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    Van Genuchten模型参数对降水入渗数值模拟的敏感性

    霍思远 靳孟贵

    霍思远, 靳孟贵, 2017. Van Genuchten模型参数对降水入渗数值模拟的敏感性. 地球科学, 42(3): 447-452. doi: 10.3799/dqkx.2017.034
    引用本文: 霍思远, 靳孟贵, 2017. Van Genuchten模型参数对降水入渗数值模拟的敏感性. 地球科学, 42(3): 447-452. doi: 10.3799/dqkx.2017.034
    Huo Siyuan, Jin Menggui, 2017. Effect of Parameter Sensitivity of van Genuchten Model on Numerical Simulation of Rainfall Recharge. Earth Science, 42(3): 447-452. doi: 10.3799/dqkx.2017.034
    Citation: Huo Siyuan, Jin Menggui, 2017. Effect of Parameter Sensitivity of van Genuchten Model on Numerical Simulation of Rainfall Recharge. Earth Science, 42(3): 447-452. doi: 10.3799/dqkx.2017.034

    Van Genuchten模型参数对降水入渗数值模拟的敏感性

    doi: 10.3799/dqkx.2017.034
    基金项目: 

    国家自然科学基金项目 41602246

    国家自然科学基金项目 U1403282

    详细信息
      作者简介:

      霍思远 (1988-),男,讲师,博士,主要从事地下水与环境的教学与研究.OCRID:0000-0001-8733-8829.E-mail:huosiyuan-10@163.com

      通讯作者:

      靳孟贵,OCRID:0000-0002-0125-4286.E-mail:mgjin@cug.edu.cn

    • 中图分类号: P641

    Effect of Parameter Sensitivity of van Genuchten Model on Numerical Simulation of Rainfall Recharge

    • 摘要: 详细分析不同评价指标下的van Genuchten方程参数敏感性,对于深入认识参数物理意义、合理确定参数值、提高降水入渗数值模拟准确性具有重要意义.用HYDRUS软件建立一维变饱和水分运移模型,以实际补给量、补给过程曲线和极限蒸发深度作为评价指标,采用单因素扰动分析法对van Genuchten方程各参数敏感性进行理论分析,进而选取多组参数实例,分析同一岩性类别下,不同土样土壤水力参数差异及其对入渗补给模拟结果的影响.结果表明:形状系数 (n)、土壤进气值的倒数 (α) 与极限蒸发深度呈负相关关系,是影响极限蒸发深度的显著因素;饱和含水率 (θs)、n、饱和渗透系数 (Ks) 对于入渗补给影响的敏感性较高,三者在实际土样粒径分布、干密度和孔隙性的共同影响下发生同向变动.合理的参数敏感性分析及数值模拟调参过程需结合土壤参数的物理意义来开展.

       

    • 图  1  模型上边界条件

      Fig.  1.  The upper boundary condition of model

      图  2  土壤水力参数对水分特征曲线及非饱和渗透系数的影响

      Fig.  2.  Effects of soil hydraulic parameters on soil water characteristic curve and unsaturated coefficient of permeability

      图  3  土壤水力参数对补给过程曲线的影响

      Fig.  3.  Effects of soil hydraulic parameters on recharge process curve

      图  4  补给过程曲线特征变化程度

      Fig.  4.  The variation of characteristic indexes of recharge process curve

      图  5  补给量变化程度

      Fig.  5.  The variation of recharge quantity

      图  6  土壤水力参数对总水势梯度的影响

      Fig.  6.  Effects of soil hydraulic parameters on total soil water potential gradient

      图  7  土壤水力参数对极限蒸发深度的影响

      Fig.  7.  Effects of soil hydraulic parameters on maximum evaporation depth

      图  8  不同岩性及参数条件下的补给过程曲线

      Fig.  8.  The corresponding recharge process curve of different instance parameter

      表  1  敏感性分析参数设置

      Table  1.   Parameter list of sensitive analysis

      砂质壤土θrθsα(1/cm)nKs(cm/d)
      原值0.0650.4100.075 01.890106.10
      增加0.097 5(θr+)0.615(θs+)0.112 5(α+)
      2.835(n+)
      2.58(n1+)
      159.15(Ks+)
      减小0.032 5(θr-)0.205(θs-)0.037 5(α-)1.2(n-)53.05(Ks-)
      注:数值后括号代表相应模型代号,如“n+”、“n1+”、“n-”分别代表在不改变其他参数的前提下,将n值增加50%、增加36.5%和减小36.5%.
      下载: 导出CSV

      表  2  华北平原参数实例

      Table  2.   Measured parameter of North China plain

      位置岩性编号粒径分布干密度 (g/cm3)土壤水力参数
      砂粒 (%)粉粒 (%)黏粒 (%)θrθsα(1/cm)nKs(cm/d)
      辛集182.1913.454.381.410.042 70.407 90.040 71.871 1193.96
      桃园砂壤土274.0420.165.781.580.037 40.358 50.043 71.560 958.81
      藁城356.5129.6513.841.720.039 60.325 40.033 21.289 510.28
      桃园粉砂质
      黏壤土
      132.1951.7715.991.460.055 00.376 10.006 91.591 614.51
      正定221.2960.7417.921.580.058 70.366 20.006 61.577 18.04
      正定320.1959.6820.141.630.060 40.360 30.007 21.535 55.43
      桃园壤土154.4635.679.851.390.041 30.384 20.017 01.464 641.60
      大河252.9637.149.881.470.039 80.366 70.017 91.449 430.12
      藁城341.3144.0414.681.670.043 00.328 70.015 41.385 37.40
      下载: 导出CSV
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    出版历程
    • 收稿日期:  2016-09-20
    • 刊出日期:  2017-03-15

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