Sujet
Earth Observations taken by the Expedition 17 Crew
Légende
(31 May 2008) --- Toshka Lakes in southern Egypt are featured in this image photographed by an Expedition 17 crewmember on the International Space Station. Most of the bright yellow sand dunes in the view are re-emerging as the lake level drops, most outlined visibly by thin wet margins. Still-submerged dunes can be seen as small gray blebs offshore (left center). The summit of the biggest horn-shaped dune (top left) was an island more than 5 kilometers off shore in images from 2001. The dune pattern gives a strong sense of dune migration southwards, from top left towards lower right (horns of crescent dunes point in the direction of dune movement). Dominant northerly winds drive the dunes southward, except, of course, when they are under water.
Info+
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Date
31 mai 2008
Crédit
Photo12/Universal Images Group
Notre référence
UMG22A40_231
Licence
Droits gérés
Format disponible
17,1Mo (979,5Ko) / 17,0cm x 25,1cm / 2010 x 2968 (300dpi)