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氢氧同位素在地下水流系统的重分布:从高程效应到深度效应

韩鹏飞 王旭升 蒋小伟 万力

韩鹏飞,王旭升,蒋小伟,等. 氢氧同位素在地下水流系统的重分布:从高程效应到深度效应[J]. 水文地质工程地质,2023,50(0): 1-12 doi:  10.16030/j.cnki.issn.1000-3665.202211053
引用本文: 韩鹏飞,王旭升,蒋小伟,等. 氢氧同位素在地下水流系统的重分布:从高程效应到深度效应[J]. 水文地质工程地质,2023,50(0): 1-12 doi:  10.16030/j.cnki.issn.1000-3665.202211053
HAN Pengfei, WANG Xusheng, JIANG Xiaowei, et al. Redistribution of hydrogen and oxygen isotopes in groundwater flow systems: from altitude effect to depth effect[J]. Hydrogeology & Engineering Geology, 2023, 50(0): 1-12 doi:  10.16030/j.cnki.issn.1000-3665.202211053
Citation: HAN Pengfei, WANG Xusheng, JIANG Xiaowei, et al. Redistribution of hydrogen and oxygen isotopes in groundwater flow systems: from altitude effect to depth effect[J]. Hydrogeology & Engineering Geology, 2023, 50(0): 1-12 doi:  10.16030/j.cnki.issn.1000-3665.202211053

氢氧同位素在地下水流系统的重分布:从高程效应到深度效应

doi: 10.16030/j.cnki.issn.1000-3665.202211053
基金项目: 国家自然科学基金项目(41772249;42172270)
详细信息
    作者简介:

    韩鹏飞(1988-),男,博士,讲师,主要从事地下水循环的研究工作。E-mail:pfhan@cugb.edu.cn

    通讯作者:

    王旭升(1974-),男,博士,教授,主要从事地下水循环的研究工作。E-mail:wxsh@cugb.edu.cn

  • 中图分类号: P641.2

Redistribution of hydrogen and oxygen isotopes in groundwater flow systems: from altitude effect to depth effect

  • 摘要: 大气降水的氢氧同位素含量具有高程效应,降水入渗后参与地下水循环,其高程效应如何受地下水流系统的影响转化为地下水氢氧同位素的深度效应?现有研究对于这个问题缺少定量认识。本文构建单向倾斜盆地和双峰波状盆地的稳态地下水循环理论模型,采用MODFLOW模拟剖面二维地下水流场、采用MT3DMS模拟重同位素分子的对流-弥散过程,得到地下水D和18O含量的空间分布,探讨了氢氧同位素高程效应在地下水流系统转化为深度效应的机理。结果表明:在单斜盆地,补给区大气降水D和18O含量的高程效应转化为排泄区地下水δD和δ18O值随埋深增大而指数型衰减的深度效应;在双峰波状盆地,当含水层渗透性相对入渗强度较大时(K0/w=1000),仅发育一个区域地下水流系统,在区域地下水的排泄区δD和δ18O随埋深增大呈现S形曲线分布;当含水层渗透性相对入渗强度较小时(K0/w=250),双峰波状盆地发育多个局部地下水流系统,区域地下水的排泄区δD和δ18O随埋深增大呈现S形曲线,而局部地下水排泄区的δD和δ18O随深度增加呈单调衰减趋势。本研究从理论上推进了地下水流系统对溶质运移影响机理的认识,揭示了氢氧同位素对地下水流系统的指示作用。
  • 图  1  大气降水同位素高程效应与地下水同位素深度效应示意图

    Figure  1.  Schematic diagram of the isotopic altitude effect in precipitation and isotopic depth effect in groundwater

    图  2  算例情景Case-I模拟结果:(a)地下水流网图;(b)地下水18O分布图;(c)泉点处18O随深度的变化

    Figure  2.  Simulation results in the Case-I scenario: (a) groundwater flow network; (b) distribution of δ18O value in groundwater; (c) the variation of δ18O value with depth at the spring point.

    图  3  算例情景Case-II模拟结果:(a)地下水流网;(b)地下水δD分布图;(c)泉点处δD随深度变化

    Figure  3.  Simulation results in the Case-II scenario: (a) groundwater flow network; (b) distribution of δD value in groundwater; (c) the variation of δD with depth at the spring point.

    图  4  算例情景Case-III模拟结果:(a)地下水流系统;(b)地下水δD分布图;(c)典型位置δD随深度变化

    Figure  4.  Simulation results in the Case-III scenario: (a) groundwater flow systems; (b) distribution of δD value in groundwater; (c) the variation of δD value with depth at the typical position.

    图  5  泉点处地下水氢氧同位素模拟结果随纵向弥散度的变化:(a)情景Case-I;(b)情景Case-II

    Figure  5.  Variation of simulated hydrogen and oxygen isotopes in groundwater with vertical dispersion at the spring point: (a) Scenario of Case-I; (b) Scenario of Case-II.

    表  1  不同模拟情景的控制参数

    Table  1.   Control parameters in different simulation scenarios

    参数模拟情景
    Case-ICase-IICase-III
    地貌
    形态
    z0/m100500500
    Δzm/m1200800800
    Δzf /m0400400
    其它L=12 km,zD= −400 m
    渗透性K0 / (m·d−11.001.000.25
    其它Kh/Kv=10,βk =0.002 m−1
    补给与排泄w=0.001 m/d,Cd =0.1 d−1
    孔隙度φ0=0.2,βp =0.001 m−1
    弥散参数αL=20 m,αT=2 m,D0=0.0063 m2·d−1
    同位素Dδ*D= −50.0, ηD=0.0300 m−1
    同位素18Oδ*18O= −7.5, ηO=0.0038 m−1
    下载: 导出CSV
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  • 收稿日期:  2022-11-07
  • 修回日期:  2022-12-20

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