18 Sep 2023
 | 18 Sep 2023
Status: this preprint is open for discussion.

Technical Note: Analytical Solution for Well Water Response to Earth Tides in Leaky Aquifers with Storage and Compressibility in the Aquitard

Rémi Valois, Agnès Rivière, Jean-Michel Vouillamoz, and Gabriel C. Rau

Abstract. In recent years, there has been a growing interest in utilizing the groundwater response to Earth tides as a means to estimate subsurface properties. However, existing analytical models have been insufficient in accurately capturing realistic physical conditions. This study presents a new analytical solution to calculate groundwater response to Earth tide strains, including storage and compressibility of the aquitard, borehole storage and skin effects. We investigate the effects of aquifer and aquitard parameters on well water response to Earth tides at two dominant frequencies (O1 and M2) and compare our results with hydraulic parameters obtained from a pumping test. Inversion of the six hydro-geomechanical parameters from amplitude response and phase shift of both semi-diurnal and diurnal tides provides relevant information about aquifer transmissivity, storativity, well skin effect, aquitard hydraulic conductivity and diffusivity. The new model is able to reproduce previously unexplained observations of the amplitude and frequency responses. We emphasize the usefulness in developing relevant methodology to use the groundwater response to natural drivers for characterizing hydrogeological systems.

Rémi Valois et al.

Status: open (until 13 Nov 2023)

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Rémi Valois et al.

Rémi Valois et al.


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Short summary
Characterizing aquifer systems is challenging because it is difficult to obtain in-situ information. They can be however characterized using natural forces such as Earth tides. Models that accounts for more complex situations are still necessary to extend the use of Earth tides to assess hydromechanical properties of aquifer systems. Such a model is developed in this study and applied to a case study in Cambodia where a combination of tides was used in order to better constrain the model.