Geological controls on the formation of alluvial meanders and floodplain wetlands: The example of the Klip River, eastern Free State, South Africa

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dc.contributor.author Morris, R.
dc.contributor.author Tooth, S.
dc.contributor.author Hancox, P. J.
dc.contributor.author McCarthy, T. S.
dc.contributor.author Brandt, T.
dc.date.accessioned 2011-10-18T09:13:36Z
dc.date.available 2011-10-18T09:13:36Z
dc.date.issued 2011-10-18
dc.identifier.citation Morris , R , Tooth , S , Hancox , P J , McCarthy , T S & Brandt , T 2011 , ' Geological controls on the formation of alluvial meanders and floodplain wetlands: The example of the Klip River, eastern Free State, South Africa ' Earth Surface Processes and Landforms , pp. 797-815 . en
dc.identifier.other PURE: 180701
dc.identifier.other dspace: 2160/7610
dc.identifier.uri http://hdl.handle.net/2160/7610
dc.description Tooth, S., McCarthy, T. S., Brandt, T., Hancox, P. J., Morris, R. (2002). Geological controls on the formation of alluvial meanders and floodplain wetlands: The example of the Klip River, eastern Free State, South Africa. Earth Surface Processes and Landforms, 27 (8), 797-815. en
dc.description.abstract Floodplain wetlands are common features of rivers in southern Africa, but they have been little studied from a geological or geomorphological perspective. Study of the upper Klip River, eastern Free State, South Africa, indicates strong geological controls on the formation of alluvial meanders and associated floodplain wetlands. Along this river, pronounced and abrupt changes in valley width are strongly linked to lithological variations. Where weakly cemented sandstone crops out, the Klip has laterally eroded bedrock and carved valleys up to 1500 m wide. In these valleys, the river meanders (sinuosity up to similar to1.75) on moderate gradients (0.003), the river follows a much straighter course (sinuosity similar to1.10-1.34), and floodplains are restricted in width. Long-term landscape development in the Klip and numerous similar catchments depends on the interaction between fluvial processes in the sandstone and dolerite valleys. In the sandstone valleys, vertical erosion rates are controlled by erosion rates of the more resistant dolerites downstream. Hence, in the short- to medium-term (decades to tens of thousands of years), lateral erosion dominates over vertical erosion, with the river concomitantly planing sandstone in the channel floor and reworking floodplain sediments. The thickness of alluvial fill in the sandstone valleys is limited ( en
dc.format.extent 19 en
dc.language.iso eng
dc.relation.ispartof Earth Surface Processes and Landforms en
dc.title Geological controls on the formation of alluvial meanders and floodplain wetlands: The example of the Klip River, eastern Free State, South Africa en
dc.type Text en
dc.type.publicationtype Article (Journal) en
dc.contributor.institution Department of Sport & Exercise Science en
dc.contributor.institution Institute of Geography & Earth Sciences en
dc.description.status Peer reviewed en


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