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首页> 外文期刊>Journal of Physical Oceanography >Lateral Circulation Generates Flood Tide Stratification and Estuarine Exchange Flow in a Curved Tidal Inlet
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Lateral Circulation Generates Flood Tide Stratification and Estuarine Exchange Flow in a Curved Tidal Inlet

机译:横向循环在弯曲的潮汐进口处产生潮汐分层和河口交换水流

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摘要

Cross-channel transect measurements of microstructure and velocity in a well-mixed and curved tidal inlet in the German Wadden Sea show the occurrence of significant late flood stratification. This stratification is found to be a result of lateral straining. This study observes a strong single-cell lateral circulation, which is strongly pronounced at late flood and absent during most of ebb. This tidal asymmetry is caused by a systematic interplay between centrifugal forcing and the lateral baroclinic pressure gradient. During flood a positive feedback between the terms generates strong lateral circulation, whereas during ebb a negative feedback leads to a suppression of the cross-channel exchange. A theoretical framework based on vorticity is developed, which allows lateral and longitudinal circulation to be studied in a consistent way. With this framework it is possible to show that the tidal asymmetry of the lateral flow is a major driver of residual longitudinal estuarine circulation, here identified with the tidally averaged across-channel vorticity component.
机译:在德国瓦登海的一个混合良好且弯曲的潮汐进口中,对跨通道断面的微观结构和速度进行的测量表明,发生了明显的晚期洪水分层。发现这种分层是横向应变的结果。这项研究观察到强烈的单细胞侧向循环,这种现象在洪水泛滥时很明显,而在大多数退潮时则不存在。这种潮汐不对称性是由离心力和侧斜压梯度之间的系统性相互作用引起的。在洪水期间,各项之间的正反馈会产生强烈的横向循环,而在退潮期间,负反馈会导致跨渠道交换受到抑制。建立了基于涡度的理论框架,该框架允许以一致的方式研究横向和纵向环流。有了这个框架,就有可能表明横向流动的潮汐不对称性是残余纵向河口环流的主要驱动力,这里用潮汐平均跨通道涡度分量来确定。

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  • 来源
    《Journal of Physical Oceanography》 |2015年第3期|638-656|共19页
  • 作者单位

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

    Univ Calif Berkeley, Civil & Environm Engn Dept, Berkeley, CA 94720 USA;

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

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

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