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<p>Coastal regions, particularly deltaic environments, undergo constant transformation due to natural processes and human activities. The Sundarbans Delta, situated at the confluence of the Ganga–Brahmaputra-Meghna (GBM) river system and the Bay of Bengal, plays a vital ecological and socio-economic role. However, climate change and anthropogenic pressures increasingly threaten this globally significant ecosystem. Sagar Island, the largest inhabited island in the Indian Sundarbans, faces challenges from sea-level rise (SLR), sediment supply disruptions, and frequent cyclonic events. In this study, we analyzed the shoreline change dynamics of Sagar Island over a 24-year period (2000–2024) to identify spatial and temporal patterns of erosion and accretion. Landsat satellite imagery with a spatial resolution of 30&#xa0;m was used along with three statistical metrics, Net Shoreline Movement (NSM), End Point Rate (EPR), and Weighted Linear Regression (WLR), to quantify coastal change. The analysis revealed extensive erosion along the southern and south-western coasts, driven by high wave energy, tidal action, and cyclonic disturbances, with NSM values confirming significant land loss. Conversely, the northern coastline exhibited localized accretion primarily influenced by sediment deposition from the Hooghly River. The findings demonstrate the combined effects of natural forces and human interventions on Sagar Island’s shoreline. We recommend mangrove restoration, sediment management, and community-based adaptation measures to mitigate erosion and enhance resilience. This research advances understanding of deltaic shoreline dynamics and offers practical insights for sustainable development in vulnerable coastal regions.</p>

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Assessing shoreline change dynamics of Sagar Island, Indian Sundarban: a 24-year analysis using geospatial techniques

  • 期刊论文

  • 发表日期：

    2025年12月3日

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  • Chandra Shekhar Dwivedi,
  • Manali Santra,
  • Arvind Chandra Pandey,
  • Debashis Mitra

摘要

Coastal regions, particularly deltaic environments, undergo constant transformation due to natural processes and human activities. The Sundarbans Delta, situated at the confluence of the Ganga–Brahmaputra-Meghna (GBM) river system and the Bay of Bengal, plays a vital ecological and socio-economic role. However, climate change and anthropogenic pressures increasingly threaten this globally significant ecosystem. Sagar Island, the largest inhabited island in the Indian Sundarbans, faces challenges from sea-level rise (SLR), sediment supply disruptions, and frequent cyclonic events. In this study, we analyzed the shoreline change dynamics of Sagar Island over a 24-year period (2000–2024) to identify spatial and temporal patterns of erosion and accretion. Landsat satellite imagery with a spatial resolution of 30 m was used along with three statistical metrics, Net Shoreline Movement (NSM), End Point Rate (EPR), and Weighted Linear Regression (WLR), to quantify coastal change. The analysis revealed extensive erosion along the southern and south-western coasts, driven by high wave energy, tidal action, and cyclonic disturbances, with NSM values confirming significant land loss. Conversely, the northern coastline exhibited localized accretion primarily influenced by sediment deposition from the Hooghly River. The findings demonstrate the combined effects of natural forces and human interventions on Sagar Island’s shoreline. We recommend mangrove restoration, sediment management, and community-based adaptation measures to mitigate erosion and enhance resilience. This research advances understanding of deltaic shoreline dynamics and offers practical insights for sustainable development in vulnerable coastal regions.