Nonlinear phase-resolved reconstruction of irregular water waves. (English) Zbl 1419.76094
Summary: We develop and validate a high-order reconstruction (HOR) method for the phase-resolved reconstruction of a nonlinear wave field given a set of wave measurements. HOR optimizes the amplitude and phase of \(L\) free wave components of the wave field, accounting for nonlinear wave interactions up to order \(M\) in the evolution, to obtain a wave field that minimizes the reconstruction error between the reconstructed wave field and the given measurements. For a given reconstruction tolerance, \(L\) and \(M\) are provided in the HOR scheme itself. To demonstrate the validity and efficacy of HOR, we perform extensive tests of general two- and three-dimensional wave fields specified by theoretical Stokes waves, nonlinear simulations and physical wave fields in tank experiments which we conduct. The necessary \(L\), for general broad-banded wave fields, is shown to be substantially less than the free and locked modes needed for the nonlinear evolution. We find that, even for relatively small wave steepness, the inclusion of high-order effects in HOR is important for prediction of wave kinematics not in the measurements. For all the cases we consider, HOR converges to the underlying wave field within a nonlinear spatial-temporal predictable zone \(\mathcal{P}_{NL}\) which depends on the measurements and wave nonlinearity. For infinitesimal waves, \(\mathcal{P}_{NL}\) matches the linear predictable zone \(\mathcal{P}_L\), verifying the analytic solution presented in [Y. Qi et al., “Predictable zone for phase-resolved reconstruction and forecast of irregular waves”, Wave Motion 77, 195–213 (2018; doi:10.1016/j.wavemoti.2017.12.001)]. With increasing wave nonlinearity, we find that \(\mathcal{P}_{NL}\) contains and is generally greater than \(\mathcal{P}_L\). Thus \(\mathcal{P}_L\) provides a (conservative) estimate of \(\mathcal{P}_{NL}\) when the underlying wave field is not known.
MSC:
| 76B15 | Water waves, gravity waves; dispersion and scattering, nonlinear interaction |
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