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首页> 外文期刊>Journal of oceanography >Form Drag Caused by Topographically Forced Waves in a Barotropic β Channel: Effect of Higher Mode Resonance
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Form Drag Caused by Topographically Forced Waves in a Barotropic β Channel: Effect of Higher Mode Resonance

机译：正压β通道中地形受力波引起的形式阻力：高模共振的影响

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摘要

The relationship between form drag and the zonal mean velocity of steady states is investigated in a very simple system; a barotropic quasi-geostrophic β channel with sinusoidal topography. When a steady solution is calculated by the modified Marquardt method, keeping the zonal mean velocity constant as a parameter, the characteristic of the solution changes at a phase speed of a wave with a wavenumber higher than that of the bottom topography. For velocities smaller than this critical value, there exists a stable quasi-linear solution similar to the linear solution. For larger velocities, there exist three solutions whose form drag is very large. In addition, the resonant velocity of the mode, whose wavenumber is the same as the bottom topography, has no effect on these solutions. When the quiescent fluid is accelerated by a constant wind stress, acceleration stops around the critical velocity for a wide range of the wind stress. If the wind stress is too large for the acceleration to stop, the zonal current speed continues to increase infinitely. It is implied that the zonal velocity of equilibrium is mainly determined, not by the wind stress, but by the amplitude of the bottom topography and the viscosity coefficient.
机译：在一个非常简单的系统中研究了形式阻力与稳态区域平均速度之间的关系。正弦形正压准地转β通道。当使用改进的Marquardt方法计算稳定解时，将平均纬向速度作为参数保持不变，则解的特性将以波数高于底部形貌的波的相速度改变。对于小于该临界值的速度，存在类似于线性解的稳定的拟线性解。对于较大的速度，存在三种形式阻力很大的解决方案。此外，波数与底部形貌相同的模的共振速度对这些解决方案没有影响。当静态流体在恒定的风应力作用下加速时，对于大范围的风应力，加速度都会在临界速度附近停止。如果风应力太大而无法停止加速，则纬向电流速度将继续无限增大。这意味着平衡的纬向速度主要不是由风应力决定的，而是由底部地形的振幅和粘度系数决定的。

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