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

JOURNAL OF HYDROLOGY

卷:559

Article

Sedghi, Mohammad M.¹  Samani, Nozar²  Barry, D. A.³ 

[1] Payame Noor Univ, Dept Geol, Tehran 193953697, Iran

[2] Shiraz Univ, Dept Earth Sci, Shiraz 71454, Iran

[3] Ecole Polytech Fed Lausanne, Fac Architecture Civil & Environm Engn ENAC, Environm Engn Inst IIE, Ecol Engn Lab ECOL, CH-1015 Lausanne, Switzerland

关键词: Three layer-aquifer;    Unconfined aquifer;    Aquitard;    Fractured aquifer;    Leakage;    Laplace-Hankel transform;   

DOI  :  10.1016/j.jhydrol.2018.03.012

来源: Elsevier

【 摘 要 】

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. (C) 2018 Elsevier B.V. All rights reserved.

【 授权许可】

Free