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Fig. 2.11
The disposing patterns of sand barrier of the windward slopes of crescent dunes
Fig. 2.12
The disposing patterns of sand barriers on the semi-lunar dune chains
not protected by the barrier be moved by the wind. The sand on this part will then
fall into the leeward slope of sand dunes (Fig. 2.11 ).
The patterns of sand barriers on semi-lunar dune chains are more complex
(Fig. 2.12 ).
On the various sections of semi-lunar dune chains, sand barrier can be set up in
the same fashion as on individual semi-lunar dunes, but where two dunes link up, the
parallel linear-shaped sand barriers should be adopted because this area is a wind-
gathering area. The direction of wind here is steady and the sand-driving wind force
is strong. If the material of the sand barrier is clay, the distance between two barrier
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