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- Title
An Analytical Method to Calculate Groundwater Released From an Acquitard Undergoing Nonlinear Consolidation.
- Authors
Huan Luo; Zhaofeng Li; Maolin Luo; Qiang Zhang; Illman, Walter A.
- Abstract
The estimation of groundwater released from acquitards is important for the groundwater resource management. In this study, a governing equation of drawdown variation within the acquitard, which undergoes nonlinear consolidation, was obtained based on the consolidation theory of Gibson et al. (1967, https://doi.org/10.1680/geot.1967.17.3.261). Then, analytical solutions of drawdown variations within an acquitard were derived for a single aquifer underlying an acquitard, as well as for the case when there are aquifers above and below an acquitard. Drawdown solutions were obtained for both the cases when there was a sudden hydraulic head decline in the confined aquifer(s). The characteristics of the groundwater dynamics and water balance in the acquitard have been analyzed with the analytical solution. A laboratory experiment was conducted to verify the analytical solution, and a type‐curve fitting method was presented to calculate the acquitard's hydraulic parameters. Our study revealed that the cumulative water released from the acquitard predicted by Gibson's theory (1967) is less than that obtained through Terzaghi's theory (1943). Groundwater released from the acquitard increases with increasing compression index, acquitard thickness, and drawdown of the adjacent aquifer, and with decreasing initial void ratio and initial effective stress. The time for the drawdown to reach steady state increases with increasing compression index, initial void ratio, and acquitard thickness, and with decreasing initial effective stress and hydraulic conductivity.
- Subjects
HYDRAULIC conductivity; GROUNDWATER management; ANALYTICAL solutions; AQUIFERS; GROUNDWATER; RESOURCE management
- Publication
Water Resources Research, 2020, Vol 56, Issue 9, p1
- ISSN
0043-1397
- Publication type
Article
- DOI
10.1029/2020WR027320