Universität zu Köln

Bogner, Christina ORCID: 0000-0003-4495-0676 and Germann, Peter (2019). Viscous Flow Approach to Pushing Out Old Water from Undisturbed and Repacked Soil Columns. Vadose Zone J., 18 (1). MADISON: SOIL SCI SOC AMER. ISSN 1539-1663

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Abstract

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 Fand L were related to the tracer delays, where the combinations L x F, L x F-3, and L x F-2 increasingly showed the highest correlation. 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 considered 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
Creators:	Creators Email ORCID ORCID Put Code Bogner, Christina UNSPECIFIED orcid.org/0000-0003-4495-0676 UNSPECIFIED Germann, Peter UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-143808
DOI:	10.2136/vzj2018.09.0168
Journal or Publication Title:	Vadose Zone J.
Volume:	18
Number:	1
Date:	2019
Publisher:	SOIL SCI SOC AMER
Place of Publication:	MADISON
ISSN:	1539-1663
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Geosciences > Geographisches Institut
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language CATCHMENT; REGRESSION Multiple languages Environmental Sciences; Soil Science; Water Resources Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/14380