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RSS FeedsRemote Sensing, Vol. 11, Pages 2722: UBathy: A New Approach for Bathymetric Inversion from Video Imagery (Remote Sensing)

 
 

20 november 2019 12:03:24

 
Remote Sensing, Vol. 11, Pages 2722: UBathy: A New Approach for Bathymetric Inversion from Video Imagery (Remote Sensing)
 




A new approach to infer the bathymetry from coastal video monitoring systems is presented. The methodology uses principal component analysis of the Hilbert transform of video images to obtain the components of the wave propagation field and their corresponding frequency and wavenumber. Incident and reflected constituents and subharmonics components are also found. Local water depth is then successfully estimated through wave dispersion relationship. The method is first applied to monochromatic and polychromatic synthetic wave trains propagated using linear wave theory over an alongshore uniform bathymetry in order to analyze the influence of different parameters on the results. To assess the ability of the approach to infer the bathymetry under more realistic conditions and to explore the influence of other parameters, nonlinear wave propagation is also performed using a fully nonlinear Boussinesq-type model over a complex bathymetry. In the synthetic cases, the relative root mean square error obtained in bathymetry recovery (for water depths 0.75 m ? h ? 8.0 m ) ranges from ∼1% to ∼3% for infinitesimal-amplitude wave cases (monochromatic or polychromatic) to ∼15% in the most complex case (nonlinear polychromatic waves). Finally, the new methodology is satisfactorily validated through a real field site video.


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32 viewsCategory: Geology, Physics
 
Remote Sensing, Vol. 11, Pages 2721: Study on Sea Clutter Suppression Methods based on a Realistic Radar Dataset (Remote Sensing)
Remote Sensing, Vol. 11, Pages 2720: Spatio-Temporal Variability of the Habitat Suitability Index for the Todarodes Pacificus (Japanese Common Squid) around South Korea (Remote Sensing)
 
 
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