A new solution for a partially penetrating constant-rate pumping well with a finite-thickness skin

Pin Yuan Chiu, Hund-Der Yeh*, Shaw Yang Yang

*Corresponding author for this work

Research output: Contribution to journalArticle

22 Scopus citations

Abstract

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 negative patch 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.

Original languageEnglish
Pages (from-to)1659-1674
Number of pages16
JournalInternational Journal for Numerical and Analytical Methods in Geomechanics
Volume31
Issue number15
DOIs
StatePublished - 25 Dec 2007

Keywords

  • Analytical solution
  • Constant pumping test
  • Finite fourier cosine transforms
  • Groundwater
  • Heterogeneous aquifer
  • Laplace transforms
  • Partially penetrating well

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