Post-tsunami changes in the littoral environment along the southeast coast of India

Kumar, Shravan; Naik, Kumar; Ramanamurthy, M. V.; Ilangovan, D.; Gowthaman, R.; Jena, Basanta Kumar

doi:10.1016/j.jenvman.2007.01.050

Cited by 13 publications

(4 citation statements)

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“…The topography controls the sedimentation of tsunami deposits with the best preservation in depressions (Wassmer et al 2010). Various aspects of the 2004 IOT onshore deposits on the east and west coasts of India were reported by several researchers (Altaff et al 2005;Earnest et al 2005;Jayakumar et al 2005Jayakumar et al , 2008Kumaraguru et al 2005;Nagendra et al 2005;Neetu et al 2005;Narayan et al 2005;Srinivasalu et al 2009;Anilkumar et al 2006;Chaudhary et al 2006;Hussain et al 2006Hussain et al , 2010Mascarenhas 2006;Shanmugam 2006Shanmugam , 2012Yeh et al 2006;Babu et al 2007;Bahlburg and Weiss 2007;Mascarenhas and Jayakumar 2008;Pari et al 2008;Vijayalakshmi et al 2010;Jayakumar 2012). However, studies on offshore tsunami deposits in India are limited (Srinivasalu et al 2010;Jonathan et al 2012) and many case studies are necessary to develop a depositional model.…”

Section: Introductionmentioning

confidence: 96%

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: Introductionmentioning

confidence: 96%

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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“…Beyond the heavy toll on human lives, it caused an enormous environmental impact along east coast of India. Kalpakkam located in the south east coast of India is one of the areas affected by the tsunami Ilangovan et al (Ilangovan, Jayakumar, Gowthaman, Tirodkar, Ramana & Naik, 2005), Verma et al (Verma, Nair, Singh &Sasidhar, 2006), Kumar et al (Kumar, Naik, Ramanamurthy, Ilangovan, Gowthaman & Jena, 2008), Anandan and Sasidhar (Anandan & Sasidhar, 2008) leading to morphological changes, vegetation loss and loss of lives. Subsequently, extensive rehabilitation measures were taken up.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Changes in Beach Morphology due to Coastal Armoring

Anandan¹,

Kumar²

2021

EER

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The Tsunami, which struck the east coast of India on 26th December 2004, caused huge damage to life, property and environment. Beyond the heavy toll on human lives, it had caused an enormous environmental impact. Kalpakkam located in the south east coast of India is one of the areas affected by the tsunami. At some locations along the coast around Kalpakkam, morphological changes, vegetation loss and fatality were reported. Later, a slew of remedial measures were initiated at Kalpakkam in 2006 and construction of coastal armoring in the form of Tsunami Protection Wall (TPW) of 3.2 km length was one of them. A study was undertaken to assess the impact of this TPW on the surroundings based on periodic measurements of High Water Line (HWL) before and after construction of the wall. Also beach profiles were made at selected locations to observe seasonal changes in sedimentation pattern (i.e. accretion and erosion). As the residential area at Kalpakkam is located between fishing hamlets at northern and southern side, it is necessary to understand the impact of TPW, if any, in the surrounding area and on the fishing hamlets. Towards this assessment, high resolution satellite data such as Quickbird and IKONOS were employed (for the years 2002, 2003, 2009 and 2011) to measure the HWL. In addition, monthly beach profiles were carried out to measure the sedimentation pattern at selected transects with the help of N3 Precision Level survey instrument for the year 2009. The detailed investigations and analysis revealed no significant impact on the beach morphology and sedimentation patterns due to the construction of TPW, within the residential areas as well as at fishing hamlets. The average variations in the position of HWL along the coast was 4.6m and sedimentation changes were in the range of ≈ 0.5m in the berm of backshore region and ≈ 1.7m in the swash zone of the foreshore region all along the study area. No adverse effect is observed and the variations observed are similar to that in an unarmored control beach. The study provides the confidence that multi-dated satellite monitoring together with the profiling of beach would suffice the need for understanding the changes in the beach morphology due to the construction of beach armoring.

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“…Hitherto many recent studies in Andaman & Nicobar Islands (ANI) focused primarily on the assessment of the effect of 2004 tsunami (Ramachandran et al 2005;Ramanamurthy et al 2005;Belward et al 2007;Curran et al 2007;Jayakumar et al 2008;Prasad et al 2009a) and the anthropogenic impacts on LULC patterns of the Islands (Dharanirajan et al 2004;Nagabhatla et al 2006;Prasad et al 2009a). But there is a need for an integrated assessment to understand the interactions between the various processes based on its socio-economic and biophysical characterization to help in managing these fragile Island ecosystems.…”

Section: Introductionmentioning

confidence: 99%

A conceptual framework to analyse the land-use/land-cover changes and its impact on phytodiversity: a case study of North Andaman Islands, India

et al. 2010

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Phytodiversity is affected both by natural and anthropogenic factors and in Island ecosystems these impacts can devastate or reduce diversity, if the native vegetation is lost. In addition to rich species richness and diversity, Island systems are the sites of high endemism and any threat to these ecosystems will consequently lead to loss and extinction of species. To understand the dynamics including feedbacks of these changes in phytodiversity of North Andaman Islands, a conceptual framework is proposed which focuses on understanding the land-use and land-cover changes and its impact with phytodiversity. In considering land-use and land-cover changes this work highlights the direct and indirect drivers of changes-socio-economic, biophysical and climatic factors. Migration of population, their socio economic needs and government policies were identified as major driving forces threatening the phytodiversity of these Islands. Apart from human beings, natural disasters like tsunami and introduced herbivorous animals like elephants also contributed to forest destruction in these Islands. The integrated analysis based on such framework will provide insights for holistic resource management including ecological conservation.

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Post-tsunami changes in the littoral environment along the southeast coast of India

Cited by 13 publications

References 4 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 Changes in Beach Morphology due to Coastal Armoring

A conceptual framework to analyse the land-use/land-cover changes and its impact on phytodiversity: a case study of North Andaman Islands, India

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