Parameterizations of wave nonlinearity from local wave parameters: a comparison with field data

Three different parameterizations of wave nonlinearity from local wave parameters are applied to field data (free-surface elevation and flow velocities) gathered in different beaches along the Portuguese coast, under diverse wave conditions. The hydrodynamics of the various sites are analyzed, together with the performance of each formulation. The data considered extend the range of the data previously used by the authors of the parameterizations, including longer wave lengths and higher Ursell numbers. A comparison is done, based on skill and agreement index values, to understand the performance and applicability of each parameterization and what could be changed to improve such formulations.