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Analytical solution to the 3D tide-induced Lagrangian residual current in a narrow bay with vertically varying eddy viscosity coefficient

机译:具有垂直变化的涡流粘度系数的窄托架3D潮汐诱导拉格朗日剩余电流的分析解

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摘要

The 3D Lagrangian residual velocity (LRV) is solved analytically in a narrow bay employing a vertically varying eddy viscosity coefficient. The nondimensional vertical profile of the eddy viscosity is described by a parabola that is characterized by its minimum value and the location of its symmetry axis. The results show that the LRV has similar structures as that under constant eddy viscosity coefficient when the magnitude is the same. The tidal body force that drives the residual velocity contains two terms, the advection and Stokes' drift. The total LRV, as well as the LRV induced by each term, are very sensitive to the magnitude of the eddy viscosity coefficient, while the specific profile matters less. With a given magnitude, the specific profile of the varying eddy viscosity coefficient affects the total LRV by changing the LRV induced by the advection term. Moreover, the contribution mechanism of each component of the tidal body force to the total LRV is analyzed. The 3D LRV is mainly determined by the Stokes' drift stress term regardless of the steepness of the across-bay topography. The depth-integrated and breadth-averaged LRV are mainly determined by the Stokes' drift stress term with steep topography, but the Stokes' drift contribution is no longer obvious with gentle topography.
机译:3D拉格朗日剩余速度(LRV)在采用垂直变化的涡流系数的窄托架中分析求解。副粘度的非尺寸垂直轮廓由抛物线描述,其特征在于其最小值和对称轴的位置。结果表明,当幅度相同时,LRV具有与恒定涡流系数的结构类似的结构。驱动残余速度的潮汐体重包含两个术语,平流和斯托克斯的漂移。总LRV以及每个术语引起的LRV对涡粘度系数的大小非常敏感,而具体轮廓较少。通过给定的幅度,改变涡粘度系数的具体轮廓通过改变通过平流术语诱导的LRV来影响总LRV。此外,分析了潮汐体力的每个部件对总LRV的贡献机制。 3D LRV主要由Stokes的漂移应力术语决定,而不管穿越湾地形的陡度。深度集成和广度平均的LRV主要由Stokes的漂移应力术语与陡峭的地形决定,但斯托克斯的漂移贡献不再具有显而易见的地形。

著录项

  • 来源
    《Ocean Dynamics》 |2020年第6期|759-770|共12页
  • 作者单位

    Physical Oceanography Laboratory/CIMST Qingdao National Laboratory for Marine Science and Technology Ocean University of China Qingdao 266100 China;

    Department of Mathematics Changzhi University Changzhi 046000 Shanxi China;

    Physical Oceanography Laboratory/CIMST Qingdao National Laboratory for Marine Science and Technology Ocean University of China Qingdao 266100 China;

    Physical Oceanography Laboratory/CIMST Qingdao National Laboratory for Marine Science and Technology Ocean University of China Qingdao 266100 China Laboratory of Marine Environment and Ecology Ocean University of China 238 Songling Road Qingdao 266100 Shandong Province China;

    Physical Oceanography Laboratory/CIMST Qingdao National Laboratory for Marine Science and Technology Ocean University of China Qingdao 266100 China Laboratory of Marine Environment and Ecology Ocean University of China 238 Songling Road Qingdao 266100 Shandong Province China;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Lagrangian residual current; Vertically varying eddy viscosity; Analytical solution; 3D;

    机译:拉格朗日剩余电流;垂直变化的涡流粘度;分析解决方案;3d;

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