Hydraulic control of zonal currents on a β-plane
Hydraulic control of zonal currents on a β-plane
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β 平面上纬向流的液压控制
DOI：
10.1017/s0022112089000972
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发表时间：
1989
影响因子：
3.7
通讯作者：
L. Armi
中科院分区：
文献类型：
--
作者：
L. Armi
在薄的旋转壳层（如行星大气层或海洋）上向东流动的纬向流具有类似于明渠流的整体性质，纬向流的纬度宽度类似于明渠流的深度。本文的目的是将明渠水流水力学的形式和一些概念应用于带状流，并通过实验室试验证明结果。特别是一个关键的关系，发现之间的代表性纬向速度，U，和电流的半宽度，a。发现一个无量纲参数（U/βa2），即弗劳德/罗斯比数，类似于明渠水流的弗劳德数。向西流动的电流没有等效的类似物。
Eastward-flowing zonal currents on a thin rotating shell, such as a planetary atmosphere or ocean, have integral properties analogous to open channel flows, the latitudinal width of the zonal current being the analogue of the depth of an open channel flow. The purpose here is to apply the formalism and some of the concepts of open channel flow hydraulics to zonal flows and demonstrate the results with laboratory experiments. In particular a critical relationship is found between a representative zonal velocity, U, and the half-width of the current, a. A dimensionless parameter (U/βa2), the Froude/Rossby number, is found analogous to the Froude number of open channel flow. Westward-flowing currents do not have an equivalent analogue.