What are the white stripes on the satellite images of Gansu and Dunhuang?

The white stripes on satellite images of Gansu and Dunhuang are "alluvial fans".

These lines can be seen on satellite images. They are actually river sediments distributed in the southeast of Dunhuang, which are formed by the water flowing from the nearby mountains on the Dunhuang Plain. Alluvial fan landform is widely distributed in Dunhuang area and is one of the main landforms in Dunhuang.

In addition, Dunhuang also has a unique geomorphological feature, which is the famous Mingsha Mountain. Mingsha Mountain, located 40 kilometers south of Dunhuang City, is a sand dune about 200 meters high. Due to the special geographical environment and climatic conditions, the sand here will roar when it is blown by the wind, hence the name.