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    基于解析法和数值法的非稳定流抽水试验参数反演

    李霞 文章 梁杏 马腾 陈晨

    李霞, 文章, 梁杏, 马腾, 陈晨, 2017. 基于解析法和数值法的非稳定流抽水试验参数反演. 地球科学, 42(5): 743-750. doi: 10.3799/dqkx.2017.062
    引用本文: 李霞, 文章, 梁杏, 马腾, 陈晨, 2017. 基于解析法和数值法的非稳定流抽水试验参数反演. 地球科学, 42(5): 743-750. doi: 10.3799/dqkx.2017.062
    Li Xia, Wen Zhang, Liang Xing, Ma Teng, Chen Chen, 2017. Aquifer Parameter Estimation of Transient Pumping Test Based on Analytical and Numerical Methods. Earth Science, 42(5): 743-750. doi: 10.3799/dqkx.2017.062
    Citation: Li Xia, Wen Zhang, Liang Xing, Ma Teng, Chen Chen, 2017. Aquifer Parameter Estimation of Transient Pumping Test Based on Analytical and Numerical Methods. Earth Science, 42(5): 743-750. doi: 10.3799/dqkx.2017.062

    基于解析法和数值法的非稳定流抽水试验参数反演

    doi: 10.3799/dqkx.2017.062
    详细信息
      作者简介:

      李霞(1993-),女,硕士研究生,主要从事水文地质研究工作.ORCID:0000-0002-5730-5126.E-mail: lixiacug@126.com

      通讯作者:

      文章,ORCID:0000-0001-9672-3219.E-mail: wenz@cug.edu.cn

    • 中图分类号: P641

    Aquifer Parameter Estimation of Transient Pumping Test Based on Analytical and Numerical Methods

    • 摘要: 含水层的水文地质参数是进行地下水资源计算、地下水污染防控等所必需的基础数据,结合数值模拟技术进行含水层参数反演很有必要.按照1:5万水文地质调查规范在江汉平原仙桃市杨林尾镇复兴水厂不同含水层位开展抽水试验,包括深层含水层单孔抽水试验以及浅层含水层中群孔(2孔)抽水试验.对于单孔抽水试验,应用第1类越流系统井流理论进行参数反演;对于群孔抽水试验,推导了特定综合井函数,并利用特定标准曲线匹配法和直线图解法求解了含水层参数.随后利用FEFLOW软件建立了相应数值模型,拟合了含水层参数.结果表明:浅层含水层的渗透系数变化范围为21.66~54.00 m/d,贮水率变化范围为1.28×10-5~8.00×10-4 m-1;深层含水层渗透系数变化范围为1.27~7.00 m/d,贮水率变化范围为3.90×10-6~5.00×10-6 m-1.对于深层承压含水层而言,越流补给量较大.采用数值模拟方法结合抽水试验数据求参,综合考虑了含水层结构,拟合效果好,所得结果更加可靠.

       

    • 图  1  研究区各井平面分布

      Fig.  1.  The plan distribution of wells in study area

      图  2  特定标准曲线匹配

      Fig.  2.  The matching diagram of specific standard curve

      图  3  特定直线图解法匹配

      Fig.  3.  The matching diagram of cooper-Jacob method

      图  4  第1类越流系统水流模型匹配

      Fig.  4.  The matching type curve for the flow model in the first kind of leaky aquifer

      图  5  含水层网格剖分图(a)和含水层三维地质模型(b)

      Fig.  5.  The mesh discretization of aquifers in plan view (a) and 3-D view of aquifer geological model (b)

      图  6  浅层(a)和深层(b)孔隙承压含水层最佳拟合效果

      Fig.  6.  The simulation results for the hydraulic head in the shallow pore (a) and deep pore (b) confined aquifer

      表  1  研究区钻孔岩性及含水层划分

      Table  1.   The borehole lithology and aquifer division of the study area

      分层 底板标高(m) 层厚(m) 岩性 含水层划分
      第1层 -40 40 粉质粘土 孔隙潜水含水层
      第2层 -100 60 细砂、中砂、卵砾石 浅层孔隙承压含水层
      第3层 -138 38 粉质粘土夹细砂 弱透水层
      第4层 -160 22 细砂、中砂、粗砂夹少量粉质粘土 深层孔隙承压含水层
       注:以地面为基准面.
      下载: 导出CSV

      表  2  解析法求取浅层孔隙承压含水层参数结果

      Table  2.   The estimated results of aquifer parameters in the shallow confined aquifer with analytical method

      方法 K(m/d) 贮水系数 贮水率(m-1)
      标准曲线配比法 31.51 3.70×10-3 6.17×10-5
      直线图解法 21.66 7.70×10-4 1.28×10-5
      下载: 导出CSV

      表  3  各主要含水层拟合后水文地质参数

      Table  3.   The estimated aquifer parameters with the numerical simulation

      含水层 Kx(m/d) Ky(m/d) Kz(m/d) 贮水系数 贮水率Ss(m-1)
      浅层孔隙承压含层 54.00 54.00 5.40 3.20×10-2 8.00×10-4
      深层孔隙承压含层 7.00 7.00 0.70 1.10×10-4 5.00×10-6
      弱透水层 1.00×10-3 1.00×10-3 0.80 7.60×10-4 2.00×10-5
      下载: 导出CSV

      表  4  浅层孔隙承压含水层抽水试验水均衡

      Table  4.   The corresponding period budget for shallow confined aquifer pumping test

      流出量(m3) 流入量(m3) 自身弹性释放量(m3)
      浅层孔隙承压含水层 0.03 228.10 227.99
      下载: 导出CSV

      表  5  深层孔隙承压含水层抽水试验各主要含水层水均衡

      Table  5.   The corresponding period budget for main aquifer of deep confined aquifer pumping test

      流出量(m3) 流入量(m3) 自身弹性释放量(m3)
      弱透水层 720.77 492.83 228.01
      深层孔隙承压含水层 665.19 629.10 36.09
      下载: 导出CSV

      表  6  解析法与数值法参数结果汇总

      Table  6.   The summarization of aquifer parameters estimated by analytical and numerical methods

      含水层 方法 K(m/d) 贮水率(m-1)
      浅层孔隙承压含水层 特定标准曲线配比法 31.51 6.17×10-5
      浅层孔隙承压含水层 特定直线图解法 21.66 1.28×10-5
      浅层孔隙承压含水层 数值模拟法 54.00 8.00×10-4
      深层孔隙承压含水层 Hantush-Jacob法 1.27 3.90×10-6
      深层孔隙承压含水层 数值模拟法 7.00 5.00×10-6
      下载: 导出CSV
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    • 收稿日期:  2016-11-06
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