Approximation for the exponential integral (Theis well function)
Barry, D. A.; Parlange, J.-Y.; Li, L.
2000
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Abstract

In this note, we provide an analytical approximation to the exponential integral valid for all values of its argument. The approximation is constructed by interpolation between the exponential integral's small and large asymptotes.The interpolation contains an unknown function, which is determined using the minimax criterion. The maximum error in the approximation is less than 0.07%, making it useful for routine hydrological applications.

Details

Title Approximation for the exponential integral (Theis well function)
Author(s) Barry, D. A. ; Parlange, J.-Y. ; Li, L.
Published in Journal of Hydrology
Volume 227
Issue 1-4
Pages 287-291
Date 2000
Keywords
DOI https://doi.org/10.1016/S0022-1694(99)00184-5
Laboratories ECOL
Record Appears in Scientific production and competences > ENAC - School of Architecture, Civil and Environmental Engineering > IIE - Environmental Engineering Institute > ECOL - Ecological Engineering Laboratory
Peer-reviewed publications
Work outside EPFL
Journal Articles
Published
Record creation date 2005-12-09

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