Abstract
Shoreline changes along the north of the Konkan coast (Sindhudurg, Ratnagiri and Raigad) are studied using integrated remote sensing and geographic information systems techniques. The shorelines from 1990 to 2018 (28 yrs) and statistical methods like weighted linear regression (WLR) and end point rate (EPR) were used in estimating the shoreline changes. About 262 km of the study area is rocky with numerous headlands, rocky terraces and cliffs. In the analysis, notable shoreline changes of more than ±0.5 my−1 are witnessed in the 34 headland-bound pocket beaches of the study area. From 1990 to 2018, the pocket beaches of Sindhudurg district in the south exhibit an accretion trend while beaches of Ratnagiri and Raigad district in the north show erosion trends. The erosion percentage along these beaches increased from 5% in Sindhudurg district to 14% and 32% in Ratnagiri and Raigad districts.On some of the beaches like Vengurla, Mirya, Harihareshwar and Srivardhan, erosion at the rate of −0.5 to −3 my−1 is witnessed. To understand the decadal and quaternary shoreline changes in the pocket beaches, a short term shoreline change analysis was performed at different time frames like 1990–2000, 2000–2006, 2006–2012 and 2012–2018. From 1990 to 2000, accretion and stable conditions are seen dominant in the study area. But from 2000 to 2006, erosion is seen to increase along the beaches. In the years 2006–2012 and 2012–2018, alternating pockets of erosion, accretion and stable conditions are seen on the beaches. The erosion trend has been dominant on the beaches of the Sindhudurg district from 2012 to 2018. Erosion trend is observed continuously on a few pocket beaches like Vetye, Mirya, Anjarle, Srivardhan and Aravi. In this study, it is understood that headlands largely control the shoreline changes along the study area and wave dynamics prevalent in the stretch and recent developments along the coast like port, harbour, and groin cause shoreline changes.
Research highlights
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Monitoring and assessment of shoreline changes in the north Konkan sector for almost three decades from 1990 to 2018. In the analysis, the pocket beaches of Sindhudurg district in the south exhibit an accretion trend, while beaches of Ratnagiri and Raigad district in the north show erosion trends.
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Shoreline dynamics of pocket beaches flanked by headlands were monitored at different periods, viz., 1990–2000, 2000–2006, 2006–2012 and 2012–2018. The erosion trend is seen increasing in the study area from 2012 to 2018.
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Few of the pocket beaches like Vetye, Mirya, Anjarle, Srivardhan and Araviexhibitcontinuous erosion.
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The influence of natural headlands and anthropogenic factors inshoreline change.
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Acknowledgements
This work is part of Coastal Processes & Shoreline Management (CP&SM), NCCR. The authors would like to thank the Secretary, Ministry of Earth Sciences, Government of India. The authors sincerely thank Director NCCR and CP&SM team members for their keen interest and encouragement in this work.
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Padmini Gunasekaran: Conceptualisation, methodology, writing original draft and interpretation of the results. R S Kankara: Overall supervision, conceptualisation and interpretation of the results. Chenthamil Selvan Sekar: Reviewing, interpretation of the results and editing.
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Gunasekaran, P., Kankara, R.S. & Selvan, S.C. Map** shoreline changes of the pocket beaches using Remote Sensing and GIS – A study in the north Konkan sector, west coast of India. J Earth Syst Sci 131, 209 (2022). https://doi.org/10.1007/s12040-022-01945-7
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DOI: https://doi.org/10.1007/s12040-022-01945-7