Research Article
Acoustical Measurement and Biot Model for Coral Reef Detection and Quantification
Table 2
Configuration of the four acoustic frequencies.
| Frequency (kHz) | Type of beam | Half-power beam width (°) | Source level at 1 m (dB re 1 μPa) | Acoustic power (W) | Pulse length (ms) | Noise level (dB) at 1 m depth | Absorption (dB/km) |
| 10 | Single | 7.0 × 6.9 | 219.8 | 100 | 0.512 | | 0.45 | 50 | Single | 7.2 × 7.3 | 216.9 | 150 | 0.512 | | 4.5 | 100 | Single | 6.5 × 6.5 | 217.5 | 80 | 0.512 | | 12.4 | 200 | Split | 5.4 × 5.4 | 218.5 | 60 | 0.500 | | 57.5 |
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