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Spatial distribution of wave energy over complex coastal bathymetries: Development of methodologies for comparing modeled wave fields with satellite observations
Abstract In this study we show that spectral and phase-resolving wave models, used for coastal engineering applications, can provide significant differences in the local wave heights and wave power magnitude in the presence of strong bottom-induced refraction. We present here methodologies to compare, in a consistent manner, model outputs to an alternative source of spatial data derived from Synthetic Aperture Radar (SAR) satellite images. Normalized amplitude-derived data are computed from SAR images, compared to both normalized amplitude-derived map from a phase-resolving model outputs and normalized significant wave height-derived map from a spectral model. Two methodologies of SAR images analysis are developed in this paper. While one appears unsuitable due to stochastic wave group modulations, the second methodology provides encouraging similarities between the SAR data and the phase-resolving model outputs.
Highlights Spectral and phase-resolving wave models behave differently in coastal areas with strong bottom-induced refraction. SAR data may represent a new source of data to investigate the spatial variability of the wave field in coastal waters. Methodologies are developed to derive comparable models and SAR data. Encouraging similarities are observed between the phase-resolving model and SAR data for the site and situations considered.
Spatial distribution of wave energy over complex coastal bathymetries: Development of methodologies for comparing modeled wave fields with satellite observations
Abstract In this study we show that spectral and phase-resolving wave models, used for coastal engineering applications, can provide significant differences in the local wave heights and wave power magnitude in the presence of strong bottom-induced refraction. We present here methodologies to compare, in a consistent manner, model outputs to an alternative source of spatial data derived from Synthetic Aperture Radar (SAR) satellite images. Normalized amplitude-derived data are computed from SAR images, compared to both normalized amplitude-derived map from a phase-resolving model outputs and normalized significant wave height-derived map from a spectral model. Two methodologies of SAR images analysis are developed in this paper. While one appears unsuitable due to stochastic wave group modulations, the second methodology provides encouraging similarities between the SAR data and the phase-resolving model outputs.
Highlights Spectral and phase-resolving wave models behave differently in coastal areas with strong bottom-induced refraction. SAR data may represent a new source of data to investigate the spatial variability of the wave field in coastal waters. Methodologies are developed to derive comparable models and SAR data. Encouraging similarities are observed between the phase-resolving model and SAR data for the site and situations considered.
Spatial distribution of wave energy over complex coastal bathymetries: Development of methodologies for comparing modeled wave fields with satellite observations
Varing, Audrey (author) / Filipot, Jean-François (author) / Delpey, Matthias (author) / Guitton, Gilles (author) / Collard, Fabrice (author) / Platzer, Paul (author) / Roeber, Volker (author) / Morichon, Denis (author)
Coastal Engineering ; 169
2020-10-03
Article (Journal)
Electronic Resource
English
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