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Dunes are not stationary because they move with the wind.
Sand dunes move down wind. A simple example: if the prevailing wind is from the west, the dunes will mainly move towards the east.
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wind
Yes. Dunce move in the direction of the current or wind.
wind and storms cause the dunes to move by moving around the individual sand grains when the dunes get too large the 15 mph winds will cause them to collapse and thus it has moved.
Short
The wind causes movement
No way to tell, sand dunes move every time a wind springs up.
In the direction of the prevailing wind. In geology, unidirectional cross-bedding can be preserved in sandstones, showing the procession of dunes over time.
they dont have periods.
Sand dunes in every desert are in almost constant movement. They are simply hills of sand and the wind changes them easily and often.