Abstract
Climate change impact on the environment makes the coastal areas vulnerable and demands the evaluation of such susceptibility. Historical changes in the shoreline positions and inundation based on projected sea-level scenarios of 0.5 and 1 m were assessed for Nagapattinam District, a low-lying coastal area in the southeast coast of India, using high-resolution Shuttle Radar Topography Mission data; multi-dated Landsat satellite images of 1978, 1991, 2003, and 2015; and census data of 2011. Image processing, geographical information system, and digital shoreline analysis system methods were used in the study. The shoreline variation indicated that erosion rate varied at different time scales. The end point rate indicated the highest mean erosion of − 3.12 m/year, occurred in 73% of coast between 1978 and 1991. Weighted linear regression analysis revealed that the coast length of 83% was under erosion at a mean rate of − 2.11 m/year from 1978 to 2015. Sea level rise (SLR) impact indicated that the coastal area of about 14,122 ha from 225 villages and 31,318 ha from 272 villages would be permanently inundated for the SLR of 0.5 and 1 m, respectively, which includes agriculture, mangroves, wetlands, aquaculture, and forest lands. The loss of coastal wetlands and its associated productivity will severely threaten more than half the coastal population. Adaptation measures in people participatory mode, integrated into coastal zone management with a focus on sub-regional coastal activities, are needed to respond to the consequences of climate change.
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Acknowledgements
The authors are thankful for the funding support from the National Innovations in Climate Resilient Agriculture (NICRA) project of Indian Council of Agriculture Research (ICAR). We would like to thank Mrs. P. Anandhi for her assistance in the work. Special thanks to two learned anonymous reviewers for the valuable inputs and comments.
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Jayanthi, M., Thirumurthy, S., Samynathan, M. et al. Shoreline change and potential sea level rise impacts in a climate hazardous location in southeast coast of India. Environ Monit Assess 190, 51 (2018). https://doi.org/10.1007/s10661-017-6426-0
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DOI: https://doi.org/10.1007/s10661-017-6426-0