January - February 2020 ISSN: 0193-4120 Page No. 16844 - 16852 16844 Published by: The Mattingley Publishing Co., Inc. Remote sensing and GIS-based Seashore changes of Tuticorin Zone and Punnaikayal Zone in parts of Thoothukudi Coast, Tamil Nadu, India Sudhakar V 1 , Gurugnanam B 2 , Bairavi S 3 ,Sorna Chandra Devadass C 4 1,2,3 Centre for Applied Geology, The Gandhigram Rural Institute – Deemed to be University, Dindigul, Tamil Nadu, India 4 Department of Civil Engineering, Samskruti College of Engineering and Technology, Ghatkesar, Hyderabad, India. Article Info Volume 82 Page Number: 16844 - 16852 Publication Issue: January - February 2020 Article History Article Received: 18 May 2019 Revised: 14 July 2019 Accepted: 22 December 2019 Publication: 29 February 2020 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 km 2 to 1.14 km 2 with the growth rate from 69.63 m 2 /year to 54,41 m 2 /year. In Punnaikayal zone, the amount of accretion is reduced from 1.23 km 2 to 0.04 km 2 with the growth rate decreased from 42,52 m 2 /year to 1,81 m 2 /year. The result concludes that an accretion process reduced and in turn erosion process increased in the coastal region. Keywords—Erosion, Accretion, Net growth, Growth rate I. INTRODUCTION Seashore line changes affects the coastal livelihood and economic conditions and land management, and also it controls the environment [1]-[2]. The coastline is one of the most significant straight highlights on the world's surface, which has a powerful nature [23]. Natural and geological phenomena, sediment transportation and sea-level rise, will cause the seashore line directly [3]. Coastal zones are the world’s most diverse and productive environments. Seaside territories additionally incorporate complex biological systems, for example, coral reefs, mangroves, sandy seashores and ocean grass [22]. One of the essential requirements of coastal protection planning work is to understand the coastal processes of erosion, deposition and sediment transport, flooding and sea- level changes that continually alter the coastline [23]. The sandy beaches were exposed more for the erosion, and accretion activities. Waves, currents, and tides also contributed to the shoreline erosion and accretion process. The researchers analyzed the trends in waves with respect to erosion and accretion studies in the Arabian Sea, Bay of Bengal and also in the northern Indian Ocean [4]-[5], using historical satellite data- based seashore line measurements [6]- [10], and validated by many scholars [11]-[12]. Shoreline changes are a great concern in the estuaries [13]- [16]. Sediment transportation through littoral current