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Generation of 3D Spatially Variable Anisotropy for Groundwater Flow Simulations

机译:用于地下水流模拟的3D空间可变各向异性的生成

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摘要

Sedimentary units generally present anisotropy in their hydraulic properties, with higher hydraulic conductivity along bedding planes, rather than perpendicular to them. This common property leads to a modeling challenge if the sedimentary structure is folded. In this paper, we show that the gradient of the geological potential used by implicit geological modeling techniques can be used to compute full hydraulic conductivity tensors varying in space according to the geological orientation. For that purpose, the gradient of the potential, a vector normal to the bedding, is used to construct a rotation matrix that allows the estimation of the 3D hydraulic conductivity tensor in a single matrix operation. A synthetic 2D cross section example is used to illustrate the method and show that flow simulations performed in such a folded environment are highly influenced by this rotating anisotropy. When using the proposed method, the streamlines follow very closely the folded formation. This is not the case with an isotropic model.
机译:沉积单元的水力特性通常表现为各向异性,沿着层理平面而不是垂直于它们的水力传导率更高。如果沉积结构被折叠,则这种共同的特性会给建模带来挑战。在本文中,我们表明隐式地质建模技术使用的地质势梯度可以用来计算根据地质方向在空间中变化的全导水率张量。为此,电势的梯度(垂直于地层的向量)用于构建旋转矩阵,该矩阵允许在单个矩阵操作中估算3D液压传导率张量。合成的2D横截面示例用于说明该方法,并显示了在这种折叠环境中执行的流动模拟受此旋转各向异性的强烈影响。当使用所提出的方法时,流线非常紧密地遵循折叠形式。各向同性模型不是这种情况。

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  • 来源
    《Ground water》 |2015年第6期|955-958|共4页
  • 作者单位

    Univ Neuchatel, Ctr Hydrogeol & Geotherm CHYN, CH-2000 Neuchatel, Switzerland;

    Univ Neuchatel, Ctr Hydrogeol & Geotherm CHYN, CH-2000 Neuchatel, Switzerland;

    Ctr Sci & Tech, BRGM, FR-45060 Orleans 2, France;

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  • 正文语种 eng
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