Abstract
The image source method characterizes the sediment sound-speed profile from seafloor reflection data with a low computational cost compared with inversion techniques. Recently, the method has been extended to treat non-parallel sediment layering. The method is applied to data from an autonomous underwater vehicle (AUV) towing a source (1600–3500 Hz) and an horizontal array of hydrophones. AUV reflection measurements were acquired every 3 m along 10 criss-cross lines over a 1km 2 area with evidently dipping layers. Mapping the along track sound-speed profiles in geographical coordinates results in a pseudo-3D (Nx2D) sediment structure characterization of the area down to several tens of meters in the sub-bottom. The sound speed profile agreement at crossing points is quite good.
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