Flow dimension as an indicator of hydraulic behavior in site characterization of fractured rock

Ground Water
A Kuusela-LahtinenA Luukkonen

Abstract

We examine the possibility of using the flow dimension identified from constant pressure injection tests as a tool for characterizing the hydraulic conditions of fractured media. The data comes from a low-conductivity crystalline rock site, from depths of up to 450 m, and is obtained with 2 m and 10 m measurement scales. In the analysis, the general solution for n-dimensional flow by Barker (1988) is applied. The results show that the most prominent characteristics of the medium can be identified; that is, linear and sublinear flow dimensions as distinguished from dimensions higher than two. In many cases, however, there is significant difficulty in distinguishing the dimensions n = 2, 2.5, and 3 from each other. This is usually because of the experimental difficulties in achieving the ideal conditions required by the theory during the early part of the experiment. In such cases, a full flow curve is not available for the type-curve fitting. In the nonunique cases the higher dimensions typically correspond to higher, sometimes unrealistically high, values of specific storage and to the less reliable and less representative early part of the experiment. Therefore, most of the dimensions in categories n = 3 can be excluded, thus ...Continue Reading

References

Aug 11, 1992·The American Journal of Medicine·D L Geier, P B Miner
Jan 1, 1995·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·M Singh, S Ceccarelli

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Citations

Mar 19, 2013·Journal of Contaminant Hydrology·N E OdlingA Kilpatrick
Jun 3, 2009·Ground Water·Timotej Verbovsek
Sep 17, 2009·Ground Water·Nathalie CourtoisAïssata Tapsoba
Dec 4, 2012·Ground Water·Dale O BowmanRobert M Holt

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