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<p>The southeastern coast of India, between Pondicherry and Point Calimere, features a highly dynamic shoreline shaped by complex interactions between natural processes and human activities. This study provides a comprehensive assessment of shoreline changes over 48 years (1972–2020) across four tectonically distinct zones: Zone I (Pondicherry–Cuddalore), Zone II (Parangipettai), Zone III (Poompuhar), and Zone IV (Vedaranyam), using multi-temporal Landsat images and the Digital Shoreline Analysis System (DSAS). Shorelines were extracted using the High-Water Line (HWL) proxy, following rigorous preprocessing steps including geometric and radiometric corrections, tidal stage consideration, and positional uncertainty evaluation. Two statistical methods, End Point Rate (EPR) and Net Shoreline Movement (NSM), were used to measure long- and short-term changes, respectively. Results show significant spatial variation: Zone I remains mostly stable with localized erosion and accretion; Zone II is prone to erosion (47% by EPR, 49% by NSM); Zone III is strongly erosion-dominated (60% by EPR, 85% by NSM) with limited sediment supply; and Zone IV displays a near balance between accretion and erosion, influenced by shoreline orientation and current patterns. The combined analysis highlights the dominance of erosion in Zones II and III, the role of hydrodynamic forces in shaping spatial variability, and the need for zone-specific management approaches. This research underscores the importance of combining remote sensing, GIS, and DSAS based analysis for informed coastal management. It offers a decision-support framework for addressing shoreline instability along the Tamil Nadu coast.</p>

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Estimation of shoreline changes using digital shoreline analysis systems (DSAS 5.0) from Pondicherry to Point Calimere, Southeast Coast of India

  • 期刊论文

  • 发表日期：

    2026年3月13日

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  • Sathiyamoorthy Gunasekaran,
  • Vasudevan Sivaprakasam,
  • Selvaganapathi Rajendiran,
  • Balamurugan Palani,
  • Sivaranjan Periyasami

摘要

The southeastern coast of India, between Pondicherry and Point Calimere, features a highly dynamic shoreline shaped by complex interactions between natural processes and human activities. This study provides a comprehensive assessment of shoreline changes over 48 years (1972–2020) across four tectonically distinct zones: Zone I (Pondicherry–Cuddalore), Zone II (Parangipettai), Zone III (Poompuhar), and Zone IV (Vedaranyam), using multi-temporal Landsat images and the Digital Shoreline Analysis System (DSAS). Shorelines were extracted using the High-Water Line (HWL) proxy, following rigorous preprocessing steps including geometric and radiometric corrections, tidal stage consideration, and positional uncertainty evaluation. Two statistical methods, End Point Rate (EPR) and Net Shoreline Movement (NSM), were used to measure long- and short-term changes, respectively. Results show significant spatial variation: Zone I remains mostly stable with localized erosion and accretion; Zone II is prone to erosion (47% by EPR, 49% by NSM); Zone III is strongly erosion-dominated (60% by EPR, 85% by NSM) with limited sediment supply; and Zone IV displays a near balance between accretion and erosion, influenced by shoreline orientation and current patterns. The combined analysis highlights the dominance of erosion in Zones II and III, the role of hydrodynamic forces in shaping spatial variability, and the need for zone-specific management approaches. This research underscores the importance of combining remote sensing, GIS, and DSAS based analysis for informed coastal management. It offers a decision-support framework for addressing shoreline instability along the Tamil Nadu coast.