Impact of wave-dependent stress on storm surge simulations in the North Sea: Ocean model evaluation against in situ and satellite observations

Type Article
Date 2020-10
Language English
Author(s) Pineau-Guillou Lucia1, Bouin Marie-Noëlle2, 5, Ardhuin FabriceORCID5, Lyard Florent3, Bidlot Jean-Raymond4, Chapron Bertrand1
Affiliation(s) 1 : IFREMER, CNRS, IRD, UBO, Laboratoire d’Océanographie Physique et Spatiale, UMR 6523, IUEM, Brest, France
2 : CNRM, UMR 3589, Météo-France et CNRS, Toulouse, France
3 : Laboratoire d’Etudes en Géophysique et Océanographie Spatiales, Centre National de la Recherche Scientifique, Toulouse, France
4 : European Centre for Medium-range Weather Forecasts, Reading, UK
5 : IFREMER, CNRS, IRD, UBO, Laboratoire d’Océanographie Physique et Spatiale, UMR 6523, IUEM, Brest, France
Source Ocean Modelling (1463-5003) (Elsevier BV), 2020-10 , Vol. 154 , P. 101694 (14p.)
DOI 10.1016/j.ocemod.2020.101694
WOS© Times Cited 1
Keyword(s) Air-sea exchanges, Storm surges, Wind stress, Drag coefficient, Wind-wave coupling, North sea
Abstract

We investigate the impact of wave-dependent stress on surge modelling, from case studies in the North Sea, using a global ocean model forced with a wave-atmosphere coupled model. We select the storms with the largest surges and a range of sea state development from young to mature seas. The modelled surges are compared to tide gauges and altimeter data. The ocean model is able to accurately predict storm surges in coastal areas. The consistency of the model outputs, the altimeter, and the tide gauge data confirms the accuracy of altimeters for storm surge measurements. We show that using a wave-dependent rather than a wind-dependent only stress formulation gives more accurate surge simulations when the sea state is young and the sea rougher. Taking into account the waves in the stress formulation has a significant impact on the surges (up to 20 cm).

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Pineau-Guillou Lucia, Bouin Marie-Noëlle, Ardhuin Fabrice, Lyard Florent, Bidlot Jean-Raymond, Chapron Bertrand (2020). Impact of wave-dependent stress on storm surge simulations in the North Sea: Ocean model evaluation against in situ and satellite observations. Ocean Modelling, 154, 101694 (14p.). Publisher's official version : https://doi.org/10.1016/j.ocemod.2020.101694 , Open Access version : https://archimer.ifremer.fr/doc/00648/76032/