A Geophysical Analysis of Hydro-geomorphic Controls Within a Headwater Wetland in a Granitic Landscape, Through ERI and IP

TitleA Geophysical Analysis of Hydro-geomorphic Controls Within a Headwater Wetland in a Granitic Landscape, Through ERI and IP
Publication TypeJournal Article
Year of Publication2010
AuthorsRiddell E.S, Lorentz S.A, Kotze D.C
JournalHydrology and Earth System Sciences
Volume14
Pagination1697-1713
ISBN Number1027-5606
Accession NumberWOS:000281432500020
Keywordscatchment, electrical-resistivity tomography, lithology, south-africa
Abstract

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.

Short TitleHydrol Earth Syst ScHydrol Earth Syst Sc
Alternate JournalHydrol Earth Syst Sc