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
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Creator |
Sinha, S.K.
Dewangan, P. Sain, K. |
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Subject |
OCEANOGRAPHY AND LIMNOLOGY
GEOLOGY AND GEOPHYSICS OCEANOGRAPHY AND LIMNOLOGY OCEANOGRAPHY AND LIMNOLOGY |
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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
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Date |
2016-07-12T07:12:37Z
2016-07-12T07:12:37Z 2016 |
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Type |
Journal Article
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Identifier |
The Journal of the Acoustical Society of America, vol.139; 2016; 2424-2431
http://drs.nio.org/drs/handle/2264/5000 |
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Language |
en
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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.
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Publisher |
Acoustical Society of America
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