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首页> 外文期刊>Journal of Physical Oceanography >Impact of the Depth-to-Width Ratio of Periodically Stratified Tidal Channels on the Estuarine Circulation
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Impact of the Depth-to-Width Ratio of Periodically Stratified Tidal Channels on the Estuarine Circulation

机译：周期性分层潮汐通道的宽宽比对河口环流的影响

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摘要

The dependency of the estuarine circulation on the depth-to-width ratio of a periodically, weakly stratified tidal estuary is systematically investigated here for the first time. Currents, salinity, and other properties are simulated by means of the General Estuarine Transport Model (GETM) in cross-sectional slice mode, applying a symmetric Gaussian-shaped depth profile. The width is varied over four orders of magnitude. The individual along-channel circulation contributions from tidal straining, gravitation, advection, etc., are calculated and the impact of the depth-to-width ratio on their intensity is presented and elucidated. It is found that the estuarine circulation exhibits a distinct maximum in medium-wide channels (intermediate depth-to-width ratio depending on various parameters), which is caused by a maximum of the tidal straining contribution. This maximum is related to a strong tidal asymmetry of eddy viscosity and shear created by secondary strain-induced periodic stratification (2SIPS): in medium channels, transverse circulation generated by lateral density gradients due to laterally differential longitudinal advection induces stable stratification at the end of the flood phase, which is further increased during ebb by longitudinal straining (SIPS). Thus, eddy viscosity is low and shear is strong in the entire ebb phase. During flood, SIPS decreases the stratification so that eddy viscosity is high and shear is weak. The circulation resulting from this viscosity-shear correlation, the tidal straining circulation, is oriented like the classical, gravitational circulation, with riverine outflow at the surface and oceanic inflow close to the bottom. In medium channels, it is about 5 times as strong as in wide (quasi one-dimensional) channels, in which 2SIPS is negligible.
机译：本文首次系统地研究了河口环流对周期性，弱分层潮汐河口深宽比的依赖性。电流，盐度和其他属性通过通用河口运输模型（GETM）在横截面切片模式下进行模拟，并应用对称的高斯形状的深度剖面。宽度在四个数量级上变化。计算了潮汐应变，引力，对流等引起的各个通道沿流环流的贡献，并提出并阐明了深宽比对其强度的影响。发现河口环流在中宽通道中表现出明显的最大值（中间深宽比取决于各种参数），这是由潮汐应变贡献的最大值引起的。该最大值与次级应变诱导的周期性分层（2SIPS）产生的强烈的涡流粘度和剪切力的潮汐不对称有关：在中等通道中，由于横向差分纵向对流而产生的侧向密度梯度所产生的横向循环在底端引起了稳定的分层。洪水期，在潮汐期间由于纵向应变（SIPS）而进一步增加。因此，在整个退潮阶段，涡流粘度低，剪切力强。洪水期间，SIPS降低了分层，因此涡流粘度高而剪切力弱。由这种粘度-剪切相关性产生的循环，即潮汐应变循环，其方向类似于经典的重力循环，地表河流流出，而海洋流向底部。在中等信道中，其强度大约是2SIPS可以忽略的宽（准一维）信道的5倍。

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  • 来源
    《Journal of Physical Oceanography》 |2015年第8期|2048-2069|共22页
  • 作者

    Schulz Elisabeth; Schuttelaars Henk M.; Graewe Ulf; Burchard Hans;

  • 作者单位

    Leibniz Inst Baltic Sea Res Warnemunde, D-18119 Rostock, Germany;

    Delft Univ Technol, Delft Inst Appl Math, Delft, Netherlands;

    Leibniz Inst Baltic Sea Res Warnemunde, D-18119 Rostock, Germany;

    Leibniz Inst Baltic Sea Res Warnemunde, D-18119 Rostock, Germany;

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