Three-dimensional deformation and strain induced by municipal pumping, Part 2: Numerical analysis
Three-dimensional deformation and strain induced by municipal pumping, Part 2: Numerical analysis
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DOI：
10.1016/j.jhydrol.2006.03.035
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发表时间：
2006-11
影响因子：
6.4
通讯作者：
T. Burbey
中科院分区：
文献类型：
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作者：
T. Burbey
作为在内华达州梅斯奎特进行的为期62天的受控含水层测试的一部分，收集了现场测量数据，其中包括一口市政井的水位以及在距井不同径向距离的高精度全球定位系统测量的三维地表变形和应变。这些测量被用作几个数值模型和参数估计代码中的观测值，以描述和约束400米厚的盆地充填含水层的水力和力学特性。在对含水层系统进行概念化时，采用了一种节俭的办法。尽管如此，校准的变形和流动模型的结果准确地再现了抽水前20天的观测水头和变形，也就是达到新平衡的时间。表面变形反映了水力各向异性和主电导率的方向。在现场没有监测井资料的情况下，对抽水影响半径和压降锥体进行了近似计算。敏感性分析表明，周期性水头值对水平导水率的变化最敏感，而随时间变化的垂直变形对骨骼比容的变化最敏感。这项调查表明，GPS监测可以取代昂贵的监测井来确定含水层的特征，用于水管理目的，因为那里的骨骼变形往往是弹性的。
Field measurements consisting of water levels from a municipal well and three-dimensional surface deformations and strains from high-precision GPS measurements at various radial distances from the well were collected as part of a 62-day controlled aquifer test at Mesquite, NV. These measurements were used as observations in several numerical models and a parameter estimation code to characterize and constrain hydraulic and mechanical properties of a 400m thick basin-fill aquifer. A parsimonious approach was used in conceptualizing the aquifer system. Nonetheless, results from the calibrated deformation and flow models accurately reproduced the observed head and deformations during the first 20 days of pumping, the time at which a new equilibrium was achieved. Surface deformations were shown to reflect hydraulic anisotropy and direction of principal conductivity. In addition, the radius of influence and cone of depression from pumping was approximated in spite of the fact that no monitoring well data existed at the site. Sensitivity analysis indicates that cyclical head values are most sensitive to changes in horizontal hydraulic conductivity, while time-dependent vertical deformations are most sensitive to changes in skeletal specific storage. This investigation shows that GPS monitoring can be used in place of costly monitoring wells to characterize aquifers for water-management purposes where skeletal deformation tends to be elastic.