Integrated approach of assessing sedimentary characteristics of onshore sand deposits on the Velankanni coast, Tamil Nadu, India: sheds light on extreme wave event signatures

Devi, Koravangatt; Lakshmi, C S; Raicy, M. C.; Srinivasan, P.; Murthy, S. G. N.; Hussain, S. M.; Buynevich, Ilya V.; Nair, R.R.

doi:10.1007/s11852-012-0228-x

Cited by 9 publications

(4 citation statements)

References 25 publications

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“…In zone II, the measured susceptibility of weak ferrimagnetic samples, in which calcium carbonate and silica or quartz are abundant, is reduced by diamagnetism. Depletion of magnetic susceptibility in zone II, matches the low values of magnetic susceptibility associated with quartz rich sand contents observed recently by Devi et al (2013) in the Nagapattinam coast. The magnetic susceptibility values in Nagapattinam beach sediments (Devi et al 2013), exhibit the same set of minerals and in similar concentrations.…”

Section: Magnetic Concentration Dependent Parameterssupporting

confidence: 87%

“…Depletion of magnetic susceptibility in zone II, matches the low values of magnetic susceptibility associated with quartz rich sand contents observed recently by Devi et al (2013) in the Nagapattinam coast. The magnetic susceptibility values in Nagapattinam beach sediments (Devi et al 2013), exhibit the same set of minerals and in similar concentrations. Thus, paramagnetic minerals (transfer of these minerals from the beach area had taken place during the backwash of huge tsunami waves) have contributed significantly to the magnetic susceptibility in zone II sediment samples.…”

Section: Magnetic Concentration Dependent Parameterssupporting

confidence: 87%

“…Numerical simulation model (using DHI-MIKE software) results for sediment transport during tsunami, showed the total load transport is higher towards the offshore region of Tamil Nadu coast (Jayakumar 2012). The similarity in depositional event in the land area of Nagapattinam as reported by Srinivasalu et al (2009) and Devi et al (2013) can be correlated with the sample in the offshore region, which is due to the return flow of tsunami wave, and the distinct subsequent layers (Goff et al 2004). The recent study of Elakkiya et al (2013) also describes the assemblage of foraminifera, ostracoda, and their distribution (species including Ammonia beccarii, Globigerina bulloides, Quinqueloculina sp., Spiroloculina orbis, Propontocypris bengalensis, Propontocypris crocata and Phlyctenophora orientalis) in the study area (Nagapattinam), suggesting that these species have been brought by the high energy tsunami waves (2004 IOT deposit).…”

Section: Sediment Texture and Mineralogical Distributionmentioning

confidence: 62%

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Identification and characterization of tsunami deposits off southeast coast of India from the 2004 Indian Ocean tsunami: Rock magnetic and geochemical approach

et al. 2014

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Indian Ocean Tsunami (IOT) had a major impact on the geomorphology and sedimentology of the east coast of India. Estimation of the magnitude of the tsunami from its deposits is a challenging topic to be developed in studies on tsunami hazard assessment. Two core sediments (C1 and C2) from Nagapattinam, southeast coast of India were subjected to textural, mineral, geochemical and rock-magnetic measurements. In both cores, three zones (zone I, II and III) have been distinguished based on mineralogical, geochemical and magnetic data. Zone II is featured by peculiar rockmagnetic, textural, mineralogical and geochemical signatures in both sediment cores that we interpret to correspond to the 2004 IOT deposit. Textural, mineralogical, geochemical and rock-magnetic investigations showed that the tsunami deposit is featured by relative enrichment in sand, quartz, feldspar, carbonate, SiO 2 , TiO 2 , K 2 O and CaO and by a depletion in clay and iron oxides. These results point to a dilution of reworked ferromagnetic particles into a huge volume of paramagnetic materials, similar to what has been described in other nearshore tsunami deposits (Font et al. 2010). Correlation analysis elucidated the relationships among the textural, mineral, geochemical and magnetic parameters, and suggests that most of the quartz-rich coarse sediments have been transported offshore by the tsunami wave. These results agreed well with the previously published numerical model of tsunami induced sediment transport off southeast coast of India and can be used for future comparative studies on tsunami deposits.

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Section: Magnetic Concentration Dependent Parameterssupporting

confidence: 87%

Section: Magnetic Concentration Dependent Parameterssupporting

confidence: 87%

Section: Sediment Texture and Mineralogical Distributionmentioning

confidence: 62%

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Identification and characterization of tsunami deposits off southeast coast of India from the 2004 Indian Ocean tsunami: Rock magnetic and geochemical approach

et al. 2014

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“…Table 2 also highlights that a more consistent feature of tsunami events is that their deposits can generally be traced further inland and to a higher elevation than those of storms (Dawson and Stewart, 2007;Dawson, 1999;Devi et al, 2013;Smith et al, 2007;Bourgeois, 2009;Chagué-Goff et al, 2002;Kortekaas and Dawson, 2007;Goff et al, 2012), though storms are recorded as throwing large boulders onto cliff tops >35m ODM on Ireland's western coasts (Carter 1988;Williams and Hall, 2004;Williams, 2010;Jeffers, 2007;Scheffers et al, 2010;O'Brien et al, 2013;Dewey and Ryan, 2017). Due to the magnitude of energy and wave hydrodynamics of tsunamis, the associated wave run-up is able to reach progressively higher elevations onshore before terrain frictional and water volume loss factors lead to the dissipation of the wave (Foster et al, 1991).…”

Section: Summary Of the Key Characteristics Of Tsunami Event Depositsmentioning

confidence: 88%

Investigation of an Elevated Sands Unit at Tralispean Bay, South-West Ireland – Potential High Energy Marine Event

Cronin,

Devoy,

Bartlett

et al. 2019

IrishGeog

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A sequence of high elevation sands containing both broken and whole marine shells, as well as many mega-sized, raft-shaped boulders (1-3m across) has been discovered at Tralispean Bay, West Cork, Ireland. Ground-Penetrating Radar (GPR), ground surveying and differential GPS (dGPS) show that the sediments cover an area of c.0.75ha, reaching a maximum height of c.+18.5m ODM, with interconnected pockets of sand varying in thickness of up to 1m. Coring, lithostratigraphic study, granulometry, organics loss-on-ignition and carbonate content analyses, together with examination of micro- and macrofossils, indicate that the shelly sands were deposited rapidly, under high energy conditions. Informal interviews with local residents, as well as the extent of the sands, suggest that the deposit is not the result of human actions. Elevations reached by the sediments, the presence of mega-boulders, and other indicators make it unlikely that these sediments arose from storm activity. It is possible that they have been deposited as the result of a tsunami. The radiocarbon (AMS) date obtained places the age of such an event at 1465 AD (Cal BP 485). At present, no clear historical record has been identified of any tsunami impacts affecting the south coast of Ireland other than the Lisbon earthquake of 1755.

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GPR studies over the tsunami affected Karaikal beach, Tamil Nadu, south India

et al. 2014

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In 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.

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Integrated approach of assessing sedimentary characteristics of onshore sand deposits on the Velankanni coast, Tamil Nadu, India: sheds light on extreme wave event signatures

Cited by 9 publications

References 25 publications

Identification and characterization of tsunami deposits off southeast coast of India from the 2004 Indian Ocean tsunami: Rock magnetic and geochemical approach

Identification and characterization of tsunami deposits off southeast coast of India from the 2004 Indian Ocean tsunami: Rock magnetic and geochemical approach

Investigation of an Elevated Sands Unit at Tralispean Bay, South-West Ireland – Potential High Energy Marine Event

GPR studies over the tsunami affected Karaikal beach, Tamil Nadu, south India

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