Rotating Hydraulics and Upstream Basin Circulation
Rotating Hydraulics and Upstream Basin Circulation
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旋转水力学和上游盆地循环
DOI：
10.1175/2383.1
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发表时间：
2003
影响因子：
3.5
通讯作者：
L. Pratt
中科院分区：
文献类型：
--
作者：
K. Helfrich;L. Pratt
摘要利用单层（重力降低）浅水数值模型研究了通过海峡排水的源馈f平面盆地的水流，该模型求解了海峡内的水力流动。稳定的上游流域环流被认为是敏感的质量源（均匀下降流，局部下降流，或边界流入）的性质。相比之下，在海峡的水力控制流几乎是独立的盆地环流，并同意非常好的吉尔理论解使用海峡的几何形状和数值确定的平均位涡在海峡入口区。然而，这种吉尔解给出了一个与任何完整数值解不一致的上游边界层通量分裂的唯一值。耦合盆海峡系统选择一个平均溢流位涡对应的吉尔解决方案，最大流体深度的海峡边界。这种状态也对应于…
Abstract The flow in a source-fed f-plane basin drained through a strait is explored using a single-layer (reduced gravity) shallow-water numerical model that resolves the hydraulic flow within the strait. The steady upstream basin circulation is found to be sensitive to the nature of the mass source (uniform downwelling, localized downwelling, or boundary inflow). In contrast, the hydraulically controlled flow in the strait is nearly independent of the basin circulation and agrees very well with the Gill-theory solution obtained using the strait geometry and the numerically determined average potential vorticity in the strait entrance region. This Gill solution, however, gives a unique value of the upstream boundary layer flux splitting that does not agree with any of the full numerical solutions. The coupled basin–strait system is shown to select an average overflow potential vorticity corresponding to the Gill solution with maximum fluid depth on the strait boundaries. This state also corresponds to on...