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The morphology and sedimentology of two uncolsolidated quaternary deloris slope deposits in the Alexandria District, Cape Province

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dc.contributor.author Illgner PM en
dc.date.accessioned 2016-09-22T08:13:31Z
dc.date.available 2016-09-22T08:13:31Z
dc.date.created 1992 en
dc.date.submitted 1995 en
dc.identifier.uri http://hdl.handle.net/20.500.11892/25534
dc.description.abstract Research on hillslope surface processes and hillslope stratigraphy has been neglected in Southern Africa. The amount of published literature on hillslope stratigraphy in Southern Africa is very limited. Hillslope sediments provide a record of past environmental conditions and may be especially useful in calculating the recurrence interval of extreme environmental conditions such as earthquakes and intense rainfall events. The characteristics of hillslope sediments provide information as to their origin, transport and mechanisms of deposition. No published work could be found that had been undertaken on hillslope surface processes or stratigraphy in the eastern Cape coastal region. This study attempted to fill this gap in the geomorphic literature for Southern Africa. The surface processes acting on hillslope at Burchleigh and Spring Grove in the Alexandria district of the eastern Cape were examined in terms of slope morphology, surface sediment characteristics and the internal geometry of the hillslope sedimentary deposits. The late Quaternary hillslope sedimentary deposits at the two study sites are composed of fine grained colluvial sediments intercalated with highly lenticular diamicts. The fine grained colluvial sediments were emplaced by overland flow processes while the diamicts were deposited by debris flows. The sedimentary sequences at both study sites have a basal conglomerate interpreted as a channel lag deposit. Most slope failures preceding debris flow events were probably triggered by intense or extended periods of rainfall associated with cold fronts or cut-off lows. Seismic events may also have triggered slope failure, with or without the hillslope sediments being saturated. The results of this study indicate that a continuum exists between the slopewash dominated processes of the presently summer rainfall regions of Natal to the present winter rainfall regions of the western Cape where mass movement processes are significant. Hillslope deposits, therefore, provide a record of environmental conditions which may greatly facilitate proper management of the landscape. en
dc.language English en
dc.subject Geography, human and regional en
dc.subject Regional geography en
dc.title The morphology and sedimentology of two uncolsolidated quaternary deloris slope deposits in the Alexandria District, Cape Province en
dc.type Masters degree en
dc.description.degree MA en

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