: Paleoclimatology: dune

geomorphological structure > dune system > dune

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dune

A dune is a landform composed of wind- or water-driven sand. It typically takes the form of a mound, ridge, or hill. Dunes occur in different shapes and sizes, but most kinds of dunes are longer on the stoss (upflow) side, where the sand is pushed up the dune, and have a shorter slip face in the lee side. The valley or trough between dunes is called a dune slack. Dunes are most common in desert environments, where the lack of moisture hinders the growth of vegetation that would otherwise interfere with the development of dunes. However, sand deposits are not restricted to deserts, and dunes are also found along sea shores, along streams in semiarid climates, in areas of glacial outwash, and in other areas where poorly cemented sandstone bedrock disintegrates to produce an ample supply of loose sand. (Adapted from: https://en.wikipedia.org/wiki/Dune)

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