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Constructive landforms
What is a Landform
Landforms created by crustal deformationLanforms created from volcanic activityFormation of landforms from sediment depositionWeathering factor of landformsLandforms created by erosionKinds of landformsFormation of a canyon landformformation of cape and formation of peninsulaFormation of coastline landformsFormation of continental shelf landformsFormation of a delta landformFormation of desert landformsFormation of glaciersHow do islands formHow do isthmus landforms formFormation of mountain landformsHow fo plains formHow do Plateaux landform formHow do sand dunes formHow do valleys form Destructive landforms
SUGGESTED LESSONS
Genetic engineering
Green energy
crude oil
Effects of overfishing
Water shortage
climate change
DeforestationThe ozone layer
Waste management
Wasting foodNatural resources for children

How is a landform created
 


What is a sand dune


A sand dune is a mound of sand usually formed in windy areas with very little or no vegetation and with lots of sand. They are created from drifting sand grains in a process called saltation. As winds blow, the sand grains bounce on the surface (windside) until they reach the top of the mound, then they fall on the slipface side.

How sand dunes form

Sand dunes have a wind side and a slipface side. They come in many small sizes and shapes. Many sand dunes in one location is called a sand field or a dune field. An even larger area of dunes is called an Erg.

Some types of dunes include the following:

Crescentic dunes: crescentic dune landform
These are the most common types, in the shape of a crescent. The gently sloping side (wind side) faces the wind and the slip-face side faces the opposite direction. They are also called barchans or transverse dunes.

Linear dunes:
linear dune landform
These are in long narrow lines and may also look wiggly. They form when the wind blows in opposite directions.

Star dunes:
These look like swirling stars and they form when the wind blows in multiple directions.
star dune landform

Dome dunes:
These may not be as striking as the others but be seen on sand beaches. They are like circular or oval mounds of sand and do not have a slip-face side. They form when the wind just piles up sand, usually around an object or vegetation as it traps the airborne sand.

Parabolic dunes:
These are like crescent dunes but this time, the wind direction is towards the slip-face side. This is so because if the wind blows off one side of a sand mound, it will create a hollow there. This is also called a blowout dune. These dunes are very mobile.


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How is a landform created