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长湖地下水排泄及其携带营养盐通量的季节性变化

吴婧 甘义群 杜尧 孙晓梁 韩鹏

吴婧, 甘义群, 杜尧, 孙晓梁, 韩鹏. 长湖地下水排泄及其携带营养盐通量的季节性变化[J]. 地质科技通报, 2024, 43(5): 206-215. doi: 10.19509/j.cnki.dzkq.tb20230205
引用本文: 吴婧, 甘义群, 杜尧, 孙晓梁, 韩鹏. 长湖地下水排泄及其携带营养盐通量的季节性变化[J]. 地质科技通报, 2024, 43(5): 206-215. doi: 10.19509/j.cnki.dzkq.tb20230205
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

长湖地下水排泄及其携带营养盐通量的季节性变化

doi: 10.19509/j.cnki.dzkq.tb20230205
基金项目: 

国家自然科学基金项目 U21A2026

详细信息
    作者简介:

    吴婧, E-mail: 2318672050@qq.com

    通讯作者:

    甘义群, E-mail: yiqungan@cug.edu.cn

  • 中图分类号: P641.2;X143

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

More Information
  • 摘要:

    为揭示地下水对湖泊水量和营养盐平衡的贡献及季节性变化, 以长江中游的长湖为研究对象, 通过丰、枯水期野外采样, 结合电导率(EC)、稳定同位素(2H和18O)、水化学元素(Ca2+、Mg2+)和氡(222Rn)同位素对湖底地下水排泄(lacustrine groundwater discharge, 简称LGD)进行了多手段示踪, 并基于222Rn质量平衡模型量化了不同季节的LGD及其携带的营养盐通量。结果显示: 丰、枯水期LGD速率分别为64.52 mm/d和14.95 mm/d, 丰水期显著大于枯水期; 丰、枯水期地下水携带的总氮(TN)输入通量分别为25.68×106 g/d和5.58×106 g/d, 总磷(TP)输入通量分别8.14×106 g/d和0.17×106 g/d。丰、枯水期LGD强度的差异导致了地下水携带TN、TP输入的差异, 丰水期TP的输入量还受该时期农业活动的影响; 丰水期较强的降水和蒸发驱动了更大的LGD强度及其携带的TN、TP通量。本研究可为长湖区域水资源管理和水生态保护提供重要理论依据。

     

  • 图 1  研究区概况图

    a.长湖的地理位置及其主要水系高程图,以及采样点分布,其中箭头指示地表水流方向;b.基于图a中A-B线展开的长湖水文地质剖面图

    Figure 1.  Map of the study area

    图 2  丰、枯水期湖水和地下水中EC(a)、ρ(Ca2+)(b)、ρ(Mg2+)(c)、222Rn活度(d)的对比图

    Figure 2.  Comparison of the contentration of EC(a), Ca2+ (b), Mg2+(c), and 222Rn(d) in surface water and groundwater during wet and dry seasons

    图 3  丰、枯水期湖水中保守指标与222Rn活度的相关性分析

    n为样本量;r为相关系数;p为皮尔森相关系数

    Figure 3.  Correlation analysis between 222Rn activity and conservative tracers in lake water during the wet and dry seasons

    图 4  丰、枯水期各采样位置湖水和地下水(包括井水和孔隙水)的δ18O(a)和δD(b)特征

    Figure 4.  The δ18O(a) and δD(b) characteristics of lake water and groundwater

    图 5  丰、枯水期不同水体的ρ(TN)(a)、ρ(TP)(b)对比

    Figure 5.  Comparison of TN(a) and TP(b) concentrations in different end-member water bodies during the wet and dry seasons

    图 6  研究区2021年1月至2022年11月的降水、蒸发和湖泊水位的月均数据(气象数据源于欧洲中期天气预报中心,水位数据来源于湖北省水利厅; 湖泊水位基准高程为30 m)

    Figure 6.  Monthly average precipitation, evaporation, and lake water level data in the study area from January 2021 to November 2022

    表  1  222Rn质量平衡模型计算的相关参数

    Table  1.   Parameters of the radon mass balance model

    参数 备注
    丰水期 枯水期
    湖水中222Rn的活度Cw/(Bq·m-3) 1 040.65± 334.26 147.16± 66.17 野外测试
    大气中222Rn的活度Catm/(Bq·m-3) 48.70 16.20 野外测试
    地下水中222Rn的活度Cgw/(Bq·m-3) 22 679.92±4 588.15 10 313.653±2 574.29 野外测试
    沉积物培养孔隙水中222Rn的活度Ceq/(Bq·m-3) 38 233.62 17 494.31 式(5)
    上清液中222Rn的活度A0/(Bq·m-3) 3 030 1 497.02 沉积物培养
    大气温度Tatm/℃ 29.64 8.73 野外测试
    湖水温度T/℃ 32.05 11.70 野外测试
    风速μ10/(m·s-1) 3.43±1.95 4.22±1.99 气象站数据
    湖底沉积物孔隙度n 0.48 0.51 实验室测量
    湖泊深度d/m 3.24 2.94 湖北省湖泊志
    沉积物扩散的222Rn通量Fsed/(Bq·m-2·d-1) 26.66±8.45 8.55±3.26 式(8)
    大气弥散的 222Rn通量Fatm/(Bq·m-2·d-1) 879.82±428.55 84.40±45.28 式(9)
    222Rn衰变量Fdec/(Bq·m-2·d-1) 610.28±196.02 78.31±35.75 式(13)
    地下水排泄的222Rn通量Fgw/(Bq·m-2·d-1) 1 463.43±520.77 154.16±57.60 式(3)
    下载: 导出CSV

    表  2  地下水载荷的营养盐通量

    Table  2.   Nutrients fluxes loaded by groundwater discharge

    ρB/(mg·L-1) 通量FB/(g·d-1)
    ρ(TN) ρ(TP) LGD LGD-TN LGD-TP
    丰水期 3.12 0.99 8.23×106 25.68×106 8.14×106
    枯水期 2.92 0.09 1.91×106 5.58×106 0.17×106
    下载: 导出CSV
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  • 收稿日期:  2023-04-17
  • 录用日期:  2023-06-06
  • 修回日期:  2023-06-05

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