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Sound speed profile characterization by the image source method
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Image of FIG. 1.
FIG. 1.

Sketch of the experiment. The source is 200 m away from the vertical array. The receiver array, moored on the seafloor, is made of 15 hydrophones, is 64 m long. The lowermost hydrophone is around 12 m above the seafloor.

Image of FIG. 2.
FIG. 2.

Signal emitted by the source (a) in the time domain and (b) in the frequency domain.

Image of FIG. 3.
FIG. 3.

Temporal signal computed for the hydrophone of the array. Numbers 1–10 stand for interface reflections.

Image of FIG. 4.
FIG. 4.

Left: experiment area of the Scarab experiment. Right: sound speed profile obtained from inversion for site 2 (Ref. 3 ).

Image of FIG. 5.
FIG. 5.

Temporal signal recorded at the hydrophone of the array.

Image of FIG. 6.
FIG. 6.

Modeling of the seafloor with image sources: (a) original configuration, (b) each reflection on an interface is replaced by its image source, (c) the final equivalent system.

Image of FIG. 7.
FIG. 7.

Focus on the image sources using for (a) the synthetic model and (b) the SCARAB data. The source is at and the solid line at represents the seafloor. The array is not drawn on the picture and is at .

Image of FIG. 8.
FIG. 8.

Focus on the image sources using (in dB) for (a) the synthetic model and (b) the SCARAB data.

Image of FIG. 9.
FIG. 9.

Image sources gap to the vertical of the real source.

Image of FIG. 10.
FIG. 10.

Refraction of ray in layered media.

Image of FIG. 11.
FIG. 11.

Image sources before (a) and after (b) alignment for the synthetic data.

Image of FIG. 12.
FIG. 12.

Sound speed profiles found with the synthetic data (a) and with the real data (b) (see Ref. 3 for details).


Generic image for table

Geoacoustic parameters for the synthetic data. The media used here are non-dissipative.

Generic image for table

Comparison of results with measured data between Holland’s and image source method.


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Scitation: Sound speed profile characterization by the image source method