Regional characterisation of hydraulic properties of rock using air-lift data |
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Authors: | David Wladis Gunnar Gustafson |
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Institution: | Department of Geology, Chalmers University of Technology, S-412 96 G?teborg, Sweden Fax: +46 31 772 2053 e-mail: david@geo.chalmers.se, SE
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Abstract: | Hydrogeologic studies are commonly data-intense. In particular, estimations of hydraulic properties of hard rock often require
large amounts of data. In many countries, large quantities of hydrogeologic data have been collected and archived over the
years. Therefore, the use of existing data may provide a cost-efficient alternative to collecting new data in early stages
of hydrogeologic studies, although the available data may be considered imprecise. Initially, however, the potential usefulness,
i.e., the expected accuracy, of the available data in each specific case must be carefully examined. This study investigates
the possibilities of obtaining estimates of transmissivity from hard-rock air-lift data in Sweden within an order of magnitude
of results obtained from high-quality injection-test data. The expected accuracy of the results was examined analytically
and by means of statistical methods. The results were also evaluated by comparison with injection-test data. The results indicate
that air-lift data produce estimates of transmissivity within an order of magnitude compared to injection-test data in the
studied examples. The study also shows that partial penetration and hydrofracturing may only affect the estimations approximately
half an order of magnitude. Thus, existing data may provide a cost-efficient alternative to collection of new data in early
stages of hydrogeologic studies.
Received, January 1998 Revised, November 1998, December 1998 Accepted, December 1998 |
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Keywords: | Sweden fractured rocks hydraulic testing groundwater management groundwater statistics |
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