On a Possible Generation Mechanism for Nonstationary Mountain Waves in the Atmosphere
On a Possible Generation Mechanism for Nonstationary Mountain Waves in the Atmosphere
复制标题
大气中非平稳山波的可能产生机制
DOI：
--
复制
发表时间：
1994
期刊：
影响因子：
--
通讯作者：
I. Chunchuzov
中科院分区：
文献类型：
--
作者：
I. Chunchuzov
摘要本文提出了非平稳风流产生山波的三维理论模型。波的产生机制散射地形的运动湍流不均匀性的风流速度进行了检查。本文计算了山区内波和次声波的辐射水平，并研究了它们在近地面波导中的结构。找到了最有效地产生山地内波的一个条件，指出了非定常波与已知的定常波传播的区别。本文给出了一些实验数据，支持了大气中存在非定常山波的理论假设，以及山波对大气边界层和对流层气压和风速脉动的功率谱和垂直结构的影响。
Abstract A three-dimensional theoretical model of the generation of mountain waves by a nonstationary wind flow is proposed in this paper. A mechanism of wave generation by scattering from orography of moving turbulent inhomogeneities of the wind flow velocity is examined. A calculation of the radiation level of mountain internal and infrasound waves and an investigation of their structure in the near-ground waveguide are carried out. A condition of the most effective generation of the mountain internal waves is found. The difference between propagation of a nonstationary and a well-known stationary wave is pointed out. Some experimental data are produced in the paper, which support a theoretical assumption about the existence of nonstationary mountain waves in the atmosphere and about the influence of these waves on the power spectrum and vertical structure of the pressure and wind velocity fluctuations in the boundary atmospheric layer and troposphere.