3D infiltration dynamics in an initially dry sandy soil: interactive soil hydraulic-geophysical interpretation

Ganz, Christina und Noell, Ursula und Bachmann, Jörg und Lamparter, Axel und Duijnisveld, Wilhelmus .H.M. (2011) 3D infiltration dynamics in an initially dry sandy soil: interactive soil hydraulic-geophysical interpretation. In: Jahrestagung der DBG 2011: Böden verstehen - Böden nutzen - Böden fit machen, 03.-09.09.2011, Berlin.

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Kurzfassung

To assess water transport dynamics in a poorly structured homogeneous sandy soil, labour-intensive TDR and tensiometer measurements were conducted during a double tracer ponding experiment. Water transport was also observed by 3D-ERT measurements. The excavated soil profile showed a cone-shaped infiltration zone with depth, contrary to an expected tracer pattern in sand. Water content changes showed highest water contents at the wetting front, referred to as saturation overshoot. This non-monotonic pattern is likely to have been caused by reduced wettability of the soil material, which reduces capillary forces during the infiltration. Independent ERT-data showed the same infiltration pattern during ponding, but could not detect the saturation profile due to gradient smoothing during the inversion process.

Eintragstyp:	Konferenz- oder Workshop-Beitrag ("Berichte der DBG")
Stichwörter:	infiltration, saturation overshoot, tracer, wettability, ERT
Bereiche:	Kommissionen > Kommission I: Bodenphysik und Bodenhydrologie
Benutzer:	Christina Ganz
Hinterlegungsdatum:	18 Okt 2011 19:54
Letzte Änderung:	13 Dez 2015 16:26
URI:	https://eprints.dbges.de/id/eprint/699

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