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包气带井回灌引起的非饱和-饱和流分析

祁翠婷 詹红兵 郝永红

祁翠婷, 詹红兵, 郝永红. 包气带井回灌引起的非饱和-饱和流分析[J]. 地质科技通报, 2023, 42(4): 118-129. doi: 10.19509/j.cnki.dzkq.tb20220703
引用本文: 祁翠婷, 詹红兵, 郝永红. 包气带井回灌引起的非饱和-饱和流分析[J]. 地质科技通报, 2023, 42(4): 118-129. doi: 10.19509/j.cnki.dzkq.tb20220703
Qi Cuiting, Zhan Hongbin, Hao Yonghong. Analysis of unsaturated-saturated flow induced by a vadose zone well injection[J]. Bulletin of Geological Science and Technology, 2023, 42(4): 118-129. doi: 10.19509/j.cnki.dzkq.tb20220703
Citation: Qi Cuiting, Zhan Hongbin, Hao Yonghong. Analysis of unsaturated-saturated flow induced by a vadose zone well injection[J]. Bulletin of Geological Science and Technology, 2023, 42(4): 118-129. doi: 10.19509/j.cnki.dzkq.tb20220703

包气带井回灌引起的非饱和-饱和流分析

doi: 10.19509/j.cnki.dzkq.tb20220703
基金项目: 

国家自然科学基金地质联合基金项目 U2244214

详细信息
    作者简介:

    祁翠婷(1992—), 女, 讲师, 主要从事含水层人工补给及含水层热能储存模拟研究。E-mail: qicuiting@126.com

  • 中图分类号: P641

Analysis of unsaturated-saturated flow induced by a vadose zone well injection

  • 摘要:

    包气带井回灌是人工补给含水层的重要方法。在回灌过程中,非饱和带水力参数的准确描述对于提高评价精度、增强回灌管理具有重要意义。目前已有的许多包气带井回灌的解析模型是基于Gardner土壤水分特征曲线模型(含二参数)建立的,随着三参数模型(MB模型)和四参数模型(MN模型)的提出,一个值得关注的问题是使用更加灵活的土壤水分特征曲线模型是否能提高回灌系统中非饱和-饱和流的模拟精度。本研究采用MN模型(Gardner模型和MB模型为其子集)建立了包气带井回灌模型,使用COMSOL Multiphysics对模型进行求解,所得解用于研究在回灌过程中非饱和带水力参数和地表通量对非饱和-饱和流的影响,并比较在回灌过程中基于不同土壤水分特征曲线模型所得到的水力响应。试验结果分析发现包气带井回灌引起的水力响应以及地表通量对回灌的影响均会受到非饱和带渗透性以及储水能力的影响,相对渗透系数指数ωk影响非饱和带渗透系数的变化,持水指数ωc影响非饱和带的储水能力,将指数参数简化为ωk=ωc=ω会在计算和预测包气带井回灌引起的水力响应时带来一定的误差。压力头阈值差b1=ψa-ψk的绝对值较小时,对水头增量的影响也较小,此时将其简化为b1=ψa-ψk=0所带来的误差也较小。本研究成果可以帮助学者们提高对包气带井回灌过程的认识,对于回灌方案设计、实施和管理具有重要的实际意义。

     

  • 图 1  包气带井回灌以及地表通量所引起的非饱和-饱和流示意图

    a为非饱和带厚度;b为饱和带厚度;d为回灌井段底部到初始地下水的垂直距离;I(t)为地表通量;Q为流量;r为沿水平径向水流方向的坐轴标;j为回灌井段顶部到初始地下水位的垂直距离

    Figure 1.  Schematic diagrams of unsaturated-saturated flow induced by vadose zone well injection and ground surface flux

    图 2  包气带井回灌的二维轴对称数值模型示意

    bD为无量纲饱和带厚度;dD为底部到初始地下水位的垂直距离;jD为回灌井段顶部到初始地下水位的无量纲垂直距离

    Figure 2.  Geometry of the 2D axisymmetric numerical model

    图 3  不同无量纲相对渗透系数指数ωDk对应的无量纲水头增量uDsDtD的变化(a)以及$\frac{\partial u_{\mathrm{D}}}{\partial t_{\mathrm{D}}} $和$\frac{\partial s_{\mathrm{D}}}{\partial t_{\mathrm{D}}} $随tD的变化(b)

    非饱和带取样点rD=0.1, zD=0.1,参数ωDc=1, b1D=ψDa-ψDk=0;饱和带取样点rD=0.1, zD=-0.1,参数ωDc=1, b1D=ψDa-ψDk=0。图中虚线代表基于Gardner模型所求得的不同ωD对应的解

    Figure 3.  For different values of the dimensionless relative hydraulic conductivity exponent ωDk: the dimensionless hydraulic head increments uD and sD vs. the dimensionless time tD (a); $\frac{\partial u_{\mathrm{D}}}{\partial t_{\mathrm{D}}} $ and $\frac{\partial s_{\mathrm{D}}}{\partial t_{\mathrm{D}}} $ vs. tD (b)

    图 4  不同无量纲持水指数ωDc对应的无量纲水头增量uDsDtD的变化(a)以及$\frac{\partial u_{\mathrm{D}}}{\partial t_{\mathrm{D}}} $和$\frac{\partial s_{\mathrm{D}}}{\partial t_{\mathrm{D}}} $随tD的变化(b)

    非饱和带取样点rD=0.1, zD=0.1,参数ωDk=3, b1D=ψDa-ψDk=0;饱和带取样点rD=0.1, zD=-0.1,参数ωDk=3, b1D=ψDa-ψDk=0。图中虚线代表基于Gardner模型所求得的不同ωD对应的解

    Figure 4.  For different values of the dimensionless moisture retention exponent ωDc: the dimensionless hydraulic head increments uD and sD vs. the dimensionless time tD (a); $\frac{\partial u_{\mathrm{D}}}{\partial t_{\mathrm{D}}} $ and $\frac{\partial s_{\mathrm{D}}}{\partial t_{\mathrm{D}}} $ vs. tD (b)

    图 5  不同b1D=ψDa-ψDk对应的无量纲水头增量uD(a)和sD(b)随tD的变化

    a.取样点rD=0.1, zD=0.1, 参数ωDk=3, ωDc=1; b.取样点rD=0.1, zD=-0.1, 参数ωDk=3, ωDc=1

    Figure 5.  Dimensionless hydraulic head increments uD (a) and sD(b) vs. the dimensionless time tD for different values of b1D=ψDa-ψDk

    图 6  tD∈[200, 250)期间施加ID=1时,不同无量纲相对渗透系数指数ωDk对应的时间无量纲水头增量uD(a)和sD(b)随tD的变化

    a.取样点rD=0.1, zD=0.1,参数ωDc=3, b1D=ψDa-ψDk=0;b.取样点rD=0.1, zD=-0.1,参数ωDc=3, b1D=ψDa-ψDk=0。图中虚线代表施加相同ID情况下基于Gardner模型所求得的不同ωD对应的解

    Figure 6.  For different values of the dimensionless relative hydraulic conductivity exponent ωDk: The dimensionless hydraulic head increments uD (a) and sD (b) vs. the dimensionless time tD with ID=1 during tD∈[200, 250)

    图 7  tD∈[200, 250)期间施加ID=1时,不同无量纲持水指数ωDc对应的无量纲水头增量uD(a)和sD(b)随tD的变化

    a.取样点rD=0.1, zD=0.1,参数ωDk=0.5, b1D=ψDa-ψDk=0;b.取样点rD=0.1, zD=-0.1,参数ωDk=0.5, b1D=ψDa-ψDk=0。图中虚线代表施加相同ID情况下基于Gardner模型所求得的不同ωD对应的解

    Figure 7.  For different values of the dimensionless relative hydraulic conductivity exponent ωDk: The dimensionless hydraulic head increments uD (a) and sD (b) vs. the dimensionless time tD with ID=1 during tD∈[200, 250)

    图 8  tD∈[200, 250)期间不同b1D=ψDa-ψDk对应的无量纲水头增量uD(a)和sD (b)随tD的变化

    a.取样点rD=0.1, zD=0.1,参数ωDk=1, ωDc=3;b.取样点rD=0.1, zD=-0.1,参数ωDk=1, ωDc=3;实线为施加ID=1的情况,虚线为不施加ID的情况

    Figure 8.  Dimensionless hydraulic head increments uD (a) and sD (b) vs. the dimensionless time tD for b1D=ψDa-ψDk with ID=1 during tD∈[200, 250) (solid curves) and without ID (dotted curves)

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  • 收稿日期:  2022-12-22
  • 录用日期:  2023-04-12
  • 修回日期:  2023-03-16

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