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首页> 外文期刊>Journal of Physical Oceanography >A Porous-Medium Theory for Barotropic Flow through Ridges and Archipelagos
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A Porous-Medium Theory for Barotropic Flow through Ridges and Archipelagos

机译：穿过中脊和群岛的正压流的多孔介质理论

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摘要

A linear theory for the treatment of complex ridges and archipelagos as porous media is presented. The theory assumes a barotropic, wind-driven ocean with uniform depth. A porous ridge is formed by shrinking the meridional dimensions of the islands and straits (or gaps) composing a meridionally aligned island chain to infinitesimal values. The circulation integrals associated with a generalization of the "island rule" for each island then combine to form an ordinary differential equation. The solution determines the magnitude and structure of the zonal flow through the ridge. This solution could supply a boundary condition for numerical or inverse models that cannot resolve the topographic details of the ridge or archipelago. The physics of the throughflow is explored using a series of examples. It is shown that a concentrated zonal flow approaching the ridge from the east tends to spread meridionally before it passes through the ridge. If the spreading distance, which depends on the characteristics of the ridge, is small in comparison with the meridional scale of the zonal flow, the flow is unimpeded by the ridge. Otherwise the ridge may block or divert the flow. Paradoxically, ridges with high porosity are just as effective at blocking as are ridges with low porosity. The theoretical results are verified to a large extent by a barotropic numerical model.
机译：提出了处理复杂的山脊和群岛作为多孔介质的线性理论。该理论假设正压，风力驱动的海洋具有均匀的深度。通过将组成经线对齐的岛链的岛和海峡（或间隙）的经线尺寸缩小到无穷小，可以形成多孔脊。然后，将与每个岛的“岛屿法则”的概括相关联的环流积分组合起来，形成一个常微分方程。该解决方案确定了穿过脊的地带流的大小和结构。该解决方案可以为无法解析山脊或群岛的地形细节的数值模型或逆模型提供边界条件。使用一系列示例探索通流的物理原理。结果表明，一个集中的纬向流从东部流向山脊，在流经山脊之前，它会经向扩散。如果与脊状流的子午尺度相比，取决于脊的特征的扩展距离小，则该流不受脊的阻碍。否则，脊可能会阻塞或转移流量。矛盾的是，高孔隙率的脊与低孔隙率的脊一样有效。通过正压数值模型在很大程度上验证了理论结果。

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