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| Titel |
Investigation of solute transport in nonstationary unsaturated flow fields |
| VerfasserIn |
C.-M. Chang, H.-D. Yeh |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 16, no. 11 ; Nr. 16, no. 11 (2012-11-06), S.4049-4055 |
| Datensatznummer |
250013558
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| Publikation (Nr.) |
 copernicus.org/hess-16-4049-2012.pdf |
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| Zusammenfassung |
| Most theoretical work on analyzing plume spreading
at the field scale in a partially saturated heterogeneous formation assumes
weak stationarity of velocity field. While this assumption is not applicable
to the case of a bounded flow domain, the nonstationarity in fluctuations of
unsaturated velocity fields is induced through the presence of the boundary
conditions in the flow domain. In this work, we attempt to quantify the
large-time macrodispersion in nonstationary unsaturated velocity fields
caused by the presence of a fixed head boundary condition. Application of
the perturbation-based nonstationary spectral approach leads to an
analytical expression for the macrodispersion describing the field-scale
dispersive solute flux in terms of the statistical moments of two formation
parameters: the Gardener's parameter (α) and the saturated hydraulic
conductivity (Ks). The results predicted from the expression indicate
that the enhanced unsaturated plume spreading can arise from a larger
correlation scale of ln Ks or ln α fields. In addition, the α-parameter
takes the role in reducing the field-scale plume spreading. |
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