High-Resolution Acoustic Seabed Quantification with an Autonomous Underwater Vehicle
Description:
We infer the structure and acoustic properties of muddy and sandy sediment layers along a 12-km seabed transect on the Malta Plateau in the Mediterranean Sea. The data are acquired by an autonomous underwater vehicle with a towed source and towed array of hydrophones. The source emits linear frequency modulated sweeps and the direct and bottom-reflected paths are processed in terms of reflection coefficients as a function of frequency and angle. The processing procedure accounts for path effects and beam pattern of the source. The seabed is parametrized by a sequence of one dimensional models of homogeneous layers with the number of layers treated as unknown. The homogeneous layers are considered as a porous medium via viscous grain-shearing theory. Parameter uncertainties are quantified by Bayesian inference and results are shown for sound speed, attenuation, density, and porosity. The seabed properties agree closely with core samples at two control points. The layering structure agrees closely with an independent sub-bottom seismic survey. Recovering high resolution seabed properties over large areas is shown to be feasible, which can be useful for geohazard surveys and more broadly marine industries, navies and oceanic research organizations.
Session: Marine Seismoacoustics [Poster Session]
Type: Poster
Date: 5/1/2024
Presentation Time: 08:00 AM (local time)
Presenting Author: Tim
Student Presenter: No
Invited Presentation:
Authors
Tim Sonnemann Presenting Author Corresponding Author tim@pdx.edu Portland State University |
Jan Dettmer jan.dettmer@ucalgary.ca University of Calgary |
Charles Holland charles.holland@pdx.edu Portland State University |
Stan Dosso sdosso@uvic.ca University of Victoria |
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High-Resolution Acoustic Seabed Quantification with an Autonomous Underwater Vehicle
Category
Marine Seismoacoustics