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White, K., Bullard, J., Livingstone, I. and Moran, L. 2015. A morphometric comparison of the Namib and southwest Kalahari dunefields using ASTER GDEM data. Aeolian Research, 19(A): 87–95


Description:

A morphometric comparison of the Namib and southwest Kalahari dunefields using ASTER GDEM data.

Summary / Notes:

The increased availability of digital elevation models and satellite image data enable testing of morphometric relationships between sand dune variables (dune height, spacing and equivalent sand thickness), which were originally established using limited field survey data. These long-established geomorphological hypotheses can now be tested against very much larger samples than were possible when available data were limited to what could be collected by field surveys alone. This project uses ASTER global digital elevation model (GDEM) data to compare morphometric relationships between sand dune variables in the southwest Kalahari dunefield to those of the Namib sand sea, to test whether the relationships found in an active sand sea (Namib) also hold for the fixed dune system of the nearby southwest Kalahari. The data show significant morphometric differences between the simple linear dunes of the Namib sand sea and the southwest Kalahari; the latter do not show the expected positive relationship between dune height and spacing. The southwest Kalahari dunes show a similar range of dune spacings, but they are less tall, on average, than the Namib sand sea dunes. There is a clear spatial pattern to these morphometric data; the tallest and most closely spaced dunes are towards the southeast of the Kalahari dunefield; and this is where the highest values of equivalent sand thickness result. We consider the possible reasons for the observed differences and highlight the need for more studies comparing sand seas and dunefields from different environmental settings. Keywords: Linear dunes, Aeolian processes, Namib sand sea, Kalahari, Morphometric analysis.

Year: 2015

Type: Journal Article

URL: http://www.sciencedirect.com/science/article/pii/S1875963715000877


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