Shoreline Changes from Mahabalipuram to Odiyur Lake Using Digital Shore Line Analysis System

Objectives: To examine the recent shoreline changes in the East coast of Tamil Nadu, India. Method: The current data set includes an evaluation of the morphological changes of the shoreline in the Indian state of Tamil Nadu, from Mahabalipuram to Odiyur Lake coastal stretch, using satellite images and DSAS (Digital Shoreline Analysis System) during a 17-year period. The research assesses the level of erosion and accretion along the coastline by utilizing statistical metrics, including EPR (End Point Rate) and NSM (Net Shoreline Movement). Five hundred sixty-one transects were created to assess shoreline changes over three coastal segments. Findings: The results reveal that the area between Kadalur Periya Kuppam and Kalpakkam underwent significant erosion, with peak rates of 7.5 meters per year and a coastal retreat of up to 119 meters. Conversely, sections from Odiyur to Mugaiyur and Kalpakkam to Mahabalipuram exhibited moderate to minimal erosion, with indications of accretion in particular areas. Novelty/Importance: The dataset demonstrates spatial variability affected by geomorphological characteristics and climatic disturbances, including cyclones. This study provides critical data for planners and policymakers to inform sustainable coastal management and erosion reduction in vulnerable shoreline areas. Keywords: Shore line changes, Digital Shoreline Analysis System, End point Rate, Net Shoreline Movement