We present a novel method to estimate the hydraulic and storage properties of a heterogeneous aquifer system using pilot‐point‐based hydraulic tomography (HT) inversion in conjunction with a geophysical a priori model. The a priori model involved a soil stratification obtained by combining electrical resistivity tomography inversion and field data from hydrogeological experiments. Pilot‐point densities were assigned according to the stratification, which also constrained aquifer parameters during HT inversion. The forward groundwater flow model, HydroGeoSphere, was supplied to the parameter‐estimation tool, PEST, to perform HT inversion. The performance of our method was evaluated on a hypothetical, two‐dimensional, multi‐layered, granitic aquifer system representative of those commonly occurring in the Kandi region in Telangana. Inversion results were compared using two commonly adopted methods of modeling parameter‐heterogeneity: (1) using piece‐wise zones of property values obtained from geostatistical interpolation of local‐scale estimates; and (2) HT inversion starting from a homogeneous parameter field with a uniform distribution of pilot‐points. Performances of the inverted models were evaluated by conducting independent pumping tests and statistical analyses (using a Taylor diagram) of the model‐to‐measurement discrepancies in drawdowns. Our results showed that using the aforementioned geophysical a priori model could improve the parameter‐estimation process.

中文翻译：

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基于先验模型的基于先导点的液压层析成像的性能

我们提出了一种新颖的方法，结合基于地球物理先验模型的先导点水力层析成像（HT）反演，来估算非均质含水层系统的水力和存储特性。先验模型涉及通过将电阻率层析成像反演和水文地质实验的现场数据相结合而获得的土壤分层。根据分层分配了先导点密度，这也限制了HT反演期间的含水层参数。向前的地下水流模型HydroGeoSphere被提供给参数估计工具PEST，以进行HT反演。我们的方法的性能是在假设的二维多层多层花岗岩含水层系统上进行评估的，该系统代表了Telangana坎迪地区常见的储层。使用两种常用的参数异质性建模方法对反演结果进行了比较：（1）使用从局部规模估计的地统计插值获得的属性值的分段区域；（2）HT反演是从具有均匀分布的导频点的均匀参数字段开始的。倒置模型的性能是通过对抽提中的模型与测量差异进行独立的抽水测试和统计分析（使用泰勒图）进行评估的。我们的结果表明，使用上述地球物理先验模型可以改善参数估计过程。（2）HT反演是从具有均匀分布的导频点的均匀参数字段开始的。倒置模型的性能是通过对抽提中的模型与测量差异进行独立的抽水测试和统计分析（使用泰勒图）进行评估的。我们的结果表明，使用上述地球物理先验模型可以改善参数估计过程。（2）HT反演是从具有均匀分布的导频点的均匀参数字段开始的。倒置模型的性能是通过对抽提中的模型与测量差异进行独立的抽水测试和统计分析（使用泰勒图）进行评估的。我们的结果表明，使用上述地球物理先验模型可以改善参数估计过程。