A semi-analytical solution for groundwater flow-field delineation near pumping/injection wells in confined aquifers

Bica, Ioan; Boukhemacha, Mohamed Amine; Groza, Ghiocel

A semi-analytical solution for groundwater flow-field delineation near pumping/injection wells in confined aquifers | Une solution semi-analytique pour la délimitation du champ d’écoulement des eaux souterraines à proximité des puits de pompage/injection dans les aquifères captifs Una solución semi-analítica Para el trazado del campo de flujo del agua subterránea cerca de pozos de bombeo/inyección en acuíferos confinados حل شبه تحليلي لتخطيط حقول جريان المياه الجوفية قرب أبار الضخ/الحقن في الطبقات المائية المحتجزة 采用半解析方法描述承压含水层抽水井/注入井附近地下水水流场 Solução semianalítica para delimitação do campo de escoamento originado por poços em aquíferos confinados O soluție semi-analitică pentru delimitarea curentului apei subterane în vecinătatea puțurilor de pompare/injecție în acvifere sub presiune

2019

Bica, Ioan | Boukhemacha, Mohamed Amine | Groza, Ghiocel

A new semi-analytical solution to study groundwater flow fields associated with pumping or injection wells in confined isotropic aquifers with uniform regional flow is proposed and tested against steady-state and transient-state numerical simulations on MODFLOW-MODPATH. The solution is based on the complex potential theory and can be used for large numbers of arbitrarily positioned wells operated with different rates. The solution can be used to follow the movement of water particles in space (within pores or within the equivalent continuous media) and in time with two tracking modes: forward (from origin to target) and backward (from target to origin). The proposed solution is a useful tool that can be used for establishing groundwater resources management practices like designing groundwater remediation solutions, delineating capture zones, defining safeguard perimeters and mapping groundwater vulnerability. Moreover, the paper gives a comparative numerical study of flow fields near pumping wells, showing that, in terms of their shape and position, delineating capture zones using either steady-state or transient-state simulations would lead to practically similar results for long pumping periods. It is also shown that in such cases, the main differences between steady-state and transient-state simulation are present in the computed water particles’ transport time.

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