Nonlinear Behavior in the Propagation of Atmospheric Gravity Waves
Nonlinear Behavior in the Propagation of Atmospheric Gravity Waves
复制标题
大气重力波传播中的非线性行为
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
W. Robinson
中科院分区：
文献类型：
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作者：
P. M. Franke;W. Robinson
摘要采用高分辨率二维全非线性数值模型研究了准单色重力波破裂事件的非线性行为。在非线性模型的基础上，建立了一套支持模型来分离波-波和波-平均流相互作用的影响。本研究的重点是在两个不同的频率上打破最初的单色波。这些结果被用来解决非线性效应在重力波传播和饱和中所起作用的一些核心问题。发现波浪-平均流相互作用的存在与否影响破波的性质。将完全非线性模型的计算结果与不考虑波均流相互作用的模型的计算结果进行比较，结果表明，当考虑波均流相互作用时，波浪在较低高度发生倾覆和破碎。研究发现，这种影响与频率有关，频率越高，影响越强。
Abstract The nonlinear behavior of quasi-monochromatic gravity wave breaking events is studied using a high-resolution, two-dimensional, fully nonlinear numerical model. A suite of supporting models is used alongside the nonlinear model to separate the effects of wave–wave and wave–mean flow interactions. The focus of this study is the breaking of initially monochromatic waves at two different frequencies. The results are used to address some of the issues central to the role that nonlinear effects play in gravity wave propagation and saturation. It is found that the presence or absence of wave–mean flow interactions influences the nature of wave breaking. Comparison of the results from the fully nonlinear model with those from a model from which the wave–mean flow interactions are removed indicates that wave overturning and breaking occur at lower altitudes when wave–mean flow interactions are included. This influence is found to be frequency dependent with the effect being stronger at the higher frequen...