Abstract
The patches of active, nested parabolic dunes occur within a vegetation-stabilized linear dune field between two ephemeral rivers. Post-12,000 years B.P. transverse bedforms and a bidirectional palaeowind regime are thought to have led to the formation of the linear dunes. Water retained within higher dunes promotes tree growth, particularly where large linear and transverse bedforms intersect. Deflation of sand beneath these tree concentrations is assisted by biological processes, producing nested parabolic bedforms which migrate slowly southwards under weak northerly winds.
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