Flow channeling and analysis of tracer tests in heterogeneous porous media [electronic resource]
Flow and solute transport through porous medium with strongly varying hydraulic conductivity are studied by numerical simulations. The heterogeneity of the porous medium is defined by σ and λ′, which are, respectively, the standard deviation of natural log of permeability values and its correlation...
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Online Access |
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| Format: | Government Document Electronic eBook |
| Language: | English |
| Published: |
Berkeley, Calif. : Oak Ridge, Tenn. :
Lawrence Berkeley National Laboratory ; distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy,
2001.
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| Subjects: |
MARC
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| 245 | 0 | 0 | |a Flow channeling and analysis of tracer tests in heterogeneous porous media |h [electronic resource] |
| 260 | |a Berkeley, Calif. : |b Lawrence Berkeley National Laboratory ; |a Oak Ridge, Tenn. : |b distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, |c 2001. | ||
| 300 | |a 22 pages : |b digital, PDF file. | ||
| 336 | |a text |b txt |2 rdacontent. | ||
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| 500 | |a Published through the Information Bridge: DOE Scientific and Technical Information. | ||
| 500 | |a 11/03/2001. | ||
| 500 | |a "lbnl--49153" | ||
| 500 | |a Water Resources Research 30 5 FT. | ||
| 500 | |a Tsang, Chin-Fu; Moreno, Luis. | ||
| 500 | |a USDOE. Assistant Secretary for Environmental Management. Office of Science and Technology. | ||
| 500 | |a Swedish Nuclear Fuel and Waste Management Company, Japanese Nuclear Cycle Institute BG No.93-317 (US) | ||
| 520 | 3 | |a Flow and solute transport through porous medium with strongly varying hydraulic conductivity are studied by numerical simulations. The heterogeneity of the porous medium is defined by σ and λ′, which are, respectively, the standard deviation of natural log of permeability values and its correlation range λ divided by transport distance L. The development of flow channeling as a function of these two parameters is demonstrated. The results show that for large heterogeneities, the flow is highly channelized and solute is transported through a few fast paths, and the corresponding breakthrough curves show a high peak at very early times, much shorter than the mean residence time. This effect was studied for a converging radial flow, to simulate tracer tests in a fracture zone or contact-thickness aquifer. It is shown that σ²λ′ is an appropriate parameter to characterize the tracer dispersion and breakthrough curves. These results are used to study tracer breakthrough data from field experiments performed with nonsorbing tracers. A new procedure is proposed to analyze the results. From the moments of the residence-time distribution represented by the breakthrough curves, the heterogeneity of the porous medium, as characterized by σ²λ′ and the mean residence time t{sub o}, may be determined. | |
| 536 | |b AC03-76SF00098. | ||
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| 650 | 7 | |a Transport. |2 local. | |
| 650 | 7 | |a Solutes. |2 local. | |
| 650 | 7 | |a Hydraulic Conductivity. |2 local. | |
| 650 | 7 | |a Permeability. |2 local. | |
| 650 | 7 | |a Distribution. |2 local. | |
| 650 | 7 | |a Fractures. |2 local. | |
| 650 | 7 | |a Channeling. |2 local. | |
| 650 | 7 | |a Geosciences. |2 edbsc. | |
| 710 | 2 | |a Lawrence Berkeley National Laboratory. |4 res. | |
| 710 | 1 | |a United States. |b Department of Energy. |b Office of Scientific and Technical Information. |4 dst. | |
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