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3 results

  • 9 - Colluvial deposits and slope instability

  • Edited by Jasper Knight, University of the Witwatersrand, Johannesburg, Stefan W. Grab, University of the Witwatersrand, Johannesburg
  • Book: Quaternary Environmental Change in Southern Africa
  • Published online: 05 June 2016
  • Print publication: 23 June 2016, pp 137-152

  • Summary

    Abstract

    Slope instability results from the interplay between tectonic uplift, climate-controlled weathering, and slope form (relief). Sediments accumulate as colluvium on footslopes when under the influence of gravity, fluvial processes and mass movements, and may be affected by pedogenesis, ecosystem change and human activity. This chapter shows that colluvial form and stratigraphy cannot be uncritically assigned to particular late Pleistocene and Holocene climatic periods, because of the feedbacks associated with weathering rate, vegetation responses to climate, and slope angle. Moreover, land surface instability and colluvial formation/incision is taking place due to contemporary environmental degradation, closely related to overgrazing.