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| Titel |
Estimation of the hydraulic parameters of a confined geologic formation from slug test in fully penetrating well using a complete quasi-steady flow model in a forward and in an inverse optimal estimation procedure |
| VerfasserIn |
Evangelos Rozos, Evangelos Akylas, Antonis D. Koussis |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250084021
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| Zusammenfassung |
| Slug tests offer a fast and inexpensive means of estimating the hydraulic parameters of a
geologic formation, and are very well suited for contaminated site assessment because no
water is essentially withdrawn. 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 Kr and the coefficient of specific storage Ss 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
Kr-estimates.
Koussis and Akylas (2012) have derived a complete quasi-steady flow model that includes
a storage balance inside the aquifer and allows estimating both Kr and Ss, through matching
of the well response data to a (dimensionless) type-curve. That model approximates
the model of Cooper et al. closely and has the practical advantage that its solution
type-curves are generated very simply, even using an electronic spreadsheet. Thus,
an optimal fit of data by a type-curve can be readily embedded in an exhaustive
search. That forward procedure, however, is semi-automated; it involves repeated
computation of the quasi-steady flow solution, until finding an optimal pair of Kr
and Ss values, according to some formal criterion of optimality, or visually. In
addition, we have developed a fully automated inverse procedure for estimating the
optimal hydraulic formation parameters Kr and Ss. We test and compare these
two parameter estimation methods for the slug test and discuss their strengths and
weaknesses.
Cooper, H. H., Jr., J. D. Bredehoeft and I. S. Papadopulos. 1967. Response of a
finite-diameter well to an instantaneous charge of water, Water Resour. Res., 3(1):
263-269.
Koussis A. D. and E. Akylas (2012) Slug test analysis for confined aquifers in the
over-damped case: Quasi-steady flow model, with estimation of the specific storage
coefficient, Ground Water, 50(4): 608–613. |
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