426
Climatic Geomorphology
by deflation of fluvial sediments to build the external dune. On the other hand, the internal
lunettes are developed by deflation from playa deposits, accumulated after the initial
deflation stage (Goudie and Wells, 1995) (Figure 17.15).
(a)
Drainage channel
I Aeolian coversands
"'"""'"'" ......
...'........'...'.'.'.'::.:.":::'.".'.'.::'::.".:.'?'.i:i"('" ........
:""' '"
Lunette derived from deflated
channel alluvium and coversands
II
(b)
Lunette derived
from playa sediments
i
Figure 17.15. A model of lunette development caused by deflation of channel alluvium, aeolian sheets
and playa deposits (after Goudie and Wells (1995)).