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| Titel |
Identifying a parameterisation of the soil water retention curve from on-ground GPR measurements |
| VerfasserIn |
A. Dagenbach, J. S. Buchner, P. Klenk, K. Roth |
| 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 ; 17, no. 2 ; Nr. 17, no. 2 (2013-02-11), S.611-618 |
| Datensatznummer |
250017712
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| Publikation (Nr.) |
 copernicus.org/hess-17-611-2013.pdf |
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| Zusammenfassung |
| We show the potential of on-ground Ground-Penetrating Radar (GPR) to identify
the parameterisation of the soil water retention curve, i.e. its functional
form, with a semi-quantitative analysis based on numerical simulations of the
radar signal. An imbibition and drainage experiment has been conducted at the
ASSESS-GPR site to establish a fluctuating water table, while an on-ground
GPR antenna recorded traces over time at a fixed location. These measurements
allow to identify and track the capillary fringe in the soil. The typical
dynamics of soil water content with a transient water table can be deduced
from the recorded radargrams. The characteristic reflections from the
capillary fringes in model soils that are described by commonly used
hydraulic parameterisations are investigated by numerical simulations. The
parameterisations used are (i) full van Genuchten, (ii) simplified van
Genuchten with m = 1 − 1/n and (iii) Brooks–Corey. All
three yield characteristically different reflections, which allows the
identification of an appropriate parameterisation by comparing to the
measured signals. We show that for the sand used here, these signals are not
consistent with the commonly used simplified van Genuchten parameterisation
with m = 1 − 1/n. |
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