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Accueil du site → Master → Afrique du Sud → 1995 → Rates and controls of footpath erosion in Giant’s Castle Game Reserve, KwaZulu / Natal Drakensber

University of KwaZulu-Natal (1995)

Rates and controls of footpath erosion in Giant’s Castle Game Reserve, KwaZulu / Natal Drakensber

Sumner, Paul Douglas.

Titre : Rates and controls of footpath erosion in Giant’s Castle Game Reserve, KwaZulu / Natal Drakensber

Auteur : Sumner, Paul Douglas.

Université de soutenance : University of KwaZulu-Natal

Grade : Master of Science 1995

Résumé
The Drakensberg is an important ecological and recreational resource area within southern Africa, yet little knowledge exists concerning the factors controlling soil erosion in the region. The two most important anthropogenic modifiers of natural erosion processes in the areas beyond the : Drakensberg Park main camps and access roads are vegetation burning and the erosion associated with footpaths. This dissertation investigates the rates and controls of footpath erosion in Giant’s Castle Game Reserve in the KwaZulu/Natal Drakensberg. Two measurement techniques are employed. Sediment yield and runoff were monitored from six runoff plots installed on different gradients on a high user-intensity footpath. Runoff is found to increase linearly with increasing footpath gradient. Sediment yield increases gradually with increasing footpath gradient to a threshold path gradient of 13.36°, after which sediment yield increases rapidly. Soil eroded from the runoff plots has a finer particle size distribution than the footpath tread surfaces within the plots. Rates of sediment generated from the runoff plots is dependant on the rainfall intensity index (I60), as opposed to rainfall kinetic energy or total rainfall related indices, while runoff is dependant on the El60 index. A 100m point-based survey of footpath attributes, totalling a distance of21km along four paths in the Reserve was undertaken. Where footpath gradients are low and user-intensity is high, path morphometry is dependant on orientation to the slope. Morphology of footpaths with both higher gradients and user-intensities show a dependence on path gradient.

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