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Publications
Zhang, H., Cherneva, Z., Guedes Soares, C. and Onorato, M. (2013), “Comparison of Distributions of Wave Heights from Nonlinear Schroedinger Equation Simulations and Laboratory Experiments”, Proceedings of the 32nd International Conference on Ocean, Offshore and Arctic Engineering (OMAE 2013), 9-14 June, Nantes, France
Numerical simulations of the nonlinear Schrödinger (NLS) equation are performed by using random initial wave conditions characterized by the JONSWAP spectrum. Four different sea states generated in laboratory experiments made in the deep water offshore wave basin of Marintek are compared with the numerical simulations. The comparisons show that the numerical simulation have a high degree of agreement with the laboratory experiments. A small overestimation can be observed, especially in the severe sea state. Nevertheless, the simulations still catch the main characteristics of the large waves and provide an important physical insight into their generation. The coefficient of kurtosis .... presents a similar spatial evolution trend with the abnormal wave density. Thus the nonlinear Gram-Charlier (GC) model is used to predict the wave height distribution. It is shown again that the theoretical approximation based on the GC expansion can describe the larger wave heights reasonably well in most cases. If the sea state is severe, wave breaking can significantly decrease the tail of wave height distribution in reality and hence the discrepancy is observed compared with numerical simulation. Moreover, the number of waves also plays an important role on the prediction of extreme wave height.
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