Present day lunette sediment cycling at Witpan in the arid southwestern Kalahari Desert

D. S.G. Thomas, D. J. Nash, P. A. Shaw, C. Van der Post

Research output: Contribution to journalArticle

Abstract

Witpan is a pan depression in the southwestern Kalahari Desert. The pan fringing lunette dune has a number of notable characteristics: a highly active crest; the lower lunette pediment is cemented; and the lower lunette supports a highly developed and active gully system. Geomorphological and sedimentological considerations are used to evaluate the interaction of wind and water in shaping contemporary lunette processes. It is considered that like other pans in the area, groundwater activity influences pan floor sediment availability and transport, that the present highly sea-sonal climatic regime permits the interaction of aeolian transport of sediment to the dune and its return to the pan floor by water during storm events, creating a cycling process favoured by sedimentary properties that promote surface runoff.

Original languageEnglish
Pages (from-to)515-527
Number of pages13
JournalCATENA
Volume20
Issue number5
DOIs
Publication statusPublished - 1 Jan 1993

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