(Color online) GPS locations of acoustic measurements. Diamond: moored receiving array; black line: acoustic track with a towed source.
(Color online) (a) Pulse compressed results for 60 pings with reduced travel time (see definition in text) in the frequency band of 1.5–6 kHz; (b) same data with the bottom bounce lined up at time zero.
(Color online) (left) Sound speed profile for the tow; (right) geometry for the towed source data.
(Color online) Direct path intensity corrected for spreading and the source beam pattern at 2, 3, 4, and 5 kHz (pings 1–19 have decreasing grazing angles).
(Color online) Measured source beam pattern at 2, 3, 4, and 5 kHz at one azimuth angle with source sitting upright. The direct path from the source to the receiver at 25 m depth corresponds to the angular range of 272°–281°.
(Color online) Bottom loss results at 2, 3, 4, and 5 kHz with a 10% bandwidth.
(Color online) Bottom loss results with uncertainty bounds at 2, 3, 4, and 5 kHz.
Cost function surfaces in terms of ρ-c, c-α, and ρ-α through an exhaustive search at 3 kHz.
(Color online) Best match between model and data at (a) 2 kHz, (b) 3 kHz, (c) 4 kHz, (d) 5 kHz including the feature around 20°.
(Color online) Summary of inversion results for ρ, c, and α (a) using entire BL data and (b) using BL data excluding feature around 20°.
(Color online) PE modeling results at 2, 3, 4, and 5 kHz with (a) flat bottom and (b) an 8 cm high Gaussian bottom feature.
Comparison of sediment sound speed between direct measurements and geoacoustic inversion results in SW06. (a) GPS locations for each measurement and (b) sediment sound speed results. Water sound speed near water/sediment interface is approximately 1498 m/s for SW06.
Comparison of sediment attenuation between direct measurement and geoacoustic inversion within a 2 km boxed area in SW06.
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