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    新疆喀什三角洲地下水流系统的水化学和同位素标记

    魏兴 周金龙 梁杏 乃尉华 曾妍妍 范薇 李斌

    魏兴, 周金龙, 梁杏, 乃尉华, 曾妍妍, 范薇, 李斌, 2020. 新疆喀什三角洲地下水流系统的水化学和同位素标记. 地球科学, 45(5): 1807-1817. doi: 10.3799/dqkx.2019.177
    引用本文: 魏兴, 周金龙, 梁杏, 乃尉华, 曾妍妍, 范薇, 李斌, 2020. 新疆喀什三角洲地下水流系统的水化学和同位素标记. 地球科学, 45(5): 1807-1817. doi: 10.3799/dqkx.2019.177
    Wei Xing, Zhou Jinlong, Liang Xing, Nai Weihua, Zeng Yanyan, Fan Wei, Li Bin, 2020. Hydrochemical and Isotopic Markers of Groundwater Flow Systems in the Kashgar Delta Area in Xinjiang. Earth Science, 45(5): 1807-1817. doi: 10.3799/dqkx.2019.177
    Citation: Wei Xing, Zhou Jinlong, Liang Xing, Nai Weihua, Zeng Yanyan, Fan Wei, Li Bin, 2020. Hydrochemical and Isotopic Markers of Groundwater Flow Systems in the Kashgar Delta Area in Xinjiang. Earth Science, 45(5): 1807-1817. doi: 10.3799/dqkx.2019.177

    新疆喀什三角洲地下水流系统的水化学和同位素标记

    doi: 10.3799/dqkx.2019.177
    基金项目: 

    新疆自治区自然科学基金项目 2019D01B18

    国家自然科学基金项目 41662016

    详细信息
      作者简介:

      魏兴(1993-), 男, 博士研究生, 主要从事同位素水文地质学与地下水或地表水转化研究

      通讯作者:

      周金龙

    • 中图分类号: P641

    Hydrochemical and Isotopic Markers of Groundwater Flow Systems in the Kashgar Delta Area in Xinjiang

    • 摘要: 新疆喀什三角洲地下水“水质型”缺水问题较为突出,开展地下水流系统研究具有实际意义.采用水化学和环境同位素年龄测试法,在对喀什三角洲地下水含水系统划分基础上,对地下水化学和循环更新特征进行了分析研究.结果表明:三角洲含水系统由山前倾斜冲洪积平原潜水、河流冲积平原潜水和河流冲积平原承压水构成.沿地下水流向,水化学类型演化为HCO3·SO4-Ca→SO4-Ca→SO4·Cl-Mg·Na→SO4·Cl-Na,TDS增高,水质趋向盐化.山前倾斜冲洪积平原为溶滤-径流区,河流冲积平原为径流-累盐区.研究区地下水更新速率为0.03%~16.35%·a-1,具有山前倾斜冲洪积平原潜水>河流冲积平原潜水>河流冲积平原承压水的特征.利用3H估算得出,山前倾斜冲洪积平原潜水年龄为8~49 a,平均值为29 a;河流冲积平原潜水年龄为14~>50 a,其中上部潜水平均年龄为24 a,下部潜水平均年龄大于50 a.利用14C估算得出,河流冲积平原潜水为476~33 623 a,平均值为8 106 a;河流冲积平原承压水为5 186~34 578 a,平均值为30 043 a,与潜水比为“更古老”的水.综合以上特征得出,喀什三角洲地下水含水系统可以划分为2个更新速率较快的局部水流系统(Ⅰ1和Ⅰ2)和一个循环滞缓的区域水流系统(Ⅱ).

       

    • 图  1  研究区地下水采样点分布

      Fig.  1.  Distribution of groundwater sampling locations in the study area

      图  2  含水介质中矿物饱和指数关系

      Fig.  2.  Saturation index relation of minerals in aquifer medium

      图  3  潜水3H年龄及更新速率

      Fig.  3.  3H age and the renewal rates in unconfined groundwater

      图  4  典型剖面地下水流系统

      Fig.  4.  Groundwater flow systems of typical section

      表  1  地下水化学参数与频数分布

      Table  1.   Hydrochemical parameters and frequency distribution in groundwater

      水文地质单元 指标 统计值 按地下水质量标准限值分组(个)
      最大值 最小值 平均值 2Ⅴ 4Ⅴ 8Ⅴ 16Ⅴ 32Ⅴ
      山前倾斜冲洪积平原潜水(n=49) pH 8.42 7.26 7.88 49 0 0 0
      TDS(mg·L-1 3 163.8 291.5 1 136.0 1 9 17 13 9 0 0 0 0 0
      总硬度(mg·L-1 1 306.2 170.9 524.3 0 14 10 10 14 1 0 0 0 0
      Na+(mg·L-1 759.3 14.5 189.3 20 12 4 5 8 0 0 0 0 0
      Ca2+(mg·L-1 265 28.4 112.7
      Mg2+(mg·L-1 176.9 4.4 59.2
      Cl-(mg·L-1 822.6 14.2 229.8 7 21 8 5 1 7 0 0 0 0
      HCO3-(mg·L-1 1 294.9 24.4 185.0
      SO42-(mg·L-1 1 239.3 101.9 440.5 0 6 13 4 14 12 0 0 0 0
      河流冲积平原潜水(n=78) pH 8.28 7.11 7.78 78 0 0 0
      TDS(mg·L-1 44 130.4 280.4 6 404.8 2 6 23 16 13 5 0 7 6 0
      总硬度(mg·L-1 10 619.8 158.4 1 871.8 0 10 13 13 17 10 5 9 1 0
      Na+(mg·L-1 13 916.7 31.2 1 645.9 21 14 5 13 9 3 0 5 7 1
      Ca2+(mg·L-1 1 707.2 34.1 262.0
      Mg2+(mg·L-1 2 272.5 15.3 296.4
      Cl-(mg·L-1 20 210.5 22.7 2 027.0 9 25 8 11 3 9 0 0 8 5
      HCO3-(mg·L-1 756.8 59.8 265.2
      SO42-(mg·L-1 9 611.8 92.2 1 779.8 0 5 9 8 19 14 8 3 11 1
      河流冲积平原承压水(n=275) pH 8.52 7.23 7.86 274 1 0 0
      TDS(mg·L-1 21 966.2 246.5 2 900.8 3 23 76 55 58 38 16 6 0 0
      总硬度(mg·L-1 10 239.1 48.2 1 187.6 13 47 42 29 62 49 28 5 0 0
      Na+(mg·L-1 5 115.4 14.1 571.7 46 38 30 50 59 32 13 7 0 0
      Ca2+(mg·L-1 1 769.7 9.3 197.7
      Mg2+(mg·L-1 1 187.7 3.2 163.9
      Cl-(mg·L-1 6 044.6 19.8 617.7 23 75 32 21 55 41 16 10 2 0
      HCO3-(mg·L-1 1 320.9 48.8 223.7
      SO42-(mg·L-1 9 173.6 39.7 1 231.4 1 17 34 25 69 54 40 29 6 0
      下载: 导出CSV

      表  2  地下水3H年龄估算结果

      Table  2.   Estimation of 3H age in groundwater

      水文地质单元 分布范围(a) 样本数n(个) 占比(%) 平均值(a)
      山前倾斜冲洪积平原潜水(n=28) 0~10 1 3.6 8
      10~30 19 67.9 24
      30~50 8 28.5 44
      > 50
      河流冲积平原潜水(n=37) 0~10
      10~30 18 48.6 22
      30~50 2 5.4 40
      > 50 17 46.0
      河流冲积平原承压水(n=27) 0~10
      10~30
      30~50
      > 50 27 100.0
      下载: 导出CSV

      表  3  地下水更新速率估算结果

      Table  3.   Estimation of groundwater renewal rate

      水文地质单元 分布范围(%·a-1 样本数n(个) 占比(%) 平均值(%·a-1
      山前倾斜冲洪积平原潜水(n=28) 10~16.35 2 7.2 13.80
      5~10 13 46.4 6.20
      0~5 13 46.4 3.83
      河流冲积平原潜水(n=37) 10~16.35
      5~10 17 45.9 6.70
      0~5 20 54.1 1.10
      河流冲积平原承压水(n=27) 10~16.35
      5~10
      0~5 27 100.0 0.02
      下载: 导出CSV

      表  4  地下水14C年龄估算结果

      Table  4.   Estimation of 14C age in groundwater

      水文地质单元 分布范围(a) 样本数n(个) 占比(%) 平均值(a)
      河流冲积平原潜水(n=14) 50~1 000 2 14.3 602
      1 000~10 000 10 71.4 4 506
      10 000~33 623 2 14.3 33 609
      河流冲积平原承压水(n=14) 50~1 000
      1 000~10 000 1 7.1 5 186
      10 000~34 578 13 92.9 31 955
      下载: 导出CSV

      表  5  不同地区地下水14C年龄对比

      Table  5.   Comparison of 14C age in groundwater in different areas

      地区 参考文献 取样深度(m) 14C年龄(a) 最大年龄比值
      宁夏银川平原 苏小四等(2006) 70~250 0~8 750 0.25
      北京市潮白河冲积扇 翟远征等(2013) 100~200 2 000~12 000 0.35
      甘肃黑河流域 阮云峰等(2015) 70~150 0~14 000 0.40
      宁夏固原 黄小琴等(2014) 100~180 2 000~23 800 0.69
      山东鲁北平原 杨丽芝等(2009) 300~350 2 620~25 470 0.74
      青海柴达木盆地 刘峰等(2014) < 180 0~28 000 0.81
      新疆喀什三角洲 本文 < 350 476~34 578 1.00
      河北平原 卫文等(2011) 250~550 673~35 200 1.02
      下载: 导出CSV
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    • 收稿日期:  2019-07-17
    • 刊出日期:  2020-05-15

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