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Stochastic formalism-based seafloor feature discrimination using multifractality of time-dependent acoustic backscatter

DRS at CSIR-National Institute of Oceanography

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Title Stochastic formalism-based seafloor feature discrimination using multifractality of time-dependent acoustic backscatter
 
Creator Haris, K.
Chakraborty, B.
 
Subject backscatter
multifractal analysis
sediment
 
Description Dual-frequency echo-envelope data acquired using the normal-incidence single-beam echosounder system (SBES) have been examined to study its scale invariant properties. The scaling and multifractality of the SBES echo envelopes (at 33 and 210 kHz) were validated by applying a stochastic-based multifractal analysis technique. The analyses carried out substantiate the hierarchy of multiplicative cascade dynamics in the echo envelopes, demonstrating a first-order multifractal phase transition. The resulting scale invariant parameters (alpha, C1, and H) establish gainful information that can facilitate distinctive delineation of the sediment provinces in the central part of the western continental shelf of India. The universal multifractal parameters among the coarse and fine sediments exhibit subtle difference in alpha and H, whereas the codimension parameter C1 representing the sparseness of the data varies. The C1 values are well clustered at both the acoustic frequencies, demarcating the coarse and fine sediment provinces. Statistically significant correlations are noticeable between the computed C1 values and the ground truth sediment information. The variations in the multifractal parameters and their behavior with respect to the ground truth sediment information are in good corroboration with the previously estimated sediment geoacoustic inversion results obtained at the same locations.
 
Date 2014-02-05T10:04:20Z
2014-02-05T10:04:20Z
2014
 
Type Journal Article
 
Identifier Nonlinear Processes in Geophysics, vol.21(1); 2014; 101–113
http://drs.nio.org/drs/handle/2264/4465
 
Language en
 
Rights © Author(s) 2014. CC Attribution 3.0 License.
 
Publisher European Geosciences Union