Boussinesq-Type Modeling of Low-Frequency Wave Motions at Marina di Carrara
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 147, Issue 6
Abstract
In this work, we carried out a case study of numerical simulations of low-frequency wave motions at the Marina di Carrara Harbor, where field observations have been conducted from 2005 to 2007. The fully nonlinear Boussinesq model, FUNWAVE-TVD, was applied to study the multiscale processes, including wind waves, infragravity waves, vortical eddies, and their potential effects on harbor operations. To reproduce the bound infragravity waves, the model was modified to take into account the second-order correction in wave generation based on weakly nonlinear second-order theory. Model–data comparisons show that the model correctly predicted the wave spectra in the low-frequency band and the overall long-wave energy inside the harbor. Additional numerical experiments, with different input wave characteristics, indicate that the directional spreading and incident wave direction play a role in predicting short waves inside the harbor, but have limited influence on the long-wave energy distribution, especially for the low-frequency band close to the resonant modes of the harbor. The second-order correction produces correctly the infragravity bands bounded with wave groups in the wave generation region. However, it does not modify the resonant modes and their magnitudes likely due to nearly “white” spectral structure, characterized by a nonzero constant power spectral density block or equivalently constant value/intensity of Fourier modes at different frequencies, in either bound or spurious infragravity waves.
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Data Availability Statement
Some or all data, models, or code generated or used during the study are available in a repository online in accordance with funder data retention policies. Data used in this research are archived at https://doi.org/10.5281/zenodo.5039438. The computer code and MATLAB post-processing scripts are available at https://doi.org/10.5281/zenodo.5039419.
Acknowledgments
Permission was granted by the Chief of Engineers to publish this information. Fengyan Shi was supported in part by an appointment to the Department of Defense (DOD) Research Participation Program administered by the Oak Ridge Institute for Science and Education (ORISE) through an interagency agreement between the US Department of Energy (DOE) and the DOD. ORISE is managed by ORAU under DOE contract number DE-SC0014664. All opinions expressed in this paper are the authors’ and do not necessarily reflect the policies and views of DOD, DOE, or ORAU/ORISE.
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Published In
Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 147 • Issue 6 • November 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Dec 29, 2020
Accepted: Jul 25, 2021
Published online: Sep 15, 2021
Published in print: Nov 1, 2021
Discussion open until: Feb 15, 2022
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