Viscous Flow Approach to “Pushing Out Old Water” from Undisturbed and Repacked Soil Columns

Bogner, Christina; Germann, Peter (2019). Viscous Flow Approach to “Pushing Out Old Water” from Undisturbed and Repacked Soil Columns. Vadose zone journal, 18(1) Soil Science Society of America SSSA 10.2136/vzj2018.09.0168

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The application of bromide tracer in transient infiltration–drainage experiments on undisturbed and repacked soil columns revealed distinct delays of tracer front arrivals with respect to the wetting front arrivals. A viscous flow approach was matched to the flow data that resulted in the parameters film thickness F and specific contact area L of the mobile water with the stagnant parts of the porous medium. Various combinations of F and L were related to the tracer delays, where the combinations L ́F, L ́F3, and L ́F2 increasingly showed the highest cor-relation. The volume of mobile water was turned over 3.8 to 29.5 times between the arrivals of the wetting fronts and the arrivals of the tracer fronts. The delays and their statistical interpretations in view of the viscous flow approach are con-sidered a significant contribution to the understanding of the phenomenon of “pushing out old water” that is still obscured in the hydrology of hillslopes and catchments. Despite the lack of a satisfying explanation for the high numbers of mobile-water turnovers, the fact that the phenomenon of “pushing out old water” already occurs in soil columns may stimulate its investigation at the soil profile scale.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Geography > Physical Geography > Unit Soil Science
08 Faculty of Science > Institute of Geography
08 Faculty of Science > Institute of Geography > Physical Geography
08 Faculty of Science > Other Institutions > Emeriti, Faculty of Science

UniBE Contributor:

Germann, Peter

Subjects:

500 Science
900 History > 910 Geography & travel

ISSN:

1539-1663

Publisher:

Soil Science Society of America SSSA

Language:

English

Submitter:

Thomas Reist

Date Deposited:

13 Feb 2020 14:39

Last Modified:

16 Feb 2020 02:49

Publisher DOI:

10.2136/vzj2018.09.0168

BORIS DOI:

10.7892/boris.139523

URI:

https://boris.unibe.ch/id/eprint/139523

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