Valley-marginal sand dunes in the southwest Kalahari: their nature, classification and possible origins

Bullard, J.E. and Nash, D.J. (2000) Valley-marginal sand dunes in the southwest Kalahari: their nature, classification and possible origins Journal of Arid Environments, 45 (4). pp. 369-383. ISSN 0140-1963

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Abstract

This paper considers the nature, classification and possible origin of a variety of desert sand dunes which occur in association with ephemeral drainage features in the south-west Kalahari. The dune forms, which we term valley-marginal dunes, are found at the top of valley flanks, and are narrow, elongate forms with arcuate and straight planform elements which mirror the course of extant and ancient channels. Following a discussion of the major schemes used to classify different dune types, we describe the morphology and situation of these valley-marginal dunes. We suggest that whilst the basic morphometry of these dunes is similar to many other dune types, the topographic setting in which they occur is relatively unusual. We conclude that valley-marginal dunes are a previously unrecognized landform which cannot be fitted into current classificatory schemes. It is suggested that one reason for this may be the lack of an explicit temporal dimension in most dune classifications.

Item Type: Journal article
Uncontrolled Keywords: valley-marginal sand dune; south-west Kalahari; dune classification
Subjects: F000 Physical Sciences > F800 Physical Geography and Environmental Sciences > F840 Physical Geography
F000 Physical Sciences > F800 Physical Geography and Environmental Sciences > F820 Geomorphology
DOI (a stable link to the resource): 10.1006/jare.2000.0646
Faculties: Faculty of Science and Engineering > School of Environment and Technology > Applied Geosciences
Faculty of Science and Engineering > School of Environment and Technology
Depositing User: editor environment
Date Deposited: 18 Jun 2009
Last Modified: 09 May 2012 13:15
URI: http://eprints.brighton.ac.uk/id/eprint/5722

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