Resuspension of Bottom Sediments in a Shallow Lagoon by Currents and Waves Based on the Numerical Modeling Data (Using the Example of Sivash Bay, the Sea of Azov)

V. V. Fomin, E. V. Ivancha✉, A. A. Polozok

Marine Hydrophysical Institute of RAS, Sevastopol, Russian Federation

✉ e-mail: ev_ivancha@rambler.ru

Abstract

Purpose. The work is purposed at studying the intensity of resuspension of silty bottom sediments in Eastern Sivash Bay (the Sea of Azov) during an extreme storm, as well as at assessing the contribution of currents and wind waves to the resuspension processes.

Methods and Results. The current fields are calculated using a three-dimensional σ-coordinate water circulation model of the POM type supplemented with a block of silty sediments resuspension. The SWAN spectral model is applied to calculate wind waves. In both models a rectangular computational grid with the horizontal resolution 300 m is involved. The ERA-Interim atmospheric reanalysis data corresponding to the extreme storm situation in November 10–13, 2007 are used as a forcing. The performed calculations constituted a base for analyzing the structure of the fields of waves, currents, bottom shear stresses and suspended matter concentration in Eastern Sivash for different phases of the storm. A technique for assessing the resuspension model sensitivity to the variations in the input parameter values is proposed.

Conclusions. The applied resuspension model is most sensitive to the variations in the parameter values that condition intensity of the silt particles vertical flow from the basin bottom. During the period of the storm maximum development, conditions for forming resuspension zones arise on 80 % of the total area of Eastern Sivash Bay. If, while modeling, the contribution of the waves is not taken into account, the total area of resuspension is reduced by four times. This fact testifies to a decisive contribution of the bottom wave stresses in formation of the resuspension zones in bottom sediments in the bay.

Keywords

resuspension, bottom sediments, silt fraction, currents, wind waves, numerical modeling, Sivash

Acknowledgements

The study was carried out within the framework of theme of the FSBSI FRC MHI FNNN-2021-0005. The model calculations were performed at the MHI computing cluster.

Original russian text

Original Russian Text © V. V. Fomin, E. V. Ivancha, A. A. Polozok, 2024, published in MORSKOY GIDROFIZICHESKIY ZHURNAL, Vol. 40, Iss. 3, pp. 469–488 (2024)

For citation

Fomin, V.V., Ivancha, E.V. and Polozok, A.A., 2024. Resuspension of Bottom Sediments in a Shallow Lagoon by Currents and Waves Based on the Numerical Modeling Data (Using the Example of Sivash Bay, the Sea of Azov). Physical Oceanography, 31(3), pp. 427-445.

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