草原曲流河垂向潜流交换及其氮素迁移转化

陈皓月; 胡海珠; 任嘉伟; 田炳燚

doi:10.3799/dqkx.2021.239

Volume 48 Issue 10

Oct. 2023

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Chen Haoyue, Hu Haizhu, Ren Jiawei, Tian Bingyi, 2023. Vertical Hyporheic Exchange and Nitrogen Transport and Transformation in Prairie Meandering Rivers. Earth Science, 48(10): 3866-3877. doi: 10.3799/dqkx.2021.239

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Chen Haoyue, Hu Haizhu, Ren Jiawei, Tian Bingyi, 2023. Vertical Hyporheic Exchange and Nitrogen Transport and Transformation in Prairie Meandering Rivers. Earth Science, 48(10): 3866-3877. doi: 10.3799/dqkx.2021.239

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Vertical Hyporheic Exchange and Nitrogen Transport and Transformation in Prairie Meandering Rivers

doi: 10.3799/dqkx.2021.239

Chen Haoyue^{1, 2
,
,},
Hu Haizhu^{1, 2
,
,
,},
Ren Jiawei^{1, 2},
Tian Bingyi^{1, 2}

1.
School of Ecology and Environment, Inner Mongolia Key Laboratory of River and Lake Ecology, Inner Mongolia University, Hohhot 010031, China
2.
Key Laboratory of Ecology and Resource Use of the Mongolian Plateau, Ministry of Education, Hohhot 010031, China

Received Date: 2021-08-30
Available Online: 2023-10-31
Publish Date: 2023-10-25

Abstract

Abstract

The hyporheic zone is a critical interface between surface water and groundwater where water and materials exchange actively. The study of nitrogen transport and transformation in the hyporheic zone of rivers is of great significance for improving river water quality and maintaining the stability of water ecosystems. To investigate the nitrogen transport and transformation processes in the hyporheic zone of prairie meandering rivers in the semi-arid region, a meandering reach of the Xilin River was taken as the research object, and the vertical hyporheic exchange patterns and nitrogen transformation characteristics in the hyporheic zone were analyzed by combining the hydrodynamic and hydrochemical methods. The results show that the vertical hyporheic exchange is dominated by a weak upwelling flow with an average hydraulic gradient of -0.023 during the non-rainfall period. Rainfall and upland water can lead to a reversal of the exchange direction and an appearance of downwelling flow with an average hydraulic gradient of 0.086. The vertical hyporheic exchange rate decreases with depth, with the average exchange rate at 20, 50 and 100 cm below the surface of river bed is 0.102, 0.041 and 0.017 m·d^-1, respectively, the depth of 100 cm is the lower boundary of vertical exchange. Ammonification, nitrification, denitrification and dissimilatory reduction reactions are likely to occur in the hyporheic zone, with the depth of 50 cm being the hot spot where the reversal of biogeochemical gradients occurs. The vertical hyporheiczone of prairie meandering rivers is a sink for nitrate. The removal effect on nitrate indicates spatial differences with stronger removal rate in deep sediments than in shallow ones. The average removal rate of nitrate were 34% and 28% under upwelling and downwelling conditions, respectively.Compared with the inflow and outflow points, the vertical exchange at the apex of the meandering reach is relatively weak, and the nitrogen concentration is low. The apex may be the hot spot of biogeochemical reactions in the hyporheic zones driven by meanders.
- meandering river,
- hyporheic exchange,
- nitrogen transformation,
- nitrogen sink,
- riverbed,
- groundwater,
- hydrogeology

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References(56)

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Vertical Hyporheic Exchange and Nitrogen Transport and Transformation in Prairie Meandering Rivers

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