File:Barchan Dunes and Lagoons, Southern Brazil.jpg

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Barchan_Dunes_and_Lagoons,_Southern_Brazil.jpg (720 × 480 pixels, file size: 479 KB, MIME type: image/jpeg)

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Afrikaans: ’n Ruimtevaarder aan boord van die Internasionale Ruimtestasie het hierdie foto van Lagoa dos Barros en halfmaanvormige barchan-duine aan die Atlantiese kuslyn van suidelike Brasilië geneem. Lagoa dos Barros is ongeveer 4,5 kilometer (2,8 myl) lank. Die strandmere langs die Brasiliaanse kus het sowat 400 000 jaar gelede gevorm tydens die sikliese styging en daling van seevlak – wat naamlik by geoloë ​​as die transgressie-regressie-siklus bekend staan. Die vorming van Lagos dos Barros is vergelykbaar met die prosesse wat vir Lagoa Mirim, 340 kilometer na die suid-suidweste, verantwoordelik is.

Sterk winde wat uit die Wes-Atlantiese Oseaan inwaai, veroorsaak die kenmerkende halfmaanvorms van die kuslangse duine. Veelvuldige duine het oorvleuel en saamgesmelt om duinvelde te vorm, met prominente voorbeelde sigbaar na die noordooste en suidwes van die meer. Die punte van barchan-duine wys windaf, wat die heersende windrigting aandui. Hierdie brose formasies dien as versperrings wat wind en golwe verhoed om die binneland binne te dring, sodat die effek van storms gedemp en kuserosie tot 'n minimum beperk word.

Ruimtevaarderfoto ISS052-E-14188 is op 9 Julie 2017 met 'n Nikon D4 digitale kamera verkry wat 'n 1150 millimeter lens gebruik, en word deur die IRS-bemanning se Aardwaarnemingsgerief en die Aardwetenskap en Afstandwaarnemingseenheid van die Johnson-ruimtesentrum verskaf. Die beeld is deur 'n lid van die Ekspedisie 52-span geneem. Die prent is geknip, die kontras verhoog, en lensartefakte is verwyder.
English: An astronaut aboard the International Space Station captured this photograph of Lagoa dos Barros and crescent-shaped barchan dunes on the Atlantic coastline of southern Brazil. Lagoa dos Barros is approximately 4.5 kilometers (2.8 mile) long. The lagoons along the Brazilian coast formed around 400,000 years ago as part of the cyclic rise and fall of sea level—known to geologists as the transgression-regression cycle. The formation of Lagos dos Barros is similar to what occurred alongside Lagoa Mirim, 340 kilometers to the south-southwest.

Strong winds blowing in from the Western Atlantic sculpt the sand along the coast into distinctive crescent shapes. Multiple dunes have overlapped and coalesced to form dune fields, with prominent examples visible to the northeast and southwest of the lake. The tips of barchan dunes point downwind, indicating the prevailing wind direction. These fragile formations act as barriers keeping the wind and waves from penetrating inland, blunting the effect of storms and minimizing coastal erosion.

Astronaut photograph ISS052-E-14188 was acquired on July 9, 2017, with a Nikon D4 digital camera using an 1150 millimeter lens, and is provided by the ISS Crew Earth Observations Facility and the Earth Science and Remote Sensing Unit, Johnson Space Center. The image was taken by a member of the Expedition 52 crew. The image has been cropped and enhanced to improve contrast, and lens artifacts have been removed.
Date Taken on 9 July 2017
Source https://earthobservatory.nasa.gov/IOTD/view.php?id=91119&src=eoa-iotd
Author NASA Astronaut photograph from ISS
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This image or video was catalogued by Johnson Space Center of the United States National Aeronautics and Space Administration (NASA) under Photo ID: ISS052-E-14188.

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Public domain This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.)
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current15:51, 18 October 2017Thumbnail for version as of 15:51, 18 October 2017720 × 480 (479 KB)Tillman (talk | contribs){{Information |Description ={{en|1=An astronaut aboard the International Space Station captured this photograph of Lagoa dos Barros and crescent-shaped barchan dunes on the Atlantic coastline of southern Brazil. Lagoa dos Barros is approximately 4.5...

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