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Scale-Dependent Dispersion within the Stratified Interior on the Shelf of Northern Monterey Bay

机译:北部蒙特雷湾货架上分层内部的尺度相关色散

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摘要

Autonomous underwater vehicle measurements are used to quantify lateral dispersion of a continuously released Rhodamine WT dye plume within the stratified interior of shelf waters in northern Monterey Bay, California. The along-shelf evolution of the plume's cross-shelf (lateral) width provides evidence for scale-dependent dispersion following the 4/3 law, as previously observed in both surface and bottom layers. The lateral dispersion coefficient is observed to grow to 0.5 m~2 s~(-1) at a distance of 700 m downstream of the dye source. The role of shear and associated intermittent turbulent mixing within the stratified interior is investigated as a driving mechanism for lateral dispersion. Using measurements of time-varying temperature and horizontal velocities, both an analytical shear-flow dispersion model and a particle-tracking model generate estimates of the lateral dispersion that agree with the field-measured 4/3 law of dispersion, without explicit appeal to any assumed turbulence structure.
机译:自主水下航行器测量用于量化加利福尼亚州蒙特雷湾北部架子水分层内部内部连续释放的若丹明WT染料羽流的横向分散。如先前在表层和底层中所观察到的那样,羽流的跨架(横向)宽度的沿架演化是遵循4/3定律的比例依赖分散的证据。观察到横向色散系数在染料源下游700 m处增长到0.5 m〜2 s〜(-1)。研究了层状内部内部剪切和相关的间歇性湍流混合的作用,作为横向分散的驱动机制。通过使用随时间变化的温度和水平速度的测量,分析剪切流弥散模型和颗粒跟踪模型均会产生横向弥散的估计值,这些估计值与现场测量的弥散定律4/3一致,而对任何形式都没有明确的吸引力假定的湍流结构。

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  • 来源
    《Journal of Physical Oceanography》 |2014年第4期|1049-1064|共16页
  • 作者单位

    Environmental Fluid Mechanics Laboratory, Department of Civil and Environmental Engineering, Stanford University, Y2E2 473 Via Ortega, Stanford, CA 94305;

    Environmental Fluid Mechanics Laboratory, Department of Civil and Environmental Engineering, Stanford University, Stanford, California;

    COBIA Lab, College of Engineering, The University of Georgia, Athens, Georgia;

    Department of Civil and Environmental Engineering, University of California, Berkeley, Berkeley, California;

    Department of Civil and Environmental Engineering, University of California, Berkeley, Berkeley, California;

    Environmental Fluid Mechanics Laboratory, Department of Civil and Environmental Engineering, Stanford University, Stanford, California;

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