Abstract
Suspended sediment load (SSL) and discharge are closely related concepts that characterise the sediment movement and quantity within water bodies and play a crucial role in evaluating the impact of erosion, sedimentation, and land management practices on riverine ecosystems. Despite numerous studies on SSL and discharge assessments, a site-specific understanding remains essential for effective riverine ecosystem protection. This study integrates daily sediment and discharge data from the Koelwar station spanning June 2010 to May 2015, with a primary focus on analysing SSL variability relative to Sone River discharge in Bihar. SSL–discharge rating curves were computed to assess concentration shifts during low flow season (LFS), high flow season (HFS), and the annual period. Results indicate a nearly linear dependence of SSL on discharge, with r2 values of 0.72, 0.94, and 0.84 for LFS, HFS, and the annual period, respectively. The study unveils the underlying mechanics driving catchment erosion and sediment transport during lean and peak flows through hysteresis loops. Findings reveal that 50% of events are influenced by shear stress and hydraulic forces from the channel bed, 20% by sediment depletion in the channel bed due to repeated peak flows, and the remaining 30% by a combination of shear stress and sediment reduction. Additionally, MATLAB-utilized wavelet analysis explains the time-frequency variability of discharge and SSL. Cross-wavelet analysis shows the outflow of SSL closely following discharge, indicating synchronisation across all scales. The study underscores the importance of effectively managing runoff events to mitigate SSL. The proposed methodology and results offer valuable insights for water management and policymakers, aiding in the formulation of guidelines to minimise anthropogenic activities and sustain aquatic ecosystems.
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The authors are thankful to the Central Water Commission (CWC), Patna, for providing the necessary data to carry out this research work.
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Ankit Ranjan: Writing – original draft, formal analysis, methodology, validation, investigation, and data curation, conceptualisation, supervision. Thendiyath Roshni: Conceptualisation, supervision, and project administration.
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Ranjan, A., Roshni, T. Potential variability of discharge and suspended sediment load in the Sone River basin, Bihar. J Earth Syst Sci 133, 62 (2024). https://doi.org/10.1007/s12040-024-02292-5
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DOI: https://doi.org/10.1007/s12040-024-02292-5