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Tidal dynamics on the North Patagonian Argentinean Gulfs

机译：北巴塔哥尼亚阿根廷湾的潮汐动力学

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摘要

Semidiurnal (M-2, S-2, N-2 and K-2), diurnal (K-1,O-1 and P-1) and quarter-diurnal (M-4, MN4 and MS4) barotropic tides over the North Patagonian Gulfs of Argentina: San Matas, (SMG), Nuevo (NG) and San Jose (SJG) are examined using a regional numerical model. Detailed comparison of computed elevations and currents with those obtained from harmonic analysis of few long-term observational records showed good agreement. A large amplification of all semidiurnal waves is recorded when they cross SMG mouth. Most of the tidal energy coming from the south at this frequency dissipates to the northeast of Valdes Peninsula, where the largest tidal currents are located. While M-2 currents (up to 2-2.5 m/s) are dominant, there are large S-2 and N-2 currents and locally intensified diurnal currents (5-10 cm/s) in some outer shelf locations. At difference with the semidiurnal and diurnal tides the higher harmonics M4, MS4 and MN4 develop a large amplification inside the NG. The model revealed a complex field of tidal residual currents. The intensity of such currents in some locations are of the same order of magnitude as those generated by winds or offshore forcing. We have identified three main patterns of residual circulation: regional coastal currents and gulf-wide gyres; inlet eddies and, topographic eddies. Vorticity balances and sensitivity experiments indicate that non-linear advection and bottom topography are the key mechanisms involved in the generation of these residual structures. (C) 2017 Elsevier Ltd. All rights reserved.
机译：半日（M-2，S-2，N-2和K-2），日（K-1，O-1和P-1）和四分之一日（M-4，MN4和MS4）正压潮。阿根廷北巴塔哥尼亚海湾：使用区域数值模型检查了San Matas（SMG），Nuevo（NG）和San Jose（SJG）。从一些长期观测记录的谐波分析中获得的高程和水流的计算结果进行了详细的比较，显示出很好的一致性。当它们穿过SMG口时，会记录所有半日波的大幅放大。来自南部的大多数潮汐能以该频率消散到最大潮汐流所在的瓦尔德斯半岛东北部。尽管M-2电流（高达2-2.5 m / s）占主导地位，但在某些外层架位置中存在大的S-2和N-2电流以及局部增强的昼夜电流（5-10 cm / s）。与半日潮和日潮不同，较高的谐波M4，MS4和MN4在NG内部产生较大的放大。该模型揭示了一个复杂的潮汐剩余流场。在某些位置，这种水流的强度与风力或海上强迫产生的水流强度大小相同。我们已经确定了剩余循环的三种主要模式：区域沿海水流和海湾宽环流；入口涡流和地形涡流。涡度平衡和灵敏度实验表明，非线性对流和底部地形是产生这些残余结构的关键机制。 （C）2017 Elsevier Ltd.保留所有权利。

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