Nonlinear Burgers Type Equation for Acoustic Waves in the Ray Approximation in a Moving Atmosphere (Theory, Experiment)

IF 1.9 4区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS pure and applied geophysics Pub Date : 2024-06-06 DOI:10.1007/s00024-024-03505-0
Sergey Kshevetskii, Sergey Kulichkov, Igor Chunchuzov, Marat Zakirov, Elena Golikova, Evgenia Anufrieva, Irina Vereschagina
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Abstract

The derivation of a nonlinear Burgers-type equation for acoustic waves within the ray approximation for an inhomogeneous moving dissipative atmosphere is presented. The equation is applied to investigate the propagation of three-dimensional infrasonic waves, without using significant computational resources. By means of solving the obtained equation, the shapes of infrasonic signals recorded at distances of 295 km and 305 km from the explosion with energy of 30 kt THT were calculated. The observation point at the distance of 295 km (Tsimlyansk) was located in the western direction from the source. At this place, infrasonic signals were recorded corresponding to the sound propagation in the stratospheric and thermospheric acoustic waveguides. The presence of both two stratospheric and two thermospheric rays falling into the same observation point on the Earth's surface is a wave propagation feature result here. The recorded signals in Tsimlyansk also have a complex structure, both for stratospheric and thermospheric infrasonic arrivals. The registration point at a distance of 305 km (Saratov) was located north of the source. For this point, the calculations showed the presence of only thermospheric rays. The calculation results are compared with experimental data. A satisfactory agreement between the calculated and experimental data was obtained for both observation points in Saratov and Tsimlyansk. The calculated data in Tsimlyansk include manifestation features of the multipath structure of infrasound propagation and agree with the complex structure of infrasound signals recorded in Tsimlyansk.

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移动大气中射线近似声波的非线性布尔格斯型方程(理论、实验)
在非均质运动耗散大气的射线近似中,介绍了声波的非线性伯格斯型方程的推导。该方程用于研究三维次声波的传播,无需使用大量计算资源。通过求解所得到的方程,计算了在距离爆炸点 295 千米和 305 千米处记录到的次声波信号的形状,其能量为 30 kt THT。距离 295 千米(齐姆良斯克)的观测点位于爆炸源的西面。在该观测点记录了与声音在平流层和热层声波导管中传播相对应的次声波信号。两个平流层和两个热层射线同时落在地球表面的同一个观测点上,这是这里产生的波传播特征。在齐姆良斯克记录到的信号结构也很复杂,既有平流层次声波到达,也有热层次声波到达。距离 305 公里(萨拉托夫)的登记点位于信号源以北。计算显示,该点只存在热层射线。计算结果与实验数据进行了比较。在萨拉托夫和齐姆扬斯克的两个观测点上,计算数据和实验数据的一致性令人满意。齐姆良斯克的计算数据包括次声波传播多径结构的表现特征,并与齐姆良斯克记录的次声波信号的复杂结构相吻合。
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来源期刊
pure and applied geophysics
pure and applied geophysics 地学-地球化学与地球物理
CiteScore
4.20
自引率
5.00%
发文量
240
审稿时长
9.8 months
期刊介绍: pure and applied geophysics (pageoph), a continuation of the journal "Geofisica pura e applicata", publishes original scientific contributions in the fields of solid Earth, atmospheric and oceanic sciences. Regular and special issues feature thought-provoking reports on active areas of current research and state-of-the-art surveys. Long running journal, founded in 1939 as Geofisica pura e applicata Publishes peer-reviewed original scientific contributions and state-of-the-art surveys in solid earth and atmospheric sciences Features thought-provoking reports on active areas of current research and is a major source for publications on tsunami research Coverage extends to research topics in oceanic sciences See Instructions for Authors on the right hand side.
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