A study of the sea level and current effects on the sea state in Galway Bay,using the numerical model COAWST |
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Authors: | Calvino Clment Dabrowski Tomasz Dias Frdric |
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Institution: | 1.School of Mathematics and Statistics, University College Dublin, Belfield, Dublin 4, D04V1W8, Ireland ;2.Ocean Modelling Team, Marine Institute, Rinville, Oranmore, H91R673, Ireland ; |
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Abstract: | A coupled wave and ocean model is applied to the region of Galway Bay in the west of Ireland, using the numerical modelling suite COAWST. The coupled model was validated in a previous study. Here we focus on the impact of the currents and sea level on the sea state during Storm Hector (2018/06/14). The purpose of the research is to improve the wave dynamics knowledge specifically in Galway Bay by highlighting and quantifying the dominant current-induced mechanisms on the sea state observed numerically. We want to know where wave-current interaction is modifying the sea state in the bay, and if the change is significant to justify the use of a coupled model for an operational application. We show that the impacts of the tidal sea surface height on bottom friction and of the current-induced refraction on the spatial distribution of the waves are the dominant mechanisms. Those two effects are well-documented and observed in the literature already. A strong feedback impact of the coupling is also put into evidence. The wave-induced response in terms of currents leads to a noticeable variation in terms of wave height. Less documented in the literature, we discuss the link between current-induced refraction and the reduction of wave generation by wind. |
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