ENGINEERING GEOLOGY | Geophysics

Gascoyne, J.K.; Eriksen, Asger

doi:10.1016/b0-12-369396-9/00201-x

Cited by 3 publications

(1 citation statement)

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“…TEM and GPR may be more effective in this situation, as they operate without contact with the medium (Kalisperi et al 2018). TEM and ERT can obtain results, i.e., water table summit depth, at greater depths because GPR surveys depend on the conductive property of the materials, and the maximum depths of investigation rarely go beyond 20 m (Beres Jr. and Haeni 1991;Asprion and Aigner 1997;Mari et al 1998;Milsom 2003;Neal 2004;Gascoyne and Eriksen 2005). In contrast, TEM and ERT can be applied from a few to hundreds of meters in depth (Galazoulas et al 2015;Kalisperi et al 2018).…”

Section: Accurately Assessing Water Levels Using Multiple Geophysical...mentioning

confidence: 99%

Using geophysical data to assess groundwater levels and the accuracy of a regional numerical flow model

2023

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The use of geophysical data to accurately determine water levels is demonstrated for an aquifer within the Saint-Narcisse moraine in the Mauricie region of southeastern Québec, Canada. Two numerical simulations were conducted using FEFLOW, one based on regional piezometric data and the other using geophysical data; the data were acquired through transient electromagnetic (TEM), electrical resistivity (ERT), and ground-penetrating radar (GPR) surveys. The threedimensional geological and groundwater flow model was based on data from 94 boreholes, 5 stratigraphic cross-sections, and 20 TEM, 6 ERT (~1.44 km) and 4 GPR (~0.97 km) surveys. Both numerical analyses confirmed the simulated water levels, and the root mean square errors obtained from the piezometric data and the multiple geophysical techniques were similar at 3.81 m and 2.76 m, respectively. Through a discrete modeling approach, this study shows that groundwater levels estimated using geophysical tools and methods and those determined by direct observation are comparable. The outcome illustrates how geophysical data can complement direct observations to provide additional hydraulic information to hydrologic modellers. Geophysical surveys provide an extensive set of soft data that can be leveraged to improve groundwater flow models and determine groundwater levels, particularly in areas characterized by limited direct piezometric information.

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