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Why do the Takla Makan Desert’s sand dunes have many different shapes?

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Map of Asia highlighting the location of the Takla Makan Desert in northwestern China, with the desert area shaded in orange. Surrounding regions, including parts of Europe, Africa, and the Pacific Ocean, are shown for geographic context. An inset in the top right corner provides a global view with the desert's location marked. — Takla Makan Desert The Takla Makan Desert is flanked by high mountain ranges: the Tien Shan to the north, the Kunlun Mountains to the south, and the Pamirs to the west.

The diverse shapes of sand dunes in the Takla Makan Desert are primarily the result of the basin's complex wind conditions.1

The desert experiences varied air currents, such as the prevailing northerly and northwesterly winds that meet near the center of the basin, creating a sophisticated circulation system. Additionally, strong northeasterly winds occur during the spring, often accompanied by intense dust storms. Because these winds blow from different directions and vary in velocity, they mold the sand into a wide array of eolian (wind-formed) topographic features.231

This complexity is further influenced by the local topography, as winds are channeled around various features, including mountain ranges and the dunes themselves, which creates secondary flow patterns that modify dune shapes. Consequently, the Takla Makan features a variety of structures, including pyramidal dunes, networks of hollow dunes, and large, complex chains where both transverse and longitudinal forms coexist.31