Lineardünen

Lineardünen, also known as longitudinal dunes, are a type of sand dune characterized by their elongated, often sinuous shape that runs parallel to the prevailing wind direction. Unlike barchan dunes, which are crescent-shaped and point into the wind, linear dunes form in areas where winds are directional but may not be strong enough to create a constant supply of sand from all directions. They are typically found in desert environments with sparse vegetation cover.

The formation of linear dunes is believed to be a result of a complex interaction of wind patterns. While one dominant wind direction shapes the overall elongation, secondary winds or even subtle variations in the primary wind can contribute to the sinuous, ribbon-like appearance. The sand grains are transported along the crest of the dune, causing it to grow and migrate slowly over time. These dunes can vary significantly in size, from a few meters to hundreds of kilometers in length, and can be tens of meters high.

Linear dunes are commonly observed in large dune fields, such as those found in the Sahara Desert, the Namib Desert, and parts of Australia. Their distinctive morphology makes them a significant feature in desert landscapes and an important subject of study for understanding aeolian geomorphology and past climatic conditions.