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首页> 外文期刊>Journal of Physical Oceanography >Modeling of Bathymetry-Locked Residual Eddies in Well-Mixed Tidal Channels with Arbitrary Depth Variations
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Modeling of Bathymetry-Locked Residual Eddies in Well-Mixed Tidal Channels with Arbitrary Depth Variations

机译：具有任意深度变化的混合潮汐通道中的等深线锁定残留涡流建模

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摘要

The concept of the in-out-type exchange flow in estuaries only applies to situations with significant freshwater discharge and/or elongated channels with relatively simple variations in depth and coastline along the channel. In waterways with complex bottom topography, the in-out-type exchange flows may be replaced by residual eddies that are locked to bathymetry. This paper develops an analytic model for such tidally induced residual eddies. The model allows arbitrary depth variations in both along- and across-channel directions. The model produces residual eddies locked to bathymetry features, similar to observations in Wassaw Sound using a ship-mounted ADCP. Analysis indicates that for problems in a "short" channel with standing wave characteristics, the residual circulation is significantly influenced by advection. The frictional effect, however, is dominant and the wave propagation effect cannot be uniformly neglected (i.e., it sometimes can still compete or reinforce the effect of advection). The bathymetry function plays an important role in the generation of residual eddies. The wind during a half-dozen field observations does not appear to have significant effect to alter the structure of the flow field. Nor does the tidal range: the structures of the residual eddies do not change with the spring-neap tidal variation of tidal amplitude and remain robust in location. The persistent nature of these residual eddies makes it useful to map them in a specific area in a way similar to a coastal current. Although variabilities are anticipated in response to wind and coastal low-frequency sea level changes, the residual eddies will have significant implications to the flushing of a tidal channel, material transport, and the ecosystem dynamics.
机译：河口内进出式交换流的概念仅适用于淡水排放量大和/或河道细长，沿河道深度和海岸线变化相对简单的情况。在底部地形复杂的水道中，进出式交换流可能会被滞留在测深仪上的残留涡流所代替。本文为潮汐诱导的残余涡建立了解析模型。该模型允许沿通道方向和跨通道方向的任意深度变化。该模型产生锁定到测深仪特征的残留涡流，类似于使用船载ADCP在Wassaw Sound中的观测。分析表明，对于具有驻波特性的“短”通道中的问题，对流对残余循环的影响很大。然而，摩擦作用是主要的，并且波传播作用不能被均匀地忽略（即，有时它仍可以竞争或增强对流作用）。测深功能在产生残留涡流中起着重要作用。在进行六次野外观测时，风似乎对改变流场的结构没有显着影响。潮汐范围也没有：残余涡的结构不会随着潮汐振幅的弹簧跳动潮汐变化而改变，并且在位置上保持稳健。这些残留涡流的持久性使得以类似于沿海海流的方式将它们绘制在特定区域中很有用。尽管预计会随风和沿海低频海平面变化而变化，但残留涡流将对潮汐通道的冲刷，物质运输和生态系统动力学产生重大影响。

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  • 来源
    《Journal of Physical Oceanography》 |2006年第10期|p.1974-1993|共20页
  • 作者

    Chunyan Li;

  • 作者单位

    Coastal Studies Institute, Department of Oceanography and Coastal Sciences, School of the Coast and Environment, Louisiana State University, 3rd floor, Howe-Russell Geoscience Complex, Baton Rouge, LA 70803;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 海洋学;
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