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基于蒸发法和联合测定仪测定土壤水分特征曲线和非饱和渗透系数的试验研究

向峥宇 潘欢迎 邓斌 刘延锋

向峥宇, 潘欢迎, 邓斌, 刘延锋. 基于蒸发法和联合测定仪测定土壤水分特征曲线和非饱和渗透系数的试验研究[J]. 地质科技通报, 2023, 42(4): 210-217. doi: 10.19509/j.cnki.dzkq.2022.0262
引用本文: 向峥宇, 潘欢迎, 邓斌, 刘延锋. 基于蒸发法和联合测定仪测定土壤水分特征曲线和非饱和渗透系数的试验研究[J]. 地质科技通报, 2023, 42(4): 210-217. doi: 10.19509/j.cnki.dzkq.2022.0262
Xiang Zhengyu, Pan Huanying, Deng Bin, Liu Yanfeng. Experimental study of the soil water characteristic curve and unsaturated permeability coefficient based on the evaporation method and combined measuring instrument[J]. Bulletin of Geological Science and Technology, 2023, 42(4): 210-217. doi: 10.19509/j.cnki.dzkq.2022.0262
Citation: Xiang Zhengyu, Pan Huanying, Deng Bin, Liu Yanfeng. Experimental study of the soil water characteristic curve and unsaturated permeability coefficient based on the evaporation method and combined measuring instrument[J]. Bulletin of Geological Science and Technology, 2023, 42(4): 210-217. doi: 10.19509/j.cnki.dzkq.2022.0262

基于蒸发法和联合测定仪测定土壤水分特征曲线和非饱和渗透系数的试验研究

doi: 10.19509/j.cnki.dzkq.2022.0262
基金项目: 

第三次新疆综合科学考察项目 2022xjkk0304

国家重点研发项目 2017YFC0406105

中国地质调查局项目 DD20179605

详细信息
    作者简介:

    向峥宇(1995—), 男, 现正攻读水文地质学硕士学位, 主要从事包气带监测和模拟方面研究工作。E-mail: zhengyuxiang@cug.edu.cn

    通讯作者:

    潘欢迎(1975—), 男, 副教授, 主要从事水文地质和环境地质领域的教学和科研工作。E-mail: phy75@163.com

  • 中图分类号: P641

Experimental study of the soil water characteristic curve and unsaturated permeability coefficient based on the evaporation method and combined measuring instrument

  • 摘要:

    为确定以蒸发法为基础设计的土壤水分特征曲线和非饱和渗透系数联合测定仪的可靠性和适用范围, 选取粉黏壤土、壤土和壤砂土3种土样进行试验研究。在自然蒸发作用下, 利用联合测定仪获得蒸发通量、含水量和土柱表面下方5, 10 cm处的基质吸力, 以线性假设理论为基础处理实测数据, 利用HYDRUS-1D软件进行模拟和反演, 输入实测基质吸力和通量数据确定土壤水力参数, 利用RETC软件对已处理数据进行VG-Mualem模型拟合。结果表明, 含水率符合线性假设理论, 基质吸力线性变化不是很理想, 但除砂土之外的土样可以通过降低蒸发速率和缩短2次测量时间间隔来解决这个问题; 试验数据的拟合效果好, 与模拟结果的误差较小, 试验前期所测非饱和渗透系数与模拟值误差较大, 主要跟含水率接近饱和时水力梯度的精度不能得到保证有关, 可以忽略这些数据来改进。使用蒸发法和联合测定仪测定土壤水分特征曲线和非饱和渗透系数具有比较好的可靠性。

     

  • 图 1  土壤水分特征曲线和非饱和渗透系数联合测定仪示意图

    1.土样放置容器; 2.纱网; 3.电子计数秤; 4.张力计; 5.PVC透明水管; 6.传感器; 7.负压实时显示器

    Figure 1.  Schematic diagram of the soil water characteristic curve and unsaturated permeability coefficient combined measuring instrument

    图 2  空间线性分布分析图(RMSE.均方根误差; RE.相对误差,下同)

    Figure 2.  Analysis diagram of spatial linear distribution

    图 3  时间线性变化分析图

    Figure 3.  Analysis diagram of time linear variation

    图 4  试验值与模拟值对比分析图

    Figure 4.  Comparative analysis diagram of test and inversion values

    图 5  SWCC拟合情况(a1~a3)和非饱和渗透系数拟合情况(b1~b3)

    Figure 5.  Fitting situation of SWCC (a1-a3) and unsaturated permeability coefficient (b1-b3)

    表  1  试验土的基本参数

    Table  1.   Basic parameters of the test soil

    编号 饱和含水率 干密度/(g·cm-3) 颗粒组成/% 美国制定名
    砂粒 粉粒 黏粒
    1 0.491 0 1.315 0 65.60 34.40 粉黏壤土
    2 0.482 3 1.444 49.86 36.00 14.14 壤土
    3 0.512 4 1.381 83.54 7.97 8.49 壤砂土
    下载: 导出CSV

    表  2  土壤水力参数反演结果

    Table  2.   Inversion results of soil hydraulic parameters

    编号 θr α/cm-1 n Ks/(cm·d-1)
    1 0.065 0.009 1.488 12.640
    2 0.090 0.005 1.663 6.776
    3 0.158 0.012 1.288 4.593
    注:Qr为残余土壤体积含水率;α为进气值的倒数;n为土壤孔隙尺寸分布参数;Ks为饱和导水率
    下载: 导出CSV

    表  3  土壤水力参数拟合结果

    Table  3.   Fitting results of soil hydraulic parameters

    编号 θr α/cm-1 n Ks/(cm·d-1)
    1 0.167 0.024 1.397 281.184
    2 0.280 0.007 2.312 10.507
    3 0.248 0.005 1.983 1.046
    下载: 导出CSV
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  • 收稿日期:  2022-04-26
  • 录用日期:  2023-02-10
  • 修回日期:  2022-06-02

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