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In general, most dunes have a windward side and a leeward side. The windward side is the side on which wind strikes the dune, leeward is the opposite side. The force of the wind will affect the sand on the windward side differently from the leeward side.
Is more steeply sloped than the windward side.
They are known as Crescent Dunes.
The side of a sand dune facing the ocean is called leeward.
windward side.
The leeward or downwind side is known as the slipface.slipface
windward side
is more steeply sloped than the windward side
role in formation of sand dunes (in sand dune: Formation and growth of dunes)...sand brought up the windward slope. When this depositional slope is steepened to the angle of repose of dry sand (about 32°), this angle is maintained and the added sand slips down the slope or slip face. When this happens, the dune form is in equilibrium, and the dune moves forward as a whole, sand being eroded from the windward side and deposited on the lee.
The windward side. Windward, the direction from which the wind is blowing; facing the wind. as opposed t leeward which is aka wind shadow, where air is not able to move material and allows it to accumulate and build up, think sand dune.
In regards to "sand dunes" they migrate in the direction of the wind as sand particles being individually light can travel on the wind in forms of "sand storms" and therefore migrate overtime, create new dunes or reshape existing dune structures by either adding or withdrawing sand from the wind directions movement.
The leeward side of a dune is shorter and called the slip face. Dunes often serve an important purpose in protecting land from storm waves.