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Caractérisation des fonds marins par la méthode des sources images

Abstract : The work presented in this thesis deals with a new seafloor characterization method: the image source method. It is based on a physical model of the reflected waves from a point source by a layered media under the Born approximation. Thus, the reflected signal can be modeled as a sum of contributions coming from image sources relative to the seabed layers. The seabed geometry and sound speed profile can then be recovered with the localization of these image sources. The image source localization is based on recorded signal migrations and the detection is done using a semblance function. So, the method uses only one record of the seabed reflected path for one shot of the source. The main method advantages are the automation of the process, its low computational cost, its good robustness to the noise and the local aspect of the result. The results obtained with real data are very satisfying with both a vertical array and a horizontal array. Especially using an horizontal array, many successive measurements along a straight line give a range dependent sound speed profile of the seabed.
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Contributor : Samuel Pinson <>
Submitted on : Wednesday, February 1, 2012 - 10:17:08 AM
Last modification on : Friday, October 23, 2020 - 4:50:55 PM
Long-term archiving on: : Wednesday, May 2, 2012 - 2:22:12 AM


  • HAL Id : tel-00665037, version 1


Samuel Pinson. Caractérisation des fonds marins par la méthode des sources images. Acoustique [physics.class-ph]. Université de Bretagne occidentale - Brest, 2011. Français. ⟨tel-00665037⟩



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