Geoacoustic Inversion of Reflection Data in a Water Tank

Authors

  • Junjie (Jason) Shi <p>School of Earth and Ocean Sciences University of Victoria Victoria BC Canada V8P 5C2</p><p>AND</p><p>Key Laboratory of Underwater Acoustic Technology, Harbin Engineering University, China</p>
  • Stan Dosso School of Earth and Ocean Sciences University of Victoria Victoria BC Canada V8P 5C2
  • Dajun Sun <p>College of Underwater Acoustic EngineeringHarbin Engineering UniversityHarbin, China</p>

Abstract

This paper describes a nonlinear Bayesian approach to invert underwater acoustic reflection data for geoacoustic properties of sand layers at the base of a water tank. Recorded broadband acoustic signals (25-35 kHz) were processed by cross-correlating with the transmitted signal, and then windowed and filtered to estimate the reflection coefficient at multiple frequencies. In the Bayesian inversion, the unknown geoacoustic quantities of interest are considered as random variables constrained by data and prior information with the goal of interpreting the multi-dimensional posterior probability density. The inversion applies delayed rejection adaptive Metropolis (DRAM), a Markov Chain Monte Carlo sampling method, which not only provides a maximum a-posteriori parameters estimates but also quantifies the parameters uncertainties in terms of marginal probability distributions and credibility intervals; inter-parameter relationships are quantified by the correlation matrix and joint marginal distributions. Bayesian reflection inversion is illustrated for acoustic data measured in an anechoic water tank experiment conducted at Harbin Engineering University, China.

Author Biographies

Junjie (Jason) Shi, <p>School of Earth and Ocean Sciences University of Victoria Victoria BC Canada V8P 5C2</p><p>AND</p><p>Key Laboratory of Underwater Acoustic Technology, Harbin Engineering University, China</p>

Visiting Scholar, School of Earth and Ocean Sciences University of Victoria Victoria BC Canada V8P 5C2ANDAssistant Professor, Key Laboratory of Underwater Acoustic Technology, Harbin Engineering University, China

Stan Dosso, School of Earth and Ocean Sciences University of Victoria Victoria BC Canada V8P 5C2

Director and ProfessorSchool of Earth and Ocean SciencesUniversity of Victoria

Dajun Sun, <p>College of Underwater Acoustic EngineeringHarbin Engineering UniversityHarbin, China</p>

DeanCollege of Underwater Acoustic EngineeringHarbin Engineering UniversityHarbin, China

Published

2016-08-24

How to Cite

1.
Shi J (Jason), Dosso S, Sun D. Geoacoustic Inversion of Reflection Data in a Water Tank. Canadian Acoustics [Internet]. 2016Aug.24 [cited 2021Apr.12];44(3). Available from: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/2932

Issue

Section

Proceedings of the Acoustics Week in Canada

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