Density Current Circulations in Shear Flows
Density Current Circulations in Shear Flows
复制标题
剪切流中的密度电流环流
DOI：
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发表时间：
1994
期刊：
影响因子：
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通讯作者：
M. Moncrieff
中科院分区：
文献类型：
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作者：
Qin Xu;M. Moncrieff
本文发展了一个理想的(无粘双流体)二维稳态密度流环流模型及其锋面传播到均匀切变环境流中的模型。这个完全非线性的分析模型被用来研究控制密度流深度和传播速度的运动学和动力学因素以及密度流锋面的几何形状。结果表明，与环境入流切变相比，密度流冷池内部环流的强度对密度流的深度和传播速度起次要作用，至少有一种密度流具有恒定涡度。冷池环流的方向既可以是顺时针的，也可以是逆时针的，不影响无粘性保守密度流的传播速度、深度和几何形状。对结果的物理解释提供了关于流入切变控制形状的方式。
Abstract This paper develops an idealized (inviscid two fluid), two-dimensional, steady-state model of a density current circulation and its front propagating into a uniformly sheared environmental flow. This fully nonlinear analytical model is used to examine the kinematic and dynamic factors that control the depth and propagation speed of the density current and the geometric shape of the density current front. The results show that in comparison with the environmental inflow shear, the strength of the internal circulation within the cold pool of a density current plays a secondary role in controlling the depth and propagation speed of the density current, at least one having constant vorticity. The direction of the cold pool circulation can be either clockwise or anticlockwise, not affecting the propagation speed, depth, and geometric shape of an inviscid conservative density current. Physical interpretation of the results is provided in regard to the way that the inflow shear controls the shape of the...