The impact of surface currents and sea level on the wave field evolution during St. Jude storm in the eastern Baltic Sea

• Autorzy: Viitak M. , Maljutenko I. , Alari V. , Suursaar Ü. , Rikka S. , Lagemaa P.

Identyfikatory

DOI

10.1016/j.oceano.2016.01.004

• Języki publikacji: EN

Abstrakty

EN

A third generation numerical wave model SWAN (Simulating WAves Nearshore) was applied to study the spatio-temporal effect of surface currents and sea level height on significant wave height; and to describe the mechanisms responsible for wave–current interaction in the eastern Baltic Sea. Simulation results were validated by comparison with in situ wave measurements in deep and shallow water, carried out using the directional wave buoy and RDCP respectively, and with TerraSAR-X imagery. A hindcast period from 23 to 31 October 2013 included both a period of calm to moderate weather conditions and a severe North-European windstorm called St. Jude. The prevailing wind directions were southerly to westerly. Four simulations with SWAN were made: a control run with dynamical forcing by wind only; and simulations with additional inputs of surface currents and sea level, both separately and combined. A clear effect of surface currents and sea level on the wave field evolution was found. It manifested itself as an increase or decrease of significant wave height of up to 20%. The strength of the interaction was influenced by the propagation directions of waves and surface currents and the severity of weather conditions. An increase in the wave height was mostly seen in shallower waters and in areas where waves and surface currents were propagating in opposite directions. In deeper parts of the eastern Baltic Sea and in case of waves and surface currents propagating in the same direction a decrease occurred.

Słowa kluczowe

EN

SWAN; wave–current–surge interaction; extreme storm; hindcast; SAR

• Wydawca: Polish Academy of Sciences, Institute of Oceanology ; Elsevier
• Czasopismo: Oceanologia
• Rocznik: 2016
• Tom: No. 58 (3)
• Strony: 176--186
• Opis fizyczny: Bibliogr. 32 poz., rys., tab., wykr., mapy

Twórcy

autor

Viitak M.

• Tallinn University of Technology, Marine Systems Institute, Tallinn, Estonia

autor

Maljutenko I.

• Tallinn University of Technology, Marine Systems Institute, Tallinn, Estonia

autor

Alari V.

• Helmholtz-Zentrum Geesthacht, Centre for Material and Coastal Research, Geesthacht, Germany

autor

Suursaar Ü.

• University of Tartu, Estonian Marine Institute, Estonia

autor

Rikka S.

• Tallinn University of Technology, Marine Systems Institute, Tallinn, Estonia

autor

Lagemaa P.

• Tallinn University of Technology, Marine Systems Institute, Tallinn, Estonia
• Estonian Environment Agency, Estonian Weather Service, Estonia

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