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Analysis of hydrological alteration and environmental flow in Sone river basin

  • Research Article - Hydrology
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Abstract

Environmental flow is an important indicator of river health as it maintains the natural flow pattern of riverine ecosystem. Although numerous researches for analyzing the hydrological alterations are there, still insightful investigation of site specific knowledge should be required for riverine ecosystem protection. In this study, the objective is to analyze the hydrological status of the Sone river basin in Bihar region, India. This study also focuses to develop a flow duration curve (FDC) to show the time duration–frequency of low-flow events. The hydrological status of the basin was analyzed using indicators of hydrologic alteration (IHA). Low flows were estimated using period of record flow duration curve (POR FDC), and design environmental flow was assessed for 10-year and 100-year return period using stochastic flow duration curve (stochastic FDC). Daily discharge data collected from Koelwar station of Sone river for 1990–2020 period were used for the hydrological analysis. Depending on the quantitative and qualitative assessment of the hydrological alterations, it was found that the hydrological status of the river basin is in a "very altered" state. The POR FDC analyzed 7-day mean discharge values (7dQ) appropriate for determining low flows, and discharge values corresponding to 95% probability of exceedance (Q95) were considered as low flow for 7dQ. Stochastic FDCs generated 7-day mean flow duration curves for 10-year (7Q10) and 100-year (7Q100) recurrence intervals. Discharge values corresponding to 95% probability of exceedance for 7Q10 range from 120 to 125 cumec and those for 7Q100 range from 135 to 140 cumec. The methodology proposed in this work to design environmental flow considering the effects of hydrological alteration can help in making the long-term strategies to protect the riverine ecosystem in Sone river basin.

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Acknowledgements

The authors would like to thank the CWC Patna for providing the data to carry out the analysis for the research work.

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Authors and Affiliations

  1. Department of Civil Engineering, National Institute of Technology Patna, Patna, Bihar, 800005, India

    Ankit Ranjan & Thendiyath Roshni

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  1. Ankit Ranjan
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  2. Thendiyath Roshni
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Contributions

AR was responsible for writing the original draft, formal analysis, methodology, validation, investigation, data curation, conceptualization and supervision. RT was involved in conceptualization, supervision and project administration.

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Correspondence to Thendiyath Roshni.

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The authors state that they have no known competing financial interests or personal ties that could have influenced the research presented in this study.

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Edited by Prof. Stefano Pagliara (ASSOCIATE EDITOR) / Dr. Michael Nones (CO-EDITOR-IN-CHIEF).

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Ranjan, A., Roshni, T. Analysis of hydrological alteration and environmental flow in Sone river basin. Acta Geophys. 71, 949–960 (2023). https://doi.org/10.1007/s11600-022-00946-w

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