Volume 43 Issue 5
Sep.  2024
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WU Jing, GAN Yiqun, DU Yao, SUN Xiaoliang, HAN Peng. Seasonal variations in groundwater discharge and associated nutrient fluxes in Changhu Lake[J]. Bulletin of Geological Science and Technology, 2024, 43(5): 206-215. doi: 10.19509/j.cnki.dzkq.tb20230205
Citation: WU Jing, GAN Yiqun, DU Yao, SUN Xiaoliang, HAN Peng. Seasonal variations in groundwater discharge and associated nutrient fluxes in Changhu Lake[J]. Bulletin of Geological Science and Technology, 2024, 43(5): 206-215. doi: 10.19509/j.cnki.dzkq.tb20230205

Seasonal variations in groundwater discharge and associated nutrient fluxes in Changhu Lake

doi: 10.19509/j.cnki.dzkq.tb20230205
More Information
  • Author Bio:

    WU Jing, E-mail: 2318672050@qq.com

  • Corresponding author: GAN Yiqun, E-mail: yiqungan@cug.edu.cn
  • Received Date: 17 Apr 2023
  • Accepted Date: 06 Jun 2023
  • Rev Recd Date: 05 Jun 2023
  • Objective

    To assess contribution and seasonal variation in groundwater discharge (LGD) to lake water and nutrient budgets,

    Methods

    this study investigated Changhu Lake in the middle reaches of the Yangtze River. Field sampling was conducted during both the wet and dry seasons using multiple tracing techniques, including electrical conductivity (EC), stable isotope (2H and 18O), hydrochemical element (Ca2+ and Mg2+), and 222Rn isotope data. The 222Rn mass balance model was employed to quantify the LGD and associated nutrient fluxes in different seasons.

    Results

    Results show that LGD rates during the wet and dry seasons were 64.52 mm/d and 14.95 mm/d, respectively, with significant differences between these seasons. Furthermore, during the wet and dry seasons, groundwater carried TN inputs of approximately 25.68×106 g/d and 5.58×106 g/d, respectively. The TP inputs were approximately 8.14×106 g/d and 0.17×106 g/d in the wet and dry seasons, respectively. The differences in the LGD rates between the wet and dry seasons lead to differences in groundwater carrying TN and TP inputs, and inputs of TP during the wet season is also influenced by agricultural activities during that period. Sronger precipitation and evaporation during the wet season drive greater LGD intensity and their carrying TN and TP fluxes.

    Conclusion

    The research can provide scientific reference for water resource management and aquatic ecosystem preservation efforts in the Changhu area.

     

  • The authors declare that no competing interests exist.
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