Why doesn the wind blow sand further inland and form dunes further east?
Dunes move. Historical rates are 0.6 meters per year (2 feet per year). Dunes will continue to move inland unless the effects of wind are diffused, the supply of sand decreases, vegetation overgrows dunes or an obstruction blocks inland movement. The parabolic dunes are thought to have moved up to 5 miles before becoming stabilized.
