TM 5-830-3/AFM 88-17, Chap. 3
Figure B-1. Types of fixed sand dunes
winds form the more typical crescent-shaped or barchan
After a dune is formed, the predominant wind may blow
transverse dune (fig B-2d).
sand over the crest to the leeward slope. By this
migration of particles the dune then moves forward: at a
rate depending on wind velocity", topography, size of
B-4. Migration of dunes
dune, and other factors. Along the Bay of Biscay on the
west coast of France, duties travel at-fates up to more
than 100 feet per year.