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Sediment-induced buoyancy destruction and drag reduction in estuaries

机译：沉积物引起的浮力破坏和河口减阻

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摘要

This paper presents an analysis of drag reduction by buoyancy destruction in sediment-laden open channel flow. We start from the log-linear profile proposed by Barenblatt (Prikladnaja Matematika i Mekhanika, 17:261- 274, 1953), extended with a second length scale to account for free surface effects. Upon analytical integration over the water depth, an expression for sediment-induced drag reduction is found in terms of an effective Chezy number, water depth, bulk Richardson number, and Rouse number. This relation contains one empirical/experimental coefficient, which was obtained from a large series of numerical experiments with a idv point model. Upon calibration of this model against field and laboratory observations, we tuned the turbulent Prandtl-Schmidt number and found an optimal value of σ_T=2, consistent to observations by Cellino and Graf (ASCE, J Hydraulic Engineering, 125:456-462, 1999). All numerical results could be correlated with thernsimple relation C_(eff) = C_0 + 4 g~(1/2)hRi_*β, which is valid for fine sediment suspensions under conditions typical in open channel flow.
机译：本文对含泥沙明渠流中浮力破坏引起的减阻作用进行了分析。我们从Barenblatt（Prikladnaja Matematika i Mekhanika，17：261-274，1953）提出的对数线性轮廓开始，并扩展了第二个长度比例以说明自由表面效应。在对水深进行分析积分后，发现了由有效切兹数，水深，体理查森数和罗兹数表示的沉积物诱导的减阻作用。该关系包含一个经验/实验系数，该系数是通过使用idv点模型进行的一系列数值实验获得的。根据现场和实验室观察结果对该模型进行校准后，我们​​调整了湍流的Prandtl-Schmidt数，发现了σ_T= 2的最佳值，与Cellino和Graf的观察结果一致（ASCE，J Hydraulic Engineering，125：456-462，1999 ）。所有数值结果都可以与简单关系C_（eff）= C_0 + 4 g〜（1/2）hRi_ *β相关联，这对于明渠水流中典型的细颗粒悬浮物是有效的。

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  • 来源
    《Ocean Dynamics》 |2009年第5期|781-791|共11页
  • 作者

    Johan C. Winterwerp; Marieke Lely; Qing He;

  • 作者单位

    Environmental Fluid Mechanics, Delft University of Technology, P.O. Box 5048, 2600 GA Delft, The Netherlands Deltares (formerly WL|Delft Hydraulics), P.O. Box 177, 2600 MH Delft, The Netherlands;

    Environmental Fluid Mechanics, Delft University of Technology, P.O. Box 5048, 2600 GA Delft, The Netherlands;

    State Key Laboratory of Estuarine and Coastal Research, East China Normal University, No. 3663 Zhongshan Northern Road, Shanghai 200062, People's Republic of China;

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  • 正文语种 eng
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  • 关键词

    fine suspended sediment; buoyancy destruction; drag reduction; Yangtze;

    机译：细的悬浮沉积物;浮力破坏;减阻长江;

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