Semi-analytical solutions for flow to a well in an unconfined-fractured aquifer system

Sedghi, Mohammad; Samani, Nozar

doi:10.1016/j.advwatres.2015.05.018

Cited by 13 publications

(8 citation statements)

References 36 publications

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“…In this section, the time-drawdown responses of the three-layer aquifer system are investigated by generating the dimensionless drawdown-time type curves. The dimensionless drawdown data are obtained via numerical inverse Laplace (De Hoog et al, 1982) and Hankel (Michels, 1963;Press et al, 1992) transforms following the method outlined by Sedghi and Samani (2015). Type curves for conceptual Model I and Model II ( Fig.…”

Section: Resultsmentioning

confidence: 99%

“…We consider unconfined aquifers that are hydraulically connected to underlying fractured aquifers, examples of which are found in different parts of the world (Al-Shaibani, 2008;Milanovic and Aghili, 1993;Sedghi and Samani, 2015;Subyani, 2004;Wagner, 2011). Often, an aquitard separates the unconfined aquifer from the underlying fractured aquifer.…”

Section: Introductionmentioning

confidence: 99%

“…The free surface boundary condition requires some care in aquifer modeling. The instantaneous drainage model of Neuman (1972Neuman ( , 1974 was employed in many models (Malama et al, 2007(Malama et al, , 2008Samani and Sedghi, 2015;Sedghi and Samani, 2015). The alternative of gradual watertable drainage was presented by Moench (1995Moench ( , 1996Moench ( , 1997 and adopted in the solutions of Zhan and Zlotnik (2002) and Sedghi et al (2009).…”

Section: Introductionmentioning

confidence: 99%

“…When applied to data from the glacial out-wash aquifer in Cape Cod reported by Moench et al (2000), the models of Neuman (1972Neuman ( , 1974, Moench (1995Moench ( , 1996Moench ( , 1997 and Tartakovsky and Neuman (2007) failed to achieve reasonable estimates of the specific yield (Malama, 2011 Modeling of fractured aquifers and reservoirs is a long-standing research topic. The dual porosity concept presented by Barenblatt et al (1960) is often used to describe fractured aquifer/reservoir hydraulics/dynamics (Bourdet and Gringarten, 1980;Gringarten et al, 1981;Deruyck et al, 1982;Park and Zhan, 2003;Sedghi and Samani, 2010;Sedghi and Samani, 2015). For example, Warren and Root (1963) used steady state inter-porosity flow to characterize the behavior of naturally fractured reservoirs.…”

Section: Introductionmentioning

confidence: 99%

“…If the pumping well is screened in the overlying unconfined aquifer (conceptual Model I, Fig. 1a), the boundary conditions at the pumping well are (Malama et al, 2007(Malama et al, , 2008Sedghi and Samani, 2015):…”

Section: Introductionmentioning

confidence: 99%

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Semi-analytical solution of flow to a well in an unconfined-fractured aquifer system separated by an aquitard

Sedghi

Samani

Barry

2018

Journal of Hydrology

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Semi-analytical solutions are presented for flow to a well in an extensive homogeneous and anisotropic unconfined-fractured aquifer system separated by an aquitard. The pumping well is of infinitesimal radius and screened in either the overlying unconfined aquifer or the underlying fractured aquifer. An existing linearization method was used to determine the watertable drainage. The solution was obtained via Laplace and Hankel transforms, with results calculated by numerical inversion. The main findings are presented in the form of non-dimensional drawdown-time curves, as well as scaled sensitivity-dimensionless time curves. The new solution permits determination of the influence of fractures, matrix blocks and watertable drainage parameters on the aquifer drawdown. The effect of the aquitard on the drawdown response of the overlying unconfined aquifer and the underlying fractured aquifer was also explored. The results permit estimation of the unconfined and fractured aquifer hydraulic parameters via type-curve matching or coupling of the solution with a parameter estimation code. The solution can also be used to determine aquifer hydraulic properties from an optimal pumping test set up and duration.

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Section: Resultsmentioning

confidence: 99%