Conference paper Open Access

Co-ReSyF SAR-bathymetry application: algorithm testing and performance

Francisco Sancho; Florent Birrien; Alberto Azevedo

The present work focuses on the development of an application within Co-ReSyF (Coastal
waters Research Synergy Framework) platform, that aims at deriving coastal bathymetries from
Synthetic Aperture Radar (SAR) satellite images, with clear swell wave signatures. The method is based
on estimating, first, the predominant wavelength at user-defined grid points from the computation of
the wavenumber spectra via 2D Fast Fourier Transform (FFT) of overlapping sub-images at each point.
The underneath depth is then estimated using the wavenumber dispersion relationship, from
intermediate to shallow waters. Results of the estimated depths within a region of the continental shelf
off Aveiro is presented, showing reasonable agreement with the reference surveyed bathymetry, in the
regions of depth between 10 and 60 metres. The agreement then deteriorates as depth increases until the
wave propagation “deep water limit.

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