Remote sensing and GIS-based Seashore changes of Tuticorin Zone and Punnaikayal Zone in parts of Thoothukudi Coast, Tamil Nadu, India
Abstract
Urban coast and Estuary have significant modification as erosion and accretion due to both natural and human intervention. The study was carried out in Tuticorin and Punnaikayal zones in part of Thoothukudi coast from 1968 to 2018. For a detailed study, these zones further divided into three sub-zones, namely as A to F. The SOI Toposheet used for marking the shoreline for the year 1968. The Seashore lines digitised with FCC of Satellite imagery in ArcGIS platform using preprocessed Landsat TM Satellite imagery of 1997 and 2018. Finally, Shoreline changes are measured and analysed by overlay analysis for finding the amount of erosion and accretion between the periods 1968 – 1997 and 1997 – 2018. The findings reveal that in both the zones, more accretion has noticed during the period 1968 -1997. However, the accretion process has reduced during the period 1997 – 2018. In Tuticorin zone, the accretion was reduced from 2.40 km2 to 1.14 km2 with the growth rate from 69.63 m2/year to 54,41 m2/year. In Punnaikayal zone, the amount of accretion is reduced from 1.23 km2 to 0.04 km2 with the growth rate decreased from 42,52 m2/year to 1,81 m2/year. The result concludes that an accretion process reduced and in turn erosion process increased in the coastal region.
