Geoacoustic Inversion for a New England Mud Patch Sediment Using the Silt-Suspension Theory of Marine Mud

This article provides an application of the silt-suspension theory to a Bayesian-inference inversion for the geo-acoustic parameters in marine mud. The theory, with consequences that have been developed recently, postulates a suspension of water and clay mineral card-houses that supports moderately...

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Bibliographic Details
Published in:IEEE journal of oceanic engineering 2020-01, Vol.45 (1), p.144-160
Main Authors: Brown, Elisabeth M., Lin, Ying-Tsong, Chaytor, Jason D., Siegmann, William L.
Format: Article
Language:English
Subjects:
Acoustic data
Acoustic propagation
Acoustic properties
Acoustics
Attenuation
Bayesian inference
Clay
Clay minerals
Dependence
Feasibility studies
Frequency dependence
geoacoustic inversion
Hydrophones
marine mud
Mathematical models
Measuring instruments
Mud
Ocean floor
Oceans
Parameter sensitivity
Parameters
Piston corers
Pistons
Probability theory
Properties
Receivers
Sea measurements
Sediments
Sensitivity analysis
Silt
silt-suspension theory
Sound velocity
Theories
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Summary:This article provides an application of the silt-suspension theory to a Bayesian-inference inversion for the geo-acoustic parameters in marine mud. The theory, with consequences that have been developed recently, postulates a suspension of water and clay mineral card-houses that supports moderately dilute concentrations of silt particles. The approach is an example of a physically based model inversion, in which parameters representing physical mud-layer properties are obtained by inversion and used to produce estimates of geoacoustic properties, including their frequency dependence. The acoustic data are from a combustive source signal propagated along a track, located over several meters of fine-grained mud in the New England Mud Patch, to a single hydrophone on a receiver array during the 2017 Seabed Characterization Experiment. Data extracted from a nearby piston core inform the physical modeling, with selections of inversion parameters guided by both sensitivity analyses and bounds from archival and core measurements. Results show the feasibility of this inversion approach. The estimates of mud density and sound speed are close to values obtained independently. The frequency dependence of attenuation is estimated over the full low-frequency source band and has an approximate power exponent of 1.72.
ISSN:0364-9059
1558-1691
DOI:10.1109/JOE.2019.2934604