Observation-based source terms in the third-generation wave model WAVEWATCH
Date
2015
Authors
Zieger, Stefan
Babanin, Alexander V
Rogers, W. Erick
Young, Ian
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Publisher
Elsevier
Abstract
Measurements collected during the AUSWEX field campaign, at Lake George (Australia), resulted in new insights into the processes of wind wave interaction and whitecapping dissipation, and consequently new parameterizations of the input and dissipation source terms. The new nonlinear wind input term developed
accounts for dependence of the growth on wave steepness, airflow separation, and for negative growth rate
under adverse winds. The new dissipation terms feature the inherent breaking term, a cumulative dissipation
term and a term due to production of turbulence by waves, which is particularly relevant for decaying
seas and for swell. The latter is consistent with the observed decay rate of ocean swell. This paper describes
these source terms implemented in WAVEWATCH III ®and evaluates the performance against existing source
terms in academic duration-limited tests, against buoy measurements for windsea-dominated conditions,
under conditions of extreme wind forcing (Hurricane Katrina), and against altimeter data in global hindcasts.
Results show agreement by means of growth curves as well as integral and spectral parameters in the simulations
and hindcast.
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Ocean Modelling
Type
Journal article
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2037-12-31
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