Effect of Storm Surges and Wind Waves on Morphodynamic Processes in the Bakalskaya Spit Region
L.V. Kharitonova, E.V. Ivancha, D.V. Alekseev✉
Marine Hydrophysical Institute, Russian Academy of Sciences, Sevastopol, Russian Federation
✉ e-mail: dalexeev@rambler.ru
Abstract
The effect of changing of wind wave directions and heights as well as storm surge heights on the erosion and accumulation processes in the Bakalskaya Spit region of the Black Sea is studied. Numerical model XBeach (eXtreme Beach behavior) is used. The model includes the interacting blocks for calculating short wind waves, barotropic currents and sediment dynamics. It is shown that the XBeach model reproduces basic characteristics of the Bakalskaya Spit dynamics obtained from the observational data analysis. These characteristics include: spit head displacement in the northwest direction due to erosion of its western part and sediment accumulation near its northeastern part; spit erosion in the area of the isthmus which connects the main part of the spit with its distal part up to its separation. Dependence of the erosion location and spatial dimensions, and sediment accumulation upon the characteristics of waves and surges are obtained. It is revealed that when surges are absent, erosion of the spit isthmus is the strongest in case of the wave running from the west as compared to the cases of the wave running from the southwest and northwest. The seabed erosion of different intensity takes place along the entire coastline of the spit. Sediment is accumulated seawards off the erosion areas, but not continuously along the coast. The areas of the most significant sediment accumulation are located to the east off the spit head and to the southwest from the scour along the spit eastern coast. Presence of surges can result both in increase or decrease of the erosion process depending on the wave direction. Changes of the wave heights produce less impact on the morphodynamic process than those of the surge heights.
Keywords
wind waves, wave currents, sediments, numerical simulation
For citation
Kharitonova, L.V., Ivancha, E.V. and Alekseev, D.V., 2015. Effect of Storm Surges and Wind Waves on Morphodynamic Processes in the Bakalskaya Spit Region. Physical Oceanography, (1), pp. 73-84. doi:10.22449/1573-160X-2015-1-73-84
DOI
10.22449/1573-160X-2015-1-73-84
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