Physical Oceanography Physical Oceanography 1573-160X 20250208 Experimental and field research Research Article Relationship between the Energy of Gravity and Infragravity Sea Waves https://orcid.org/0000-0002-2806-3834 7003888822 A-7685-2014 5241-3375 Dolgikh G. I.
Russian Federation
dolgikh@poi.dvo.ru https://orcid.org/0000-0001-9828-5929 6604069353 1836-2541 Dolgikh S. G.
Russian Federation
sdolgikh@poi.dvo.ru https://orcid.org/0000-0002-9197-7452 58405940300 HMO-8458-2023 8711-4746 Bolsunovskii M. A.
Russian Federation
bolsunovsky.ma@poi.dvo.ru V.I. Il'ichev Pacific Oceanological Institute, Far Eastern Branch of RAS Vladivostok Russian Federation Institute of Automation and Control Processes, Far Eastern Branch of RAS Vladivostok Russian Federation 30 04 2025 32 2 270 285 23 12 2024 16 01 2025 29 01 2025 Copyright ©; 2025, G. I. Dolgikh, S. G. Dolgikh, M. A. Bolsunovskii 2025 G. I. Dolgikh, S. G. Dolgikh, M. A. Bolsunovskii https://creativecommons.org/licenses/by-nc/4.0/ https://physical-oceanography.ru/repository/issues/2025/02/08/

Purpose. A comprehensive analysis of data regarding sea waves of gravity and infragravity ranges, obtained with the help of a supersensitive detector of hydrosphere pressure variations, was conducted. This detector was installed at a depth of 25 m on the shelf of the Sea of Japan.

Methods and Results. The synchronous data of the instrument on infragravity (25 s – 8 min) and gravity (2–25 s) ranges were analyzed, and it was established that the change in the total energy of harmonics in the infragravity range almost always correlates with the change in the total energy of harmonics in the gravity range. However, the total energy of harmonics in the gravity range is always greater than the total energy of harmonics in the infragravity range. A detailed analysis of 629 fragments of the supersensitive detector of hydrosphere pressure variation records reveals a variation in the ratio of the total energy of harmonics of the gravity range to the total energy of harmonics of the infragravity range, varying from 1.16 to 19.70.

Conclusions. In the context of the 629 sections of recordings considered, 16 cases demonstrated an anticorrelation between the total energy of the harmonics of the gravitational range and the total energy of the harmonics of the infragravity range. For the remaining 613 cases, the correlation coefficient ranged from 0.81 to 0.96.

 sea excitement gravity range infragravity range abnormal behavior harmonics supersensitive detector hydrosphere pressure variations This research was conducted with partial financial support from grant No. 075-15-2024-642, entitled "Study of the processes and patterns of occurrence, development, and transformation of catastrophic phenomena in the oceans and on continents using seismoacoustic monitoring methods". The authors would like to express their profound gratitude to all employees of the Physics of Geospheres Laboratory.

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