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Inverse Modeling of Coastal Aquifers Using Tidal Response and Hydraulic Tests

机译：利用潮汐响应和水力试验反演沿海含水层

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Remediation of contaminated aquifers demands a reliable characterization of hydraulic connectivity patterns. Hydraulic diffusivity is possibly the best indicator of connectivity. It can be derived using the tidal response method (TRM), which is based on fitting observations to a closed-form solution. Unfortunately, the conventional TRM assumes homogeneity. The objective of this study was to overcome this limitation and use tidal response to identify preferential flowpaths. Additionally, the procedure requires joint inversion with hydraulic test data. These provide further information on connectivity and are needed to resolve diffusivity into transmissivity and storage coefficient. Spatial variability is characterized using the regularized pilot points method. Actual application may be complicated by the need to filter tidal effects from the response to pumping and by the need to deal with different types of data, which we have addressed using maximum likelihood methods. Application to a contaminated artificial coastal fill leads to flowpaths that are consistent with the materials used during construction and to solute transport predictions that compare well with observations. We conclude that tidal response can be used to identify connectivity patterns. As such, it should be useful when designing measures to control sea water intrusion.
机译：修复受污染的含水层需要可靠地表征水力连通性模式。水力扩散率可能是连通性的最佳指标。可以使用潮汐响应方法（TRM）得出，该方法基于将观测值拟合到封闭形式的解决方案中。不幸的是，传统的TRM假定是同质的。这项研究的目的是克服这一局限性，并利用潮汐响应来识别优先流动路径。另外，该程序需要联合反演和水力测试数据。这些提供了有关连通性的更多信息，并且是将扩散率解析为透射率和存储系数所必需的。空间变异性是使用正则导频点方法来表征的。实际应用可能由于需要从对抽水的响应中过滤潮汐影响以及需要处理不同类型的数据而变得复杂，我们已经使用最大似然方法解决了这些问题。将其应用于受污染的人工沿海填充物会导致流动路径与施工期间使用的材料一致，并导致溶质运移预测与观测结果相吻合。我们得出结论，潮汐反应可用于识别连通性模式。因此，在设计控制海水入侵的措施时应该很有用。

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