03 Jun '12, 10pm

Linear Dunes, Great Sand Sea, Egypt: Winds shape the sands that were left behind by an ancient river.

In southwestern Egypt, deep in the Sahara Desert, the wind dominates the shape of the landscape, as it has done for the past several thousand years. Winds blowing from the north have fashioned sands into large dunes, aligned parallel with these winds. The so-called linear dunes—shown here in the Great Sand Sea of southwest Egypt—are easily spotted from space, and local maps show that they rise 20 to 30 meters above the surrounding plains. The distance between dunes is interestingly regular, at 1.5 to 2.5 kilometers, suggesting some equilibrium exists between the wind strength and the sand supply. It is possible that the linear dunes are a reflection of earlier times, when winds were stronger or sand more plentiful. The dark rock outcrops at image lower left stand above the surface by as much as 150 meters. North winds have been deflected around this high zone, and smaller ...

Full article: http://earthobservatory.nasa.gov/IOTD/view.php?id=78151&s...

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Linear Dunes, Great Sand Sea, Egypt: Winds shap...

earthobservatory.nasa.gov 03 Jun '12, 10pm

In southwestern Egypt, deep in the Sahara Desert, the wind dominates the shape of the landscape, as it has done for the pa...

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