Study of Seiche Oscillations in the Sevastopol Bay System Based on Field Observations and Mathematical Modeling

Yu. V. Manilyuk✉, Yu. Yu. Yurovsky, A. V. Bagaev, A. Yu. Belokon, D. I. Lazorenko, L.V. Verzhevskaia

Marine Hydrophysical Institute of RAS, Sevastopol, Russian Federation

✉ e-mail: uvmsev@yandex.ru

Abstract

Purpose. The purpose of the study is to determine the parameters of seiche oscillations with periods less than 1 hour and their actual mode composition in the system of interconnected bays located in the coastal zone of Sevastopol, based on in-situ sea level observations and mathematical modeling results.

Methods and Results. Three ultrasonic sea level gauges (developed and manufactured at Marine Hydrophysical Institute, RAS) were deployed in Gollandiya, Karantinnaya and Kruglaya bays for in-situ observations (with a measurement resolution of 10 s). The observations were conducted from July to December 2024. Spectral analysis of the obtained time series revealed peaks in the spectra at periods of 54, 48, 42, 29.7, 23, 17, 12.5, 11, 9.6, 6.8, 4.0 and 2.4 min, corresponding to the natural oscillations of the Sevastopol bays. A series of numerical experiments was carried out using the non-tidal linear version of the hydrodynamic model Advanced Circulation Model for Shelves Coasts and Estuaries (ADCIRC). The computational domain encompassed the entire system of bays and part of the adjacent coastal waters of Sevastopol. “Red noise” was applied as the forcing disturbance. Satisfactory agreement with the in-situ observation data was achieved. Analysis of the modeling results allowed investigation of interactions between the bays and interpretation of the field observation data.

Conclusions. The eigenmodes of elongated narrow bays readily penetrate into neighboring bays within the system of interconnected bays. The Helmholtz mode of Sevastopol Bay (period ~ 50 min) is prominent throughout the system and exhibits high intensity. The eigenmodes of Kruglaya Bay, which has a nearly circular shape, virtually do not penetrate into neighboring bays. The eigenmodes of larger bays are strongly represented in the neighboring smaller bays (Pesochnaya, Abramova) included in the system, with relatively high intensity.

Keywords

long-wave sea level oscillations, seiches in bays, coupled system of oscillations, Sevastopol bays, ADCIRC model

Acknowledgements

The study was funded by the Russian Science Foundation Grant No. 24-27-20076, https://rscf.ru/project/24-27-20076/, and Agreement with the Department of Education and Science of Sevastopol No. 86 dated June 19, 2024.

Original russian text

Original Russian Text © The Authors, 2025, published in MORSKOY GIDROFIZICHESKIY ZHURNAL, Vol. 41, Iss. 6, pp. 732–748 (2025)

For citation

Manilyuk, Yu.V., Yurovsky, Yu.Yu., Bagaev, A.V., Belokon, A.Yu., Lazorenko, D.I. and Verzhevskaia, L.V., 2025. Study of Seiche Oscillations in the Sevastopol Bay System Based on Field Observations and Mathematical Modeling. Physical Oceanography, 32(6), pp. 755-770.

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