Hydraulic tomography analysis of municipal-well operation data with geology-based groundwater models

Tong, Xin; Illman, Walter A.; Berg, Steven J.; Luo, Ning

Hydraulic tomography analysis of municipal-well operation data with geology-based groundwater models | Analyse par tomographie hydraulique des données d’exploitation d’un puits municipal à l’aide de modèles d’eaux souterraines fondés sur la géologie Análisis por tomografía hidráulica de datos de explotación de pozos municipales con modelos de aguas subterráneas en función de la geología 采用基于地质的地下水模型的市政井运行数据的水力层析分析 Análise de tomografia hidráulica de dados de operação de poços municipais com modelos de água subterrânea baseados em geologia

2021

Tong, Xin | Illman, Walter A. | Berg, Steven J. | Luo, Ning

The sustainable management of groundwater resources is essential to municipalities worldwide due to increasing water demand. Planning for the optimized use of groundwater resources requires reliable estimation of hydraulic parameters such as hydraulic conductivity (K) and specific storage (Sₛ). However, estimation of hydraulic parameters can be difficult with dedicated pumping tests while municipal wells are in operation. In this study, the K and Sₛ of a highly heterogeneous, multi-aquifer/aquitard system are estimated through the inverse modeling of water-level data from observation wells collected during municipal well operations. In particular, four different geological models are calibrated by coupling HydroGeoSphere (HGS) with the parameter estimation code PEST. The joint analysis of water-level records resulting from fluctuating pumping and injection operations amounts to a hydraulic tomography (HT) analysis. The four geological models are well calibrated and yield reliable estimates that are consistent with previously studies. Overall, this research reveals that: (1) the HT analysis of municipal well records is feasible and yields reliable K and Sₛ estimates for individual geological units where drawdown records are available; (2) these estimates are obtained at the scale of intended use, unlike small-scale estimates typically obtained through other characterization methods; (3) the HT analysis can be conducted using existing data, which leads to substantial cost savings; and (4) data collected during municipal well operations can be used in the development of new groundwater models or in the calibration of existing groundwater models, thus they are valuable and should be archived.

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