Wikipedija

Slika:ISS-31 Linear dunes in the Great Sand Sea in southwest Egypt.jpg

Izvorna datoteka ‎(4.288 × 2.848 točk, velikost datoteke: 1,11 MB, MIME-vrsta: image/jpeg)

Logotip Zbirke
Logotip Zbirke
Datoteka je shranjena v Wikimedijini zbirki prostega slikovnega, zvočnega ter videogradiva.
Spodaj prikazane informacije so s tamkajšnje opisne strani.

Povzetek

Opis
English: Linear dunes in the Great Sand Sea in southwest Egypt are featured in this image photographed by an Expedition 31 crew member on the International Space Station.
  • In southwestern Egypt, deep in the Sahara Desert, the action of wind dominates landscapes today much 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 - are easily seen from space and local maps show that they rise 20--30 meters above the surrounding flat plains.
  • The distance between individual linear dunes is interestingly regular, at 1.5--2.5 kilometers, suggesting some equilibrium exists between the formative wind strength and the sand supply. It is possible that linear dunes may relate to earlier times when winds were stronger than they are today, or sand more plentiful. The dark patch of rock outcrop at upper right sticks up above the surface on which the dunes lie by as much as 150 meters.
  • The north winds have been deflected around this high zone, and smaller secondary linear dunes can be seen along the right side of the image, aligned with local winds that become ever more northeasterly with nearness to the outcrops. A dune-free zone on the protected downwind (south-southeast) side of the outcrop gives a sense of the sand movement (generally from the bottom of the image towards the top).
  • At first glance, the large linear dunes appear to be the major landform in the image; however a complex pattern of even smaller dunes can be seen perched on top of the largest dunes (inset). The sand that comprises many dune fields usually, according to scientists, derives from some larger river not very distant upwind, supplied from the dry river bed (exposed to the wind during dry seasons of low river flow, or regional change to a more arid climate).
  • Inland dune fields thus lie downwind of the source river. A large, unnamed river once flowed to the Mediterranean Sea situated west of the dunes shown in this picture, dumping its sand load 300 kilometers northwest of the area shown. It is likely that this river, the evidence of which is now almost completely obliterated, was the source of the sand in the linear dunes, the scientists say.
Datum
Vir http://spaceflight.nasa.gov/gallery/images/station/crew-31/html/iss031e030783.html
Avtor NASA
To sliko ali ta video je katalogiziral Johnson Space Center Nacionalne uprave za aeronavtiko in vesolje (NASA) Združenih držav Amerike pod oznako fotografije: ISS031-E-030783.

Ta predloga ne označuje avtorskopravnega stanja dela. Ob njej mora stati tudi običajna oznaka avtorskopravnega stanja gradiva. Glejte Commons:Navedba licence.
Drugi jeziki:

العربية ∙ беларуская (тарашкевіца) ∙ български ∙ català ∙ čeština ∙ dansk ∙ Deutsch ∙ English ∙ español ∙ فارسی ∙ français ∙ galego ∙ magyar ∙ հայերեն ∙ Bahasa Indonesia ∙ italiano ∙ 日本語 ∙ македонски ∙ മലയാളം ∙ Nederlands ∙ polski ∙ português ∙ русский ∙ sicilianu ∙ slovenščina ∙ Türkçe ∙ українська ∙ 简体中文 ∙ 繁體中文 ∙ +/−

Licenca

Public domain
This file is in the public domain in the United States because it was created by the Image Science & Analysis Laboratory, of the NASA Johnson Space Center. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (NASA media use guidelines or Conditions of Use of Astronaut Photographs). Photo source: ISS031-E-30783.

العربيَّة | Deutsch | English | español | français | italiano | kurdî | македонски | മലയാളം | português | sicilianu | +/−

Napisi

Dodajte enovrstični opis, kaj ta datoteka predstavlja

Predmeti, prikazani v tej datoteki

motiv

nastanek

11. maj 2012

Zgodovina datoteke

Kliknite datum in čas za ogled datoteke, ki je bila takrat naložena.

Datum in časSličicaVelikostUporabnikKomentar
trenutno01:36, 6. junij 2012Sličica za različico z datumom 01:36, 6. junij 20124.288 × 2.848 (1,11 MB)Ras67{{Information |Description={{en|1=Linear dunes in the Great Sand Sea in southwest Egypt are featured in this image photographed by an Expedition 31 crew member on the International Space Station. * In southwestern Egypt, deep in the Sahara Desert, the ...

Datoteka je del naslednje 1 strani slovenske Wikipedije (strani drugih projektov niso navedene):

Globalna uporaba datoteke

To datoteko uporabljajo tudi naslednji vikiji:

  • Uporaba na en.wikipedia.org
  • Uporaba na es.wikipedia.org
  • Uporaba na eu.wikipedia.org
  • Uporaba na kw.wikipedia.org

Metapodatki

Datoteka vsebuje še druge podatke, ki jih je verjetno dodal za njeno ustvaritev oziroma digitalizacijo uporabljeni fotografski aparat ali optični bralnik. Če je bila datoteka pozneje spremenjena, podatki sprememb morda ne izražajo popolnoma.

Pridobljeno iz »https://sl.wikipedia.org/wiki/Slika:ISS-31_Linear_dunes_in_the_Great_Sand_Sea_in_southwest_Egypt.jpg«