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dc.contributor.authorLoveson, V.J.
dc.contributor.authorGujar, A.R.
dc.contributor.authorBarnwal, R.P.
dc.contributor.authorKhare, R.
dc.contributor.authorRajamanickam, G.V.
dc.date.accessioned2014-10-09T12:42:07Z
dc.date.available2014-10-09T12:42:07Z
dc.date.issued2014
dc.identifier.citationJournal of Earth System Science, vol.123(6); 2014; 1375-1385.
dc.identifier.urihttp://drs.nio.org/drs/handle/2264/4630
dc.description.abstractIn this study, results of GPR profiling related to mapping of subsurface sedimentary layers at tsunami affected Karaikal beach are presented . A 400 MHz antenna was used for profiling along 262 m stretch of transect from beach to backshore areas with penetration of about 2.0 m depth (50 ns two-way travel time). The velocity analysis was carried out to estimate the depth information along the GPR profile. Based on the significant changes in the reflection amplitude, three different zones are marked and the upper zone is noticed with less moisture compared to other two (saturated) zones. The water table is noticed to vary from 0.5 to 0.75 m depth (12–15 ns) as moving away from the coastline. Buried erosional surface is observed at 1.5 m depth (40–42 ns), which represents the limit up to which the extreme event acted upon. In other words, it is the depth to which the tsunami sediments have been piled up to about 1.5 m thickness. Three field test pits were made along the transect and sedimentary sequences were recorded. The sand layers, especially, heavy mineral layers, recorded in the test pits indicate a positive correlation with the amplitude and velocity changes in the GPR profile. Such interpretation seems to be difficult in the middle zone due to its water saturation condition. But it is fairly clear in the lower zone located just below the erosional surface where the strata is comparatively more compact. The inferences from the GPR profile thus provide a lucid insight to the subsurface sediment sequences of the tsunami sediments in the Karaikal beach.
dc.language.isoen
dc.publisherIndian Academy of Sciences
dc.rights© Indian Academy of Sciences. 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.
dc.subjectsediment
dc.subjecttsunami
dc.titleGPR studies over the tsunami affected Karaikal beach, Tamil Nadu, south India.
dc.typeJournal Article


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