Scientific publications

Seiche oscillations at coastal stations of the Sea of Azov caused by the action of stationary winds of different directions lasting 12 hours are investigated based on mathematical modeling. Calculations are made with and without taking into account the Coriolis force. A comparative analysis of the calculation results showed that in Dolzhanskaya, as well as in points located on the southern coast of the Azov Sea: Mysovoy, Temryuk, factoring in the Earth’s rotation in most of the cases led to an increase in the maximum level deviations, reaching up to 50% in Temryuk. In Primorsko-Akhtarsk, as well as in points located on the northern coast: Berdyansk, Mariupol, on the contrary, factoring in account the Coriolis force in most cases led to a weakening of seiches, the most notably in Berdyansk – up to 44 %. In Taganrog, located at the north-eastern end of the sea at the top of the Taganrog Bay, the absolute values of sea level deviations are the largest, but factoring in the Coriolis force does not cause significant changes in the maximum level deviations – they do not exceed 21 %. The Earth’s rotation leads to a phase shift in the Sea of Azov between the level oscillations that occur in the case when the Coriolis force is taken into account and in the case it is not. Depending on the direction of the wind that cause the seiches, this phase shift can be stable or change over time. Seiche oscillations that occur when taking into account the Coriolis force are generally more intensive in the initial stage of the process, but they fade away faster than when it is disregarded. For all the wind directions considered, both with and without taking into account the rotation of the Earth, an intensive mode of seiche oscillations with a period of 14.4 hours is generated. The rotation of the Earth augments the intensity of this mode. In addition, the Coriolis force leads to the generation of higher-frequency modes (with periods of 6.5; 6.9 hours) compared to cases when it is not taken into account (periods of 7.2; 7.5 hours). At the same time, high-frequency oscillations calculated without taking the rotation of the Earth into account are more intensive than with it. Analysis of the calculation results showed that the Earth’s rotation has a noticeable effect on the amplitude, modal composition, and nature of the water movement of seiche oscillations in the Sea of Azov. Taking the Coriolis force into account when modeling seiches in this sea is essential.