Numerical Simulation of Tsunami Wave Propagation to the Balaklava Bay

V. V. Fomin, A. Yu. Belokon✉, L. V. Kharitonova, D. V. Alekseev

Marine Hydrophysical Institute of RAS, Sevastopol, Russian Federation

✉ e-mail: aleksa.44.33@gmail.com

Abstract

Purpose. To investigate the process of tsunami wave propagation from the hypothetical earthquake foci to the Balaklava Bay, and to zone the tsunami impact upon the bay coastline based on the results of numerical modeling, are the purposes of the paper.

Methods and Results. The results of numerical simulation of the tsunami wave propagation to the Balaklava Bay with subsequent flooding of the coast are presented. The problem of the tsunami wave propagation from three hypothetical earthquake foci and their evolution in the Black Sea was solved using the nonlinear model of long waves. Time dependences of the sea level fluctuations at the entrance to the Balaklava Bay were obtained. They were applied as boundary conditions at the liquid boundary of the computational domain, where the SWASH model had been used to simulate numerically the tsunami wave propagation in the bay with their subsequent run-up to the coast.

Conclusions. Propagation of tsunami waves in the Balaklava Bay is accompanied by formation of the sea level seiche oscillations with a period ~ 8 min which correspond to the Helmholtz mode. Inside the bay, the tsunami heights increase by 5–6 times as compared to those at the entrance to the computational domain. The sea level fluctuations are maximal at the bay top, where its rise achieves 1.4–1.5 m. The eastern coast of the Balaklava Bay and the one adjacent to its top are subject to the strongest flooding. The values of water level on land measured from the ground level, reach 1.0–1.5 m, and at the bay top – 1.8 m. At the eastern coast of the bay, the flooding maximum length constitutes 60 m, at its top – 90 m.

Keywords

numerical simulation, tsunami, tsunami zoning, SWASH, Balaklava Bay

Acknowledgements

The investigation was carried out within the framework of the state assignment on theme No. 0555-2021-0005.

Original russian text

Original Russian Text © The Authors, 2022, published in MORSKOY GIDROFIZICHESKIY ZHURNAL, Vol. 38, Iss. 4, pp. 405–42 (2022)

For citation

Fomin, V.V., Belokon, A.Yu, Kharitonova, L.V. and Alekseev, D.V., 2022. Numerical Simulation of Tsunami Wave Propagation to the Balaklava Bay. Physical Oceanography, 29(4), pp. 379-394. doi:10.22449/1573-160X-2022-4-379-394

DOI

10.22449/1573-160X-2022-4-379-394

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