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Geospatial analysis of shoreline changes along the Pondicherry and Vedaranyam coast, east coast of Tamil Nadu, India

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Author Affiliations

  • 1Department of Earth Sciences, Annamalai University, Tamil Nadu, India
  • 2Department of Earth Sciences, Annamalai University, Tamil Nadu, India
  • 3Department of Earth Sciences, Annamalai University, Tamil Nadu, India
  • 4Department of Earth Sciences, Annamalai University, Tamil Nadu, India

Int. Res. J. Earth Sci., Volume 5, Issue (3), Pages 1-10, April,25 (2017)

Abstract

Shoreline change study was carried out for the 243km long stretch of Pondicherry and Vedaranyam coast. IRS-1C Liss-III (2012), STRM (2000) Satellite images and Survey of India toposheets for the years 1970 input dataset. A field survey was also carried out using GPS instrument for 2014. One method i.e. Linear Regression Rate (LRR), were working to calculate shoreline change rate for 1970 to2012. While Linear Regression Rate method is used to work out the Long-term analysis for 1970-2012. Totally 45 transects were generated with 50m spacing and the length of each transect was 200m. From the Long-term analysis, the overall erosion change was -2.80 m/yr and accretion 1.88 m/yr during the period of 1970 to 2012. From the analysis, it clearly shows that the assessment of shoreline change rates showed a trend of shoreline erosion and accretion. Most of the beach underwent erosion while some part of the beach accretion through the study period. The observed patterns of the erosion and accretion along the central Tamil Nadu coast resulted from both natural and human impacts. Most of the shoreline was exposed to natural shoreline phenomena such as waves, tides and periodic storm surges apart from the coastal tectonics activities.

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