Drainage development, neotectonics and base-level change in the Kalahari Desert, southern Africa

David Nash, Frank Eckardt

Research output: Contribution to journalArticle

Abstract

The Kalahari Desert contains extensive networks of ephemeral and fossil drainage which are potential indicators of past and present neotectonic activity and climatedriven environmental change. An absence of topographic data has hindered our understanding of their development. We present long-profile information for twentynine valley networks derived from Shuttle Radar Topographic Mission (SRTM) digital elevation data. In total, 8354 km of valley talweg was measured for x, y and z information. Most valleys exhibit concave-up profiles. Fifty-five previously unknown knickpoints were identified. The majority coincide with lithological boundaries or fractures, but many developed in response to Neogene uplift and/or downwarping or occur where valleys cross palaeolake shorelines. The headwaters of four valleys cross the Kalahari–Limpopo drainage divide and predate the presumed Miocene uplift of the Kalahari–Zimbabwe axis, suggesting that they are of considerable antiquity.
Original languageEnglish
Pages (from-to)308-320
Number of pages13
JournalSouth African Geographical Journal
Volume98
Issue number2
DOIs
Publication statusPublished - 13 Apr 2015

Bibliographical note

This is an Accepted Manuscript of an article published by Taylor & Francis in South African Geographical Journal on 13/04/2015, available online: http://www.tandfonline.com/10.1080/03736245.2015.1028987

Keywords

  • long-profile
  • drainage development
  • SRTM
  • neotectonics
  • Kalahari Desert

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