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Indications of an extreme event deposits along the west coast of India: evidences from GPR investigations

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Abstract

The ground-penetrating radar (GPR) was used to trace the subsurface details in the Palshet coastal zone (Maharashtra) as it exhibits an interesting array of geomorphological features. Furthermore, our main goal was to identify and locate features that might have formed during a reported extreme event and its effects on the flow of the nearby Sundri River. Two profiles (8 and 4 m depth) were collected across the beach and along the backshore, respectively. While the 8-m depth profile (west to east; across the beach) indicates a series of coastline regression in this area, the 4-m depth profile along the coastline (north to south) in the backshore zone reveals two significant incidents viz., (1) stages of development of the paleo-channels that indicate the migration of the Sundri River towards south and (2) huge sediment deposits up to 2.5-m thick in the backshore area. The erosional relict surface (~2.5 m depth) was traced along with various spells of sediments that perhaps occurred due to an extreme event. Sand samples were collected from two trial pits along the GPR profiles to understand the sedimentology and mineralogy in the backshore area. These data together with beach profiles and geomorphological maps suggest that the sands were deposited by an extreme event perhaps during the 1854 cyclonic storm. The sands were trapped in suitable geomorphological sites along the Palshet coast and these sand deposits of about 2.5 m thickness forced the River Sundri to shift its course towards the south. This new revelation facilitates a further study that could focus on the nearby coastal areas to document such extreme event deposits and their influence on the geomorphic set-up.

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Acknowledgments

The financial support from the Council of Scientific & Industrial Research, New Delhi through the Network Project (CMM 0023) is gratefully acknowledged. We thank the Directors of CSIR-CIMFR, CSIR-NIO and WIHG for permission to publish this paper. We appreciate the help rendered by Ms. Ruenna D’Souza and Ms. Dashimi Chari for analyzing the samples and secretarial assistance. We are grateful for the comments and suggestions by the reviewers which helped to revise the manuscript. We thank Professor Olaf Kolditz and Dr. Gunter Doerhoefer, Editor-in-Chief for encouraging us to submit the revised version of the manuscript.

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Loveson, V.J., Gujar, A.R., Iyer, S.D. et al. Indications of an extreme event deposits along the west coast of India: evidences from GPR investigations. Environ Earth Sci 72, 4155–4166 (2014). https://doi.org/10.1007/s12665-014-3311-9

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