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江汉平原过渡带黏性层状土弥散试验与模拟研究

刘泳佚 史婷婷 王清 刘添文 刘亚磊 李梦茹

刘泳佚,史婷婷,王清,等. 江汉平原过渡带黏性层状土弥散试验与模拟研究[J]. 水文地质工程地质,2023,50(1): 41-50 doi:  10.16030/j.cnki.issn.1000-3665.202201036
引用本文: 刘泳佚,史婷婷,王清,等. 江汉平原过渡带黏性层状土弥散试验与模拟研究[J]. 水文地质工程地质,2023,50(1): 41-50 doi:  10.16030/j.cnki.issn.1000-3665.202201036
LIU Yongyi, SHI Tingting, WANG Qing, et al. A study of dispersion experiment and simulation of the cohesive layered soil in the transition zone of the Jianghan Plain[J]. Hydrogeology & Engineering Geology, 2023, 50(1): 41-50 doi:  10.16030/j.cnki.issn.1000-3665.202201036
Citation: LIU Yongyi, SHI Tingting, WANG Qing, et al. A study of dispersion experiment and simulation of the cohesive layered soil in the transition zone of the Jianghan Plain[J]. Hydrogeology & Engineering Geology, 2023, 50(1): 41-50 doi:  10.16030/j.cnki.issn.1000-3665.202201036

江汉平原过渡带黏性层状土弥散试验与模拟研究

doi: 10.16030/j.cnki.issn.1000-3665.202201036
基金项目: 中国地质调查局地质调查项目(DD20160290;DD20190315); 国家自然科学基金项目(42002262)
详细信息
    作者简介:

    刘泳佚(1996-),男,硕士研究生,主要从事水文地质方面的研究。E-mail:841698713@qq.com

    通讯作者:

    王清(1986-),男,硕士,高级工程师,主要从事水文地质、生态地质方面的研究。E-mail:wangqing@mail.cgs.gov.cn

  • 中图分类号: S153

A study of dispersion experiment and simulation of the cohesive layered soil in the transition zone of the Jianghan Plain

  • 摘要: 为研究江汉平原—大别山区过渡带黏性层状土中溶质迁移的规律,以保守性阴离子Br为示踪剂,通过等温吸附试验、一维弥散试验、HYDRUS-1D软件模拟反演手段,研究了Br在黏性层状土中的吸附参数、迁移规律,模拟反演其弥散参数。结果表明:(1)Freundlich模型和Langmuir模型均能较好的拟合吸附试验结果,随着土壤中黏粒比例的增大,土壤对Br的饱和吸附量有所增加;(2)层状土中土壤质地与结构均会影响穿透曲线的形状,但一维饱和土柱中的弥散过程主要取决于含水介质系统中黏性颗粒的占比,黏粒的增加会对溶质运移产生阻碍作用;(3)通过HYDRUS-1D软件构建模型反演弥散参数,R2均大于0.991,拟合效果较好,分析发现层状土中无论土壤组成类型还是层厚及排序的影响,其本质都是改变了土壤的平均孔隙流速从而影响弥散作用,平均孔隙流速越小其弥散系数越小;(4)试验中粉质黏土弥散系数约为0.005~0.048 cm2/d,远远小于下部砂土弥散系数0.524~7.477 cm2/d,差值达到了至少两个数量级,表明研究区内厚层黏土为控制地层,会较大程度阻碍地下水中溶质运移,上部含水层中的污染物或有机质很难穿透该层向下迁移,具有良好的截污性能。研究结果对江汉平原过渡带地下水环境保护、水质治理具有重要应用价值。
  • 图  1  研究区地质平面图

    Figure  1.  Geologic ichnography of the study area

    图  2  土柱构型示意图

    Figure  2.  Schematic diagram of soil column configuration

    图  3  试验装置示意图

    Figure  3.  Schematic diagram of experimental device

    图  4  试验各土柱溶质穿透曲线图

    Figure  4.  Solute penetration curve of each soil column in the experiment

    图  5  各土柱穿透曲线拟合效果图

    Figure  5.  Fitting effect diagram of penetration curve of each soil column

    表  1  研究区土壤颗粒分级数据

    Table  1.   Soil particle classification data in the study area

    编号深度/m砂粒/%粉粒/%黏粒/%土壤质地类型
    1号2.01.1775.0723.76粉质亚黏土
    2号5.01.2062.1536.65粉质黏土
    3号6.53.0079.4217.58粉质亚黏土
    4号13.545.1041.5413.36砂质亚黏土
    5号14.266.1726.437.40砂质亚砂土
    下载: 导出CSV

    表  2  试验各土柱具体构型

    Table  2.   Specific configurations of soil columns in the experiment

    编号总长度/ cm土柱构型及厚度(由上至下)
    1号10粉质亚黏土(10 cm)
    2号粉质黏土(10 cm)
    3号粉质亚黏土(10 cm)
    4号砂质亚黏土(10 cm)
    5号砂质亚砂土(10 cm)
    6号粉质亚黏土(7.6 cm)+粉质黏土(2.4 cm)
    7号粉质黏土(1.6 cm)+粉质亚黏土(8.4 cm)
    8号砂质亚黏土(5 cm)+砂质亚砂土(5 cm)
    9号粉质亚黏土(3.5 cm)+粉质黏土(1 cm)+
    粉质亚黏土(5.5 cm)
    下载: 导出CSV

    表  3  Freundlich方程和Langmuir方程拟合参数结果

    Table  3.   Fitting parameter results of Freundlich equation and Langmuir equation

    样品Langmuir模型拟合Freundlich模型拟合
    qm /(mg·g−1KLR2Kf /(L·mg−1n/(L·mg−1R2
    1号 粉质亚黏土5.988±0.4330.0650.9700.8362.4880.921
    2号 粉质黏土10.169±1.9950.0230.9570.5571.8090.927
    3号 粉质亚黏土3.831±0.3730.0520.9600.4512.3240.924
    4号 砂质亚黏土3.522±0.2300.0390.9870.3242.1130.986
    5号 砂质亚砂土2.651±0.2540.0870.9260.4292.6240.922
    下载: 导出CSV

    表  4  均质土柱HYDRUS模型反演弥散参数

    Table  4.   Dispersion parameters inversed by Hydrus model of homogeneous soil column

    土柱编号V /(cm·d−1Br质量浓度/(g·L−1α/cmD/(cm2·d−1R2
    1号 粉质亚黏土0.153.8830.3270.0480.992
    2号 粉质黏土0.043.8830.1180.0050.991
    3号 粉质亚黏土0.243.8830.4810.1180.997
    4号 砂质亚黏土0.443.8831.2000.5240.997
    5号 砂质亚砂土2.923.8832.5617.4770.993
    下载: 导出CSV

    表  5  层状土柱HYDRUS模型反演弥散参数

    Table  5.   Dispersion parameters inversed by Hydrus model of layered soil column

    土柱编号V
    /(cm·d−1
    Br质量浓度
    /(g·L−1
    α
    /cm
    D
    /(cm2·d−1
    R2
    6号粉质亚黏土(上)0.083.8830.3820.0310.997
    粉质黏土(下)0.1290.010
    7号粉质黏土(上)0.233.8830.1250.0290.997
    粉质亚黏土(下)0.5130.118
    8号砂质亚黏土(上)1.233.8831.3851.7040.998
    砂质亚砂土(下)2.4553.020
    9号粉质亚黏土(上)0.243.8830.3130.0750.994
    粉质黏土(中)0.1330.032
    粉质亚黏土(下)0.4900.118
    下载: 导出CSV
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出版历程
  • 收稿日期:  2022-01-19
  • 修回日期:  2022-03-02
  • 网络出版日期:  2022-12-13
  • 刊出日期:  2023-01-13

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