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<p>Shoreline extraction and change detection are essential for understanding coastal dynamics, particularly in regions vulnerable to tidal forces and sea-level rise. Recent advancements in geospatial technologies have enabled precise shoreline mapping and effective monitoring of temporal changes, offering valuable insights into the interactions between fluvial and marine processes. These tools are particularly suitable for studying dynamic coastal systems such as the Indian Sundarbans. This paper presents a comprehensive evaluation of morphological changes on Bulcherry Island, a relatively lesser-known, uninhabited, and ecologically rich island located at the southernmost tip of the Indian Sundarbans Delta, over a 24-year period (2000–2024). The long-term shoreline evolution of the island was analyzed using three robust statistical metrics—Net Shoreline Movement (NSM), End Point Rate (EPR), and Linear Regression Rate (LRR)—calculated through the Digital Shoreline Analysis System (DSAS v5.0). The results reveal significant erosion, particularly along the southern and south-eastern boundaries, with 70% of transects showing landward movement of the shoreline at an average retreat rate of 11.55&#xa0;m per year. These findings highlight the critical influence of the island’s low elevation, the upward trend of sea level rise, the frequent passage of tropical cyclones and reduced sediment discharge from the upstream Ganga River as primary drivers of rapid coastal degradation.</p>

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Confluence-driven coastal erosion and morphological changes in bulcherry island: a geospatial study in the Indian Sundarbans

  • 期刊论文

  • 发表日期：

    2025年11月4日

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  • Manali Santra,
  • Chandra Shekhar Dwivedi,
  • Arvind Chandra Pandey,
  • Bikash Ranjan Parida,
  • Manoranjan Mishra

摘要

Shoreline extraction and change detection are essential for understanding coastal dynamics, particularly in regions vulnerable to tidal forces and sea-level rise. Recent advancements in geospatial technologies have enabled precise shoreline mapping and effective monitoring of temporal changes, offering valuable insights into the interactions between fluvial and marine processes. These tools are particularly suitable for studying dynamic coastal systems such as the Indian Sundarbans. This paper presents a comprehensive evaluation of morphological changes on Bulcherry Island, a relatively lesser-known, uninhabited, and ecologically rich island located at the southernmost tip of the Indian Sundarbans Delta, over a 24-year period (2000–2024). The long-term shoreline evolution of the island was analyzed using three robust statistical metrics—Net Shoreline Movement (NSM), End Point Rate (EPR), and Linear Regression Rate (LRR)—calculated through the Digital Shoreline Analysis System (DSAS v5.0). The results reveal significant erosion, particularly along the southern and south-eastern boundaries, with 70% of transects showing landward movement of the shoreline at an average retreat rate of 11.55 m per year. These findings highlight the critical influence of the island’s low elevation, the upward trend of sea level rise, the frequent passage of tropical cyclones and reduced sediment discharge from the upstream Ganga River as primary drivers of rapid coastal degradation.