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首页> 外文期刊>Journal of Physical Oceanography >Dynamics of Three-Dimensional Turbulent Wall Plumes and Implications for Estimates of Submarine Glacier Melting
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Dynamics of Three-Dimensional Turbulent Wall Plumes and Implications for Estimates of Submarine Glacier Melting

机译：三维湍流壁羽动力学及其对海底冰川融化估计的意义

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摘要

Subglacial discharges have been observed to generate buoyant plumes along the ice face of Greenland tidewater glaciers. These plumes have been traditionally modeled using classical plume theory, and their characteristic parameters (e.g., velocity) are employed in the widely used three-equation melt parameterization. However, the applicability of plume theory for three-dimensional turbulent wall plumes is questionable because of the complex near-wall plume dynamics. In this study, corrections to the classical plume theory are introduced to account for the presence of a wall. In particular, the drag and entrainment coefficients are quantified for a three-dimensional turbulent wall plume using data from direct numerical simulations. The drag coefficient is found to be an order of magnitude larger than that for a boundary layer flow over a flat plate at a similar Reynolds number. This result suggests a significant increase in the melting estimates by the current parameterization. However, the volume flux in a wall plume is found to be one-half that of a conical plume that has 2 times the buoyancy flux. This finding suggests that the total entrainment (per unit area) of ambient water is the same and that the plume scalar characteristics (i.e., temperature and salinity) can be predicted reasonably well using classical plume theory.
机译：据观察，冰川下的排放物沿格陵兰岛潮水冰川的冰面产生浮羽。传统上使用经典羽流理论对这些羽流进行建模，并且在广泛使用的三方程式熔体参数化中采用了它们的特征参数（例如速度）。然而，由于复杂的近壁羽流动力学，羽流理论在三维湍流壁羽中的适用性值得怀疑。在这项研究中，引入了对经典羽流理论的更正，以说明墙的存在。特别地，使用来自直接数值模拟的数据来量化三维湍流壁羽的阻力系数和夹带系数。发现阻力系数比在相似雷诺数下在平板上流动的边界层的阻力系数大一个数量级。该结果表明，通过当前参数化，熔融估算值显着增加。但是，发现壁羽中的体积通量是具有浮力通量的2倍的圆锥形羽的一半。该发现表明环境水的总夹带量（每单位面积）是相同的，并且可以使用经典羽流理论合理地预测羽流标量特征（即温度和盐度）。

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  • 来源
    《Journal of Physical Oceanography》 |2018年第9期|1941-1950|共10页
  • 作者

    Ezhova Ekaterina; Cenedese Claudia; Brandt Luca;

  • 作者单位

    Univ Helsinki, Inst Atmospher & Earth Syst Res, Helsinki, Finland;

    Woods Hole Oceanog Inst, Dept Phys Oceanog, Woods Hole, MA 02543 USA;

    Royal Inst Technol, Linne FLOW Ctr, Stockholm, Sweden;

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