Abstract
A novel implementation of parameters estimating the space-time wave extremes within the spectral wave model WAVEWATCH III (WW3) is presented. The new output parameters, available in WW3 version 5.16, rely on the theoretical model of Fedele (J Phys Oceanogr 42(9):1601-1615, 2012) extended by Benetazzo et al. (J Phys Oceanogr 45(9):2261–2275, 2015) to estimate the maximum second-order nonlinear crest height over a given space-time region. In order to assess the wave height associated to the maximum crest height and the maximum wave height (generally different in a broad-band stormy sea state), the linear quasi-determinism theory of Boccotti (2000) is considered. The new WW3 implementation is tested by simulating sea states and space-time extremes over the Mediterranean Sea (forced by the wind fields produced by the COSMO-ME atmospheric model). Model simulations are compared to space-time wave maxima observed on March 10th, 2014, in the northern Adriatic Sea (Italy), by a stereo camera system installed on-board the “Acqua Alta” oceanographic tower. Results show that modeled space-time extremes are in general agreement with observations. Differences are mostly ascribed to the accuracy of the wind forcing and, to a lesser extent, to the approximations introduced in the space-time extremes parameterizations. Model estimates are expected to be even more accurate over areas larger than the mean wavelength (for instance, the model grid size).
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Acknowledgments
The research was partially supported by NCEP/ NOAA, and partially by the Flagship Project RITMARE-The Italian Research for the Sea, coordinated by the Italian National Research Council and funded by the Italian Ministry of Education, University and Research within the National Research Program 2011-2015. Part of the research was done during the visit of Francesco Barbariol to NCEP/NOAA, supported by the 2015 Short-Term Mobility Program of the Italian National Research Council (CNR). Authors gratefully acknowledge prof. Francesco Fedele (GATECH, USA) for discussions, and CNMCA (Italy) for providing the wind model data. The WASS software is available at www.dais.unive.it/wass/.
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Responsible Editor: Oyvind Breivik
This article is part of the Topical Collection on the 14th International Workshop on Wave Hindcasting and Forecasting in Key West, Florida, USA, November 8-13, 2015
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Barbariol, F., Alves, JH.G.M., Benetazzo, A. et al. Numerical modeling of space-time wave extremes using WAVEWATCH III. Ocean Dynamics 67, 535–549 (2017). https://doi.org/10.1007/s10236-016-1025-0
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DOI: https://doi.org/10.1007/s10236-016-1025-0