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River response to active tectonics: a study of channel migration and land loss in the lower reaches of Bhagirathi in Murshidabad district, West Bengal, India

Author

Listed:
  • Sambuddha Mukherjee

    (Geological Survey of India, Eastern Region)

  • Sayani Khan

    (Geological Survey of India, Eastern Region)

  • Anindita Chakraborty

    (Geological Survey of India, EPMA Laboratory, Central Headquarters)

  • Jayati Ray

    (Geological Survey of India, Eastern Region)

  • Niva Brahma

    (Geological Survey of India, Eastern Region)

  • Antara Hazra

    (Geological Survey of India)

Abstract

The Bhagirathi River is historically prone to river bank erosion and slope failure. In Murshidabad District of West Bengal, India, the Bhagirathi River has shown significant changes in its river course over time with particular changes to its meandering nature. Through this study the authors have investigated the geomorphic causes from satellite imagery for such changes and have also found evidences of neotectonic activity in the area through field observations and geophysical studies. The study area is within the Bengal Basin and outcrops are not visible on the surface due to thick alluvium cover and thus there is no direct structural control visible on the surface that might indicate active tectonism. Comparison of different sets of aerial photographs and satellite images for the past 50 years have been carried out to track changes to the Bhagirathi River course along with calculation of geomorphic indices such as Basin Asymmetry Factor, Stream Length-gradient Index and Transverse Topographic Symmetry Factor to identify any tectonic activity in the area. We have also calculated sinuosity index and radius of curvature for multiple bends of the Bhagirathi River in the study area to have a comprehensive overview of the changes in river course. Bathymetry data and current velocity/direction measurements along with field evidences show the presence of a NE-SW trending lineament near Basabari-Shujapur village. This lineament is found to be tectonically active based on geophysical data and observation of soft sediment deformation structures in field. Our study indicates that the changes in the course of the Bhagirathi River are tectonically controlled.

Suggested Citation

  • Sambuddha Mukherjee & Sayani Khan & Anindita Chakraborty & Jayati Ray & Niva Brahma & Antara Hazra, 2025. "River response to active tectonics: a study of channel migration and land loss in the lower reaches of Bhagirathi in Murshidabad district, West Bengal, India," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 121(11), pages 13267-13294, June.
    • Handle: RePEc:spr:nathaz:v:121:y:2025:i:11:d:10.1007_s11069-025-07348-3
    DOI: 10.1007/s11069-025-07348-3
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    References listed on IDEAS

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    1. Hesham Abd-El Monsef & Scot Smith & Kamal Darwish, 2015. "Impacts of the Aswan High Dam After 50 Years," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 29(6), pages 1873-1885, April.
    2. Bela Das, 2011. "Stakeholders’ perception in identification of river bank erosion hazard: a case study," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 58(3), pages 905-928, September.
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