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Title: Slug test in confined aquifers, the over-damped case: quasi-steady flow analysis
Authors: Koussis, A.D. 
Akylas, Evangelos 
Keywords: Electronic spreadsheets;Geologic formations;Hydrogeology;Open access publishing
Category: Environmental Engineering
Field: Engineering and Technology
Issue Date: 2012
Publisher: Wiley
Source: Groundwater, 2012, Volume 50, Issue 4, pages 608–613
Abstract: In the great majority of slug tests performed in wells fully penetrating confined geologic formations, and for over-damped conditions, the response data are evaluated with the transient-flow model of Cooper et al. (1967) when the radial hydraulic conductivity K r and the coefficient of specific storage S s are to be estimated. That particular analytical solution, however, is computationally involved and awkward to use. Thus, groundwater professionals often use a few pre-prepared type-curves to fit the data by a rough matching procedure, visually or computationally. On the other hand, the method of Hvorslev (1951), which assumes the flow to be quasi-steady, is much simpler but yields only K r estimates. In this work, we develop a complete quasi-steady flow model that includes a storage balance inside the aquifer and allows estimating K r and S s simultaneously, through matching of the well response data to a type-curve. The new model approximates the model of Cooper et al. closely and has the practical advantage that its solution type-curves are generated easily using an electronic spreadsheet, so that the optimal fit of data by a type-curve can be readily automated. © 2011, The Author(s). Ground Water
ISSN: 0017467X
DOI: 10.1111/j.1745-6584.2011.00855.x
Rights: © 2011, National Ground Water Association.
Type: Article
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