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Characterizing cross-sectional morphology and channel inefficiency of lower Bhagirathi River, India, in post-Farakka barrage condition

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Abstract

The present research based on 39 cross sections, historical maps, satellite images, and intensive field investigations intends to portray the changes in the cross-sectional morphology and channel efficiency of the lower Bhagirathi River (Katwa to Nabadwip) after the Farakka barrage was constructed over the Ganga River in 1975. The study reveals that majority of the cross sections have undergone significant changes in terms of higher width/depth ratio (1972:71.4 and 1984:85.1), higher channel form index (1972:28.06, 1984:33.44), and higher areal asymmetry (1972:0.244, 1984:0.287). Thus, discriminant analysis based on the principal component analysis Z-score of the derived indices shows a reversal of the quadrant reflecting a definite change in cross-sectional morphology in the post-Farakka barrage condition. Though the Reynolds number and specific stream power increased due to the increase in the lean period (January to May) discharges by the controlled hydrology, channel efficiency has decreased which is reflected through the higher Chezy roughness factor (1972:0.095 and 1984: 6.802) and increasing braiding index (1994:0.103, 2019:0.294). This is due to the emergence of the transport-limited condition triggered by the inadequate discharge compared to the huge sediment load contributed by Bhagirathi bank erosion and the Ajay–Mayurakshi system. Moreover, the role of erosion permitting sand and silt facies triggering higher channel oscillation along the left bank and presence of plug bar deposits coupled with the suspected attraction of subsurface fault are also noted on the relative stability and channel orientation of the middle part of the study reach.

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Acknowledgements

The authors are thankful to the unanimous reviewers for their valuable comments to improve the scientific appeal of the paper. Besides, the authors express their deep gratitude to Dr Sandipan Ghosh, Department of Geography, Chandrapur College, Barddhaman, India; Dr Balai Chandra Das, Department of Geography, Krishnagar Government College, Krishnanagar, India; Prof (Dr) Harendra Nath Bhattacharya, Department of Earth Sciences, Techno India University, Kolkata, India and Ex. Professor of Geology, Department of Geology, Presidency University, Kolkata and Ujwal Deep Saha, Department of Geography, Vivekananda College for Women, Kolkata, India for their valuable feedback and supplying some important literature to improve the manuscript. Moreover, we convey our sincere thanks to beloved students Mr. Suman Deb Barman, Md. Mofizul Hoque and Ms. Susmita Ghosh for cooperating to prepare few figures.

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  1. Department of Geography, Aliah University, 17 Gorachand Road, Kolkata, 700 014, India

    Aznarul Islam

  2. Department of Geography, The University of Burdwan, Barddhaman, 713 104, India

    Sanat Kumar Guchhait

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  1. Aznarul Islam
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Correspondence to Aznarul Islam.

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Islam, A., Guchhait, S.K. Characterizing cross-sectional morphology and channel inefficiency of lower Bhagirathi River, India, in post-Farakka barrage condition. Nat Hazards 103, 3803–3836 (2020). https://doi.org/10.1007/s11069-020-04156-9

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