By Jean-Claude Le Gac, Yann Steéphan (auth.), Andrea Caiti, N. Ross Chapman, Jean-Pierre Hermand, Sérgio M. Jesus (eds.)

This quantity includes the gathering of papers from the second one workshop on Experimental Acoustic Inversion options for Exploration of the Shallow Water atmosphere.

Acoustic thoughts give you the preferable capacity for distant sensing of ocean and sea flooring tactics, and for probing the constitution underneath the ocean ground. No different strength propagates as successfully within the ocean: radio waves and visual gentle are seriously constrained in diversity as the ocean is a hugely conductive medium. even though, sound from breaking waves and coastal transport may be heard in the course of the ocean, and marine mammals speak acoustically over basin scale distances.

The papers during this booklet point out a excessive point of study curiosity that has generated major growth in improvement and alertness of experimental acoustic inversion suggestions. The functions span a vast scope in geosciences, from geophysical, organic or even geochemical study. The record contains: estimation of geotechnical houses of sea mattress fabrics; navigation and mapping of the ocean flooring; fisheries, aquaculture and sea mattress habitat evaluation; tracking of marine mammals; sediment delivery; and research of traditional geohazards in marine sediments.

Audience

This booklet is essentially meant for physicists and engineers operating in underwater acoustics and oceanic engineering. it's going to even be of curiosity to marine biologists, geophysicists and oceanographers as capability clients of the methodologies and methods defined within the booklet contributions.

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Extra resources for Acoustic Sensing Techniques for the Shallow Water Environment: Inversion Methods and Experiments

Sample text

The assumed form of the data errors was validated by applying rigorous statistical tests to the data residuals. The inversion results indicate well-defined estimates for compressional-wave velocity, density, and compressional attenuation at both sites. In addition, low shear-wave velocities were indicated; however, shear attenuation was unconstrained by the reflection data. Variations in vp , ρ, and αp are clearly resolved between the two sites, with differences between parameter estimates that are substantially larger than the estimate uncertainties (more than an order of magnitude for vp ).

The Kolmogorov-Smirnov (KS) test [17] can be applied to test the null hypothesis H0 that the data residuals are from the Gaussian distribution against the alternate hypothesis H1 that the residuals are not from this distribution, based on the maximum difference between the respective cumulative marginal distributions. The corresponding p value value represents the probability of obtaining a test statistic at least as extreme as that observed assuming the null hypothesis is true, quantifying the strength of the evidence against H0 .

29 A. R. -P. M. ), Acoustic Sensing Techniques for the Shallow Water Environment, 29–46. © 2006 Springer. Printed in the Netherlands. 30 M. -P. HERMAND The review covers a number of approaches ranging from Tappert’s original acoustic retrogation to Parvulescu’s time reversal and adjoint modelling. Even though they are not implementing backpropagation as a mechanism of optimisation (they rely on global optimisation), the classical matchedfield processing (MFP) and the model-based matched filter (MBMF) approaches are discussed in this review since they can be viewed as a model-based version of the phase-conjugation and time-reversal concepts, respectively.

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