How fast walking dunes? So far this was difficult to ascertain. You had to drive into the desert and make complicated measurements (aerial photographs, soil test measurements). Then out came
values from 5 to 100 meters per year. Depending on the location and amount of Sicheldüne.
values from 5 to 100 meters per year. Depending on the location and amount of Sicheldüne.
has now be taken for the measurement of the desert dunes satellite images to help and came to amazing speeds, "In the Bodélé Djourab-depression in Chad, which belongs to the Sahara, they identified such a new record: 200 meters per year and create more small sickle dunes back from about ten meters high, "said Pieter Vermeesch from Birkbeck College." Small dunes are generally faster than large Dunes, qarzhaltige slower than diatomaceous. Dunes migrate not only do they meet and sometimes they even eat each other. It can be described thus "Sandy Land Surge, the shifting, driven by the wind strengthens and wind direction. Similar to the water wave.
When the wind hertreibe the dunes in front of him, created the largest cloud of dust of the earth. This dust plays an important, but so far poorly understood role in the global climate.
When the wind hertreibe the dunes in front of him, created the largest cloud of dust of the earth. This dust plays an important, but so far poorly understood role in the global climate.
image source. Www.aboutpixel de / / Author: Barmon
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