статья в журнале

En

Physical Oceanography

ISSN:1573160
eSSN:1573-160X

2023

10.29039/1573-160X-2023-2-160-170

Purpose. The study is aimed at analyzing the impact of the effects of the sea waves’ nonlinearity manifested in the skewness of sea surface elevations and in arising of a group structure, upon the generation of infrasound radiation by the sea surface. Methods and Results. The analysis is based on the analytical model of a wave profile which permits to set an asymmetric wave profile (a pointed crest and a flat trough), and also to vary the grouping factor and the number of waves in a group. The field of surface waves is represented as a superposition of free waves and harmonics. It was studied using the mathematical apparatus of decomposing the analyzed function into the Fourier series. Quantitative estimates characterizing (in different situations) the ratio between the amplitudes of the acoustic waves generated by the main wave and its harmonics were obtained. It was shown that skewness affected the level of infrasound generation to a greater extent than the group structure of waves. Conclusions. Both the skewness of sea wave elevations and their group structure lead to a decrease in the level of infrasound generated by the sea surface, as well as to the redistribution of infrasound energy over the spatial and temporal scales. © 2023 A. S. Zapevalov, and Physical Oceanography.

bonded waves, free waves, group structure, hydroacoustics, infrasound, sea surface

2023-08-03 12:19:37