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Acoustic reflections in the water column of Krishna-Godavari offshore basin, Bay of Bengal

DRS at CSIR-National Institute of Oceanography

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Title Acoustic reflections in the water column of Krishna-Godavari offshore basin, Bay of Bengal
 
Creator Sinha, S.K.
Dewangan, P.
Sain, K.
 
Subject OCEANOGRAPHY AND LIMNOLOGY
GEOLOGY AND GEOPHYSICS
OCEANOGRAPHY AND LIMNOLOGY
OCEANOGRAPHY AND LIMNOLOGY
 
Description Seismic oceanographic studies from various oceans worldwide have indicated that the acoustic reflections are mostly observed along thermal boundaries within the water column. However, the authors present a case study of seismic data from Krishna-Godavari Basin which shows that salinity variations also play an important role in the occurrence of water column reflections. The observed reflection is modeled using the reflectivity series derived from the salinity and temperature profiles from a nearby Conductivity-Temperature-Depth (CTD) location. Sensitivity analysis of temperature and salinity on soundspeed shows that the effect of salinity cannot be ignored for modeling acoustic reflections. The synthetic seismogram matches well with the observed reflection seismic data. Remarkable similarities between the reflection seismic and the salinity profile in the upper thermocline suggest the importance of salinity variations on the water column reflection. Furthermore, impedance inversion of the reflectivity data reveals several thermohaline structures in the water column. The origin of these thermohaline structures is largely unaddressed and may be attributed to the fresh water influx coming from Himalayan and Peninsular rivers or due to the presence of different water masses in the Indian Ocean which warrants a detailed study using concurrent seismic and CTD data
 
Date 2016-07-12T07:12:37Z
2016-07-12T07:12:37Z
2016
 
Type Journal Article
 
Identifier The Journal of the Acoustical Society of America, vol.139; 2016; 2424-2431
http://drs.nio.org/drs/handle/2264/5000
 
Language en
 
Rights Copyright [2016]. 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 Acoustical Society of America