Influence of the Underwater Structures upon the Sediment Transport in the Coastal Zone

D. V. Korzinin✉, Ya. V. Saprykina

Shirshov Institute of Oceanology, Russian Academy of Sciences, Moscow, Russian Federation

✉ e-mail: korzinin2000@mail.ru

Abstract

Significantly deepened coastal structures regarded as wave breakers can influence both on the wave and sediment transport parameters in the coastal zone. The wave breakers applied at present are placed not deep and this factor negatively influences navigation and water exchange between the coastline zone and the open sea. Optimal location of the underwater structure permits to arrive at a solution of the beach erosion problem with the purpose of preserving aesthetic attraction of the coast. Due to numerical modeling using the Xbeach model, studied is the influence of the significantly deepened solid and impermeable bar upon the sediment transport depending on different wave parameters and the bar location relative to the coastline. The applied ratios between the parameters of waves and underwater structure provided the most effective wave height and period decrease. Changes in the sediment transport at various locations of a bar relative the coastline are studied. It is revealed that presence of the underwater bar promotes double reduction of the offshore sediment transport. It is shown that the highest effect in reducing the coast erosion (in case the underwater bar is present) is achieved for the waves whose steepness exceeds 0.04. Location of the bar closer to the coast results in the offshore sediment transport decrease for the flat waves and increase – for the steep ones. The offshore sediment transport can be minimized in case the underwater bar position is such that the waves passing over it do not break down, bur remain on the verge of breaking.

Keywords

underwater structures, wave transformation, wave steepness, sediment transport, coastal eros

Acknowledgements

The research is carried out within the framework of the State Order No. 0149-2018-0015.

Original russian text

Original Russian Text © D. V. Korzinin, Ya. V. Saprykina, 2018, published in MORSKOY GIDROFIZICHESKIY ZHURNAL, Vol. 34, Iss. 5, pp. 389–398 (2018)

For citation

Korzinin, D.V. and Saprykina, Ya.V., 2018. Influence of the Underwater Structures upon the Sediment Transport in the Coastal Zone. Physical Oceanography, 25(5), pp. 359-367. doi:10.22449/1573-160X-2018-5-359-367

DOI

10.22449/1573-160X-2018-5-359-367

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