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      https://www.ias.ac.in/article/fulltext/jess/124/06/1293-1309

    • Keywords

       

      Son River; Ganga basin; hydrogeochemistry; weathering; flux and denudation rates; water quality.

    • Abstract

       

      River Son, draining diverse lithologies in the subtropical climate of the peninsular sub-basin of the Ganga basin, is one of the major tributaries of the Ganga River. The chemistry of major ions in the surface water of the Son River was studied in detail to determine various source(s) and processes controlling its water chemistry, seasonal and spatial variations in water chemistry, dissolved fluxes and chemical denudation rate (CDR). The study shows that Ca2+, Mg2+ and HCO$^{-}_{3}$ are major ionic species in the river water. Most of the measured parameters exhibit a relatively lower concentration in the post-monsoon as compared to pre-monsoon season. The water chemistry highlights the influence of continental weathering aided by secondary contributions from ground water, saline/alkaline soils and anthropogenic activities in the catchment. Results also reflect the dominance of carbonate weathering over silicate weathering in controlling water composition. The Son River delivers about 4.2 million tons of dissolved loads annually to the Ganga River, which accounts for $\sim$6% of the total annual load carried by the Ganga River to the Bay of Bengal. The average CDR of the Son River is 59.5 tons km−2 yr−1, which is less than the reported 72 tons km−2 yr−1 of the Ganga River and higher than the global average of 36 tons km−2 yr−1. The water chemistry for the pre-monsoon and post-monsoon periods shows a strong seasonal control on solute flux and CDR values. The water chemistry indicates that the Son River water is good to excellent in quality for irrigation and also suitable for drinking purposes.

    • Author Affiliations

       

      Chinmaya Maharana1 Sandeep Kumar Gautam1 Abhay Kumar Singh2 Jayanth K Tripathi1

      1. School of Environmental Sciences, Jawaharlal Nehru University, New Delhi 110 067, India.
      2. Central Institute of Mining and Fuel Research, Barwa Road, Dhanbad, Jharkhand 826 001, India.
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  • Journal of Earth System Science | News

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