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The research on riverine hydrochemistry and controlling factors in the Danjiangkou Reservoir

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Abstract

The riverine dissolved solids, indicating the environment information in watersheds, generally originated from rock weathering, soil erosion and anthropogenic inputs etc. The hydro-chemical characteristics of Danjiangkou Reservoir and its influencing factors after the implementation of South-to-North Water Transfer Project were discussed, based on water quality investigation from October 2017 to July 2018. The water in Danjiangkou Reservoir was moderately alkalescent, with pH ranging from 7.02 to 8.58. The dissolved oxygen, oxidation–reduction potential and conductivity had showed obviously seasonal variations. The total dissolved solids average was 176.14 ± 15.98 mg/L, which was much higher than that average of main rivers in the world. The Ca2+ concentration was the highest among cationic composition, accounting for 50% to 70% of total cations. Among the anion composition, \({\text{HCO}}_{3}^{ - }\) concentrations accounted for more than 70% in most sampling points. Researches showed that carbonates weathering had contributed 70.1% of chemical compositions and mainly controlled the hydro-chemical characteristics. Some riverine ions were affected by silicates weathering. The 17.75% of chemical species were released into rivers by anthropogenic inputs, which proved to be the important factors affecting riverine chemical characteristics, especially in the wet season.

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Acknowledgements

This research were financially supported by Fundamental Research Funds for Gentral Public Welfare Research Institutes (Grant No. CKSF2017027/CQ; Grant No. CKSF2019413/CQ; Grant No. CKSF2019185/TB), Opening Project of Ministry of Land and Resources/Key Laboratory of Karst Dynamics in Guangxi (KDL201707), and Natural Science Foundation of Chongqing (cstc2018jcyjAX0479).

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Authors and Affiliations

  1. Chongqing Branch Institute, Changjiang River Scientific Research Institute, Chongqing, 400026, China

    Qianzhu Zhang, Huoming Zhou, Yang Lu, Ke Jin & Jinsong Shi

  2. College of Architecture and Urban Planning, Chongqing Jiaotong University, Chongqing, 400074, China

    Ruiyi Zhao

  3. Key Laboratory of Karst Dynamics MLR&GZAR, Institute of Karst Geology, CAGS, Guilin, 541004, China

    Ruiyi Zhao

  4. Changjiang Water Resources Commission, Changjiang River Scientific Research Institute, Wuhan, 430010, China

    Wenfeng Ding

  5. Geography and Planning School of Sun Yat-Sen University, Guangdong Provincial Key Laboratory for Urbanization and Geo-Simulation, Guangzhou, 510275, China

    Haojun Deng

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  1. Qianzhu Zhang
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Zhang, Q., Zhou, H., Lu, Y. et al. The research on riverine hydrochemistry and controlling factors in the Danjiangkou Reservoir. J Radioanal Nucl Chem 324, 507–519 (2020). https://doi.org/10.1007/s10967-020-07096-7

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