • Subjects: Air entrainment ; Block stability ; Dam safety ; High-velocity jets ; Rock scour ; Scour assessment ; Uplift ; 冲击作用 ; 冲刷模型 ; 喷射 ; 块体稳定性 ; 射流曝气 ; 物理 ; 空气夹带 ; 高速射流
  • Is Part Of: Engineering (Beijing, China), 2016-09, Vol.2 (3), p.294-301
  • Notes: Based on systematic experiments on the influence of air entrainment on rock block stability in plunge pools impacted by high-velocity jets, this study presents adaptations of a physically based scour model. The modifications regarding jet aeration are implemented in the Comprehensive Scour Model （CSM）, allowing it to reproduce the physical-mechanical processes involved in scour formation concerning the three phases; namely, water, rock, and air. The enhanced method considers the reduction of momentum of an aerated jet as well as the decrease of energy dissipation in the jet diffusive shear layer, both result- ing from the entrainment of air bubbles. Block ejection from the rock mass depends on a combination of the aerated time-averaged pressure coefficient and the modified maximum dynamic impulsion coef- ficient, which was found to be a constant value of 0.2 for high-velocity jets in deep pools. The modified model is applied to the case of the observed scour hole at the Kariba Dam, with good agreement.
    10-1244/N
    Air entrainmentUpliftRock scourDam safetyHigh-velocity jetsBlock stabilityScour assessment
  • Description: Based on systematic experiments on the influence of air entrainment on rock block stability in plunge pools impacted by high-velocity jets, this study presents adaptations of a physically based scour model. The modifications regarding jet aeration are implemented in the Comprehensive Scour Model （CSM）, allowing it to reproduce the physical-mechanical processes involved in scour formation concerning the three phases; namely, water, rock, and air. The enhanced method considers the reduction of momentum of an aerated jet as well as the decrease of energy dissipation in the jet diffusive shear layer, both result- ing from the entrainment of air bubbles. Block ejection from the rock mass depends on a combination of the aerated time-averaged pressure coefficient and the modified maximum dynamic impulsion coef- ficient, which was found to be a constant value of 0.2 for high-velocity jets in deep pools. The modified model is applied to the case of the observed scour hole at the Kariba Dam, with good agreement.
  • Publisher: Elsevier Ltd
  • Language: English
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