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Determination of nodule coverage parameters using multibeam normal incidence echo characteristics: A study in the Indian Ocean

DRS at CSIR-National Institute of Oceanography

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Title Determination of nodule coverage parameters using multibeam normal incidence echo characteristics: A study in the Indian Ocean
 
Creator Chakraborty, B.
Pathak, D.
Sudhakar, M.
Raju, Y.S.N.
 
Subject echo surveys
sonar
amplitude
nodules
abundance
distribution
correlation analysis
 
Description A study of the echo peak amplitudes from known nodule areas is initiated to observe the acoustic response for varying nodule abundances and number densities. A statistical study of the peak amplitudes from different nodule areas confirms that the coefficient of variation is the highest for medium nodule abundance and number density. Echo fluctuation study based on the Rician probability density function (PDF) establishes that the non-nodule sediment bottom contributes to less scattering i.e., it is a microtopographic type, whereas scattering is dominant in the nodule-bearing areas. The spectral studies are conducted on depth data of different areas. this study ensures that the signal scattering int he nodule bottom area is due to the nodules lying on the seabed rather than the large/small-scale topographic variations. The study based on Poisson PDF for nodule area confirms this fact again. Agreement between the nodule distribution and the Poisson distribution parameter is clearly seen. Such a relation is not observed in the case of Rician density functions
 
Date 2009-01-12T09:18:26Z
2009-01-12T09:18:26Z
1997
 
Type Journal Article
 
Identifier Marine Georesources and Geotechnology, Vol.15; 33-48p.
http://drs.nio.org/drs/handle/2264/2060
 
Language en
 
Rights Copyright [1997]. All efforts have been made to respect the copyright to the best of our knowledge. Inadvertent omissions, if brought to our notice, stand for correction and withdrawal of document from this repository.
 
Publisher Taylor and Francis