This leeward face of the zone is called the slip face.Īs the sand in dune accumulates as described above the dune as a whole shows stratification parallel to the slip face. The wind blows sand grains up the windward side and sweeps them over the crest into the ‘wind shadow’ on the leeward side. The typical dune has a long slope on the side toward the wind and a short steeper slope on the leeward side. The resulting heap of sand enlarges the obstruction and a dune begins to grow. When the wind that is blowing sand along the ground encounters an obstruction such as a boulder or a bush, its forward energy is decreased and some of the sand comes to rest. Sand dunes are accumulations or mounds or heaps of sand deposited by wind. After reading this article you will learn about the meaning and types of sand dunes.
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