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A new solution for a partially penetrating constant‐rate pumping well with a finite‐thickness skin
Author(s) -
Chiu PinYuan,
Yeh HundDer,
Yang ShawYang
Publication year - 2007
Publication title -
international journal for numerical and analytical methods in geomechanics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.419
H-Index - 91
eISSN - 1096-9853
pISSN - 0363-9061
DOI - 10.1002/nag.607
Subject(s) - dimensionless quantity , aquifer , drawdown (hydrology) , laplace transform , mechanics , constant (computer programming) , radius , sine and cosine transforms , mathematics , mathematical analysis , geology , geotechnical engineering , geometry , fourier transform , physics , groundwater , fourier analysis , computer science , computer security , short time fourier transform , programming language
A mathematical model describing the constant pumping is developed for a partially penetrating well in a heterogeneous aquifer system. The Laplace‐domain solution for the model is derived by applying the Laplace transforms with respect to time and the finite Fourier cosine transforms with respect to vertical co‐ordinates. This solution is used to produce the curves of dimensionless drawdown versus dimensionless time to investigate the influences of the patch zone and well partial penetration on the drawdown distributions. The results show that the dimensionless drawdown depends on the hydraulic properties of the patch and formation zones. The effect of a partially penetrating well on the drawdown with a negativepatch zone is larger than that with a positive patch zone. For a single‐zone aquifer case, neglecting the effect of a well radius will give significant error in estimating dimensionless drawdown, especially when dimensionless distance is small. The dimensionless drawdown curves for cases with and without considering the well radius approach the Hantush equation ( Advances in Hydroscience . Academic Press: New York, 1964) at large time and/or large distance away from a test well. Copyright © 2007 John Wiley & Sons, Ltd.