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| Titel |
A geophysical analysis of hydro-geomorphic controls within a headwater wetland in a granitic landscape, through ERI and IP |
| VerfasserIn |
E. S. Riddell, S. A. Lorentz, D. C. Kotze |
| 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 ; 14, no. 8 ; Nr. 14, no. 8 (2010-08-31), S.1697-1713 |
| Datensatznummer |
250012409
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| Publikation (Nr.) |
 copernicus.org/hess-14-1697-2010.pdf |
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| Zusammenfassung |
| Wetlands are undergoing considerable degradation in South Africa. As
interventions are often technical and costly, there is a requirement to
develop conceptual process models for these wetland systems so that
rehabilitation attempts will be successful. This paper presents an approach
using the geophysical methods of Electrical Resistivity Imaging (ERI) and
Induced Polarization (IP) to delineate sub-surface hydro-geomorphic controls
that maintain equilibrium disconnectivity of wetland-catchment processes,
which through gully erosion are increasing the catchments connectivity
through loss of water and sediment. The findings presented here give insight
into the geomorphic processes that maintain the wetland in an un-degraded
state, this allows for the development of a conceptual model outlining the
wetland forming processes. The analysis suggests that sub-surface
clay-plugs, within an otherwise sandy substrate are created by illuviation
of clays from the surrounding hillslopes particularly at zones of valley
confinement. |
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