Aquifer Parameter Estimation for a Constant-Flux Test Performed in a Radial Two-Zone Aquifer
Publication: Journal of Irrigation and Drainage Engineering
Volume 135, Issue 5
Abstract
A patchy aquifer or an aquifer with a finite thickness skin can be considered as a radial two-zone aquifer system, which can be characterized by five parameters, i.e., the thickness of the first zone and four aquifer parameters including the transmissivity and storage coefficient for each of the first and second zones. This paper proposes an approach based on an analytical solution of a constant-flux pumping in a confined two-zone aquifer and the simulated annealing algorithm to determine the five parameters simultaneously. The estimated results for the five parameters are fairly good even assuming the aquifer as a single-zone system at the beginning of the data analysis. The estimated results indicate that the first-zone parameters are much more difficult to accurately identify than the second-zone parameters due to insufficient early-time data and high correlation of the sensitivities among the first-zone parameters. However, the problem of inaccurate results obtained at the first-zone can be significantly improved if more densely temporal drawdown measurements are used.
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Acknowledgments
This study was partly supported by the Taiwan National Science Council under Grant No. UNSPECIFIEDNSC 96–2221–E–009–087-MY3. The writers would like to thank the two anonymous reviewers for their constructive comments and suggested revisions.
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Information
Published In
Journal of Irrigation and Drainage Engineering
Volume 135 • Issue 5 • October 2009
Pages: 693 - 703
Copyright
© 2009 ASCE.
History
Received: Feb 18, 2008
Accepted: Jan 16, 2009
Published online: Sep 15, 2009
Published in print: Oct 2009
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