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| David, P; Guerin-ancey, O; Oudot, G; Van Cuyck, Jp. |
| Although zooplanktonic organisms nearly have the acoustical impedance of water, they backscatter the sound. Strong acoustical echoes from salps were recorded in the Weddell sea at 150 kHz (1992), in the Indian ocean at 12 kHz (1994) and in the Mediterranean at 120 and 38 kHz (1996). Sphere and cylinder models were applied to estimate the salp target strength. The salp is modelled by a cylindrical gelatinous body (length L) and a spherical nucleus (radius a). Backscattering from each part was estimated individually. With a detection threshold of -100 dB, the minimum body length and the minimum radius of nucleus to be theoretically detected were estimated for each of the following frequencies: 12, 38, 120 and 150 kHz. A small salp (L = 14 rum and a = I mm)... |
| Tipo: Text |
Palavras-chave: Salpe; Target strength; Acoustique sous-marine; Salp; Target strength; Underwater acoustics. |
| Ano: 2001 |
URL: http://archimer.ifremer.fr/doc/00322/43341/42886.pdf |
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