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Discussion papers | Copyright
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 06 Aug 2018

Research article | 06 Aug 2018

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Ocean Science (OS).

Wave boundary layer model in SWAN revisited

Jianting Du1,3,4, Rodolfo Bolaños2, Xiaoli Guo Larsén1, and Mark Kelly1 Jianting Du et al.
  • 1Department of Wind Energy, Technical University of Denmark, Risø Campus, Roskilde, Denmark
  • 2DHI, Agern Allé 5, DK-2970 Hørsholm, Denmark
  • 3First Institute of Oceanography, State Oceanic Administration, Qingdao, China
  • 4Laboratory for Regional Oceanography and Numerical Modeling, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China

Abstract. In this study we extend the work presented in Du et al. (2017) to make the WBLM applicable for real cases by improving the wind input and white-capping dissipation source functions. Improvement via the new source terms includes three aspects. First, the WBLM wind-input source function is developed by considering the impact of wave-induced wind profile variation on the estimation of wave growth rate. Second, the white-capping dissipation source function is revised to be not explicitly dependent on wind speed for real wave simulations. Third, several improvements are made to the numerical WBLM algorithm, which increase the model's numerical stability and computational efficiency. The improved WBLM wind-input and white-capping dissipation source functions are calibrated through idealized fetch-limited and depth-limited studies, and validated in real wave simulations during two North Sea storms. The new WBLM source terms show better performance in the simulation of significant wave height and mean wave period than the original source terms.

Jianting Du et al.
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Jianting Du et al.
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Publications Copernicus
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Short summary
Ocean surface waves generated by wind and dissipated by white-capping are two important physics processes for numerical wave simulations. In this study, a new pair of wind-wave generation and dissipation source functions is implemented in a wave model SWAN, and it shows better performance in real wave simulations during two North Sea storms. The new source functions can be further used in other wave models for both academic and engineering purposes.
Ocean surface waves generated by wind and dissipated by white-capping are two important physics...