Abstract
Chirp sonar and vibracore measurements of bottom variability from scales of centimeters to tens of meters have been conducted during the recent Shallow Water Acoustic Technology (SWAT) experiments at the New Jersey Shelf. Chirp sonar (2–12 kHz) data were used to invert bottom geoacoustic properties with sub-meter resolution. Sediment properties such as density, porosity and sound-speed profiles are inverted from coherent acoustic returns at several sites with well-characterized subbottom reflectors. Also, centimeter-resolution geaoacoustic properties were measured from several vibracores collected along the survey tracks. Chirp sonar inversion results compare favorably with those of co-located sediment core measurements. Both deterministic and stochastic features are deduced from the sonar surveys and co-located sediment core data. Effects of measured bottom spatial variability on the broadband acoustic propagation are also studied by using a Parabolic Equation (PE) model. It was concluded that, in addition to the oceanographic variability, the seafloor and subbottom spatial variability might further spatially decorrelate the acoustic signals propagating in shallow waters.
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© 2002 Springer Science+Business Media Dordrecht
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Turgut, A., Lavoie, D., Walter, D.J., Sawyer, W.B. (2002). Measurements of Bottom Variability During Swat New Jersey Shelf Experiments. In: Pace, N.G., Jensen, F.B. (eds) Impact of Littoral Environmental Variability of Acoustic Predictions and Sonar Performance. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-0626-2_12
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DOI: https://doi.org/10.1007/978-94-010-0626-2_12
Publisher Name: Springer, Dordrecht
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