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Influence of Dissolved Oxygen and Temperature on Nitrogen Transport and Reaction in Point Bars of River

Author

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  • Xunchuan Song

    (Key Laboratory of Intelligent Health Perception and Ecological Restoration of Rivers and Lakes, Ministry of Education, Hubei University of Technology, Wuhan 430068, China)

  • Ying Liu

    (Key Laboratory of Intelligent Health Perception and Ecological Restoration of Rivers and Lakes, Ministry of Education, Hubei University of Technology, Wuhan 430068, China)

  • Jinghong Feng

    (Key Laboratory of Intelligent Health Perception and Ecological Restoration of Rivers and Lakes, Ministry of Education, Hubei University of Technology, Wuhan 430068, China)

  • Defu Liu

    (Key Laboratory of Intelligent Health Perception and Ecological Restoration of Rivers and Lakes, Ministry of Education, Hubei University of Technology, Wuhan 430068, China)

  • Qilin Yang

    (Institute of Geo-Environment Monitoring of GuiZhou Province, Guiyang 550001, China)

  • Ziyan Lu

    (Key Laboratory of Intelligent Health Perception and Ecological Restoration of Rivers and Lakes, Ministry of Education, Hubei University of Technology, Wuhan 430068, China)

  • Huazhen Xiao

    (Key Laboratory of Intelligent Health Perception and Ecological Restoration of Rivers and Lakes, Ministry of Education, Hubei University of Technology, Wuhan 430068, China)

Abstract

Point bars are crucial elements of river systems, significantly enhancing the nitrogen cycle in riparian zones by facilitating hyporheic exchange between surface water and riparian zones. This study investigated the impact of dissolved oxygen (DO) concentration and temperature on nitrogen transport and reactions in river point bars. A two-dimensional coupled surface water–groundwater model was developed to analyze nitrogen distribution, variations, and reaction rates in rivers with point bars. The model considered three chemical reactions controlling nitrogen transformation: aerobic respiration, nitrification, and denitrification, with DO and temperature as independent variables. The results indicated that DO variations have a limited effect on solute migration depth, whereas increased temperature reduces solute migration depth. At surface water DO concentrations of 0.1, 0.2, and 0.4 mol/m 3 , nitrate removal in the riparian zone was 0.022, 0.0064, and 0.0019 mol/m, respectively. At riparian temperatures of 5 °C, 15 °C, and 25 °C, nitrate removal was 0.012, 0.041, and 0.16 mol/m, respectively. Nitrogen removal is more sensitive to temperature variations than to changes in DO concentration. In this research, the decrease in DO concentrations and the temperature increase greatly enhanced the riparian zone’s denitrification effect. This study improves our understanding of how riparian zones impact nitrogen cycling under various environmental conditions.

Suggested Citation

  • Xunchuan Song & Ying Liu & Jinghong Feng & Defu Liu & Qilin Yang & Ziyan Lu & Huazhen Xiao, 2024. "Influence of Dissolved Oxygen and Temperature on Nitrogen Transport and Reaction in Point Bars of River," Sustainability, MDPI, vol. 16(18), pages 1-18, September.
    • Handle: RePEc:gam:jsusta:v:16:y:2024:i:18:p:8208-:d:1482249
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    References listed on IDEAS

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    1. Qian Zhang & Xue Chen & Wandong Luo & Heng Wu & Xiangyang Liu & Wang Chen & Jianhong Tang & Lijie Zhang, 2019. "Effects of Temperature on the Characteristics of Nitrogen Removal and Microbial Community in Post Solid-Phase Denitrification Biofilter Process," IJERPH, MDPI, vol. 16(22), pages 1-15, November.
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