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|Title:||Slug test in confined aquifers, the over-damped case: quasi-steady flow analysis||Authors:||Koussis, A.D.
|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||URI:||http://ktisis.cut.ac.cy/handle/10488/7703||ISSN:||0017467X||DOI:||10.1111/j.1745-6584.2011.00855.x||Rights:||© 2011, National Ground Water Association.||Type:||Article|
|Appears in Collections:||Άρθρα/Articles|
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