File:Guineabissau oli 2018137 (cdom) lrg.jpg
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Summary
[edit]DescriptionGuineabissau oli 2018137 (cdom) lrg.jpg |
English: Estuaries near the coast of Guinea–Bissau branch out like a network of roots from a plant. With their long tendrils, the rivers meander through the country’s lowland plains to join the Atlantic Ocean. On the way, they carry water, nutrients, but also sediments out from the land.
The map shows a more detailed look at how colored dissolved organic matter (CDOM) discolors the water. Organic matter—such as leaves, roots, or bark—contain pigments and chemicals that can color the water when they dissolve. Depending on the amount of dissolved particles, the water in natural–color imagery can appear blue, green, yellow, or even brown as the CDOM concentration increases. In this data visualization, the amount of CDOM is represented in yellows, greens, and blues (with blue indicating clearer water). Note the difference in water clarity as the streams flow from inland towards the ocean. These estuaries play an important role in agriculture. This small west African country is mostly made up of flat terrain that only stands 20 to 30 meters (65 to 98 feet) above sea level. The coastal valleys flood often, especially during the rainiest part of the year (summer), and can have damaging effects on infrastructure, agriculture, and public health. But at non–devastating levels, the rains make the valleys good locations for farming, especially rice cultivation. Much of the agricultural land is created by destroying mangroves, which acts a natural barrier between the land and the water. For instance, a lot of rice production occurs along the Rio Geba, which is surrounded by broad valleys and a low, rolling plain carved out of woodlands. As a result, coastal areas have been eroding, which is expected to worsen with rising sea levels. A few projects are focused on restoring mangrove populations, and researchers have been seeing regrowth.Deutsch: Die Ästuare an der Küste von Guinea-Bissau verzweigen sich wie ein Netzwerk von Wurzeln von einer Pflanze. Mit seinen langen Armen branch mäandrieren die Flüsse durch das Tiefland des Landes auf dem Weg zu ihren Mündungen in den Atlantischen Ozean. Auf ihrem Weg transportieren sie Wasser, Nährstoffe und Sedimente vom Land auf das Meer hinaus.
Die Karte ermöglicht einen genaueren Blick darauf, wie gefärbter organischer Wasserinhaltsstoffe (CDOM) das Wasser verfärben. Organische Substanzen – solche wie etwa Blätter, Wurzeln oder Rinde — enthalten Pigmente und Chemikalien, ddie das Wasser verfärben können, wenn sie sich auflösen. Abhängig von der Menge der aufgelösten Partikel kann das Wasser in Echtfarbenaufnahmen blau, grün, gelb und sogar braun erscheinen, wenn die Konzentration der Schwebestoffe zunimmt. In dieser Datenvisualisierung wird die Konzentration der Schwebestoffe verdeutlicht in Gelb-, Grün- und Blautönen (wobei blaue Farbe klareres Wasser verdeutlicht). Man bemerke die Unterschiede der Klarheit des Wassers auf dem Weg vom Binnenland zum Ozean. Diese Ästuare spielen eine wichtige Rolle in der Landwirtschaft. Dieser kleine westafrikanische Staat besteht weitgehend aus flachem Land, das sich nur 20 bis 30 Meter hoch über den Meeresspiegel erhebt. Die Küstengebiete werden häufig überflutet, vor allem während der regenreichsten Zeiten des Jahres im Sommer, mit schädigenden Auswirkugen auf die Infrastruktur, die Landwirtschaft und die öffentliche Gesundheit. Ansonsten machen die Niederschläge die Täler zu gut geeigneten Stellen für die Landwirtschaft, insbesondere den Reisanbau. Ein großer Teil der landwirtschaftlichen Anbauflächen entsteht durch die Zerstörung von Mangroven, die eine natürliche Barriere zwischen Land und Wasser bildet. So liegt ein Großteil der Reisanbauflächen Guinea-Bissaus entlang des Rio Geba, der von flachen Tälern und einer niederen, welligen Ebene umgeben ist, die aus Waldland herausgeschnitten wurde. Als Ergebnis davonsind die Küsten erodiert, und der steigende Meeresspiegel wird die Situation verschlimmern. Einige wenige Projekte konzentrieren sich auf die Wiederherstellung der Mangroven, sodaß die Wissenschaftler teilweise Neuwachstum beobachtet haben. |
Date | |
Source | https://earthobservatory.nasa.gov/images/92266/the-meandering-estuaries-of-guineabissau |
Author | NASA Earth Observatory images by Joshua Stevens, using Landsat data from the U.S. Geological Survey. Story by Kasha Patel. |
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References & Resources
[edit]- Andrieu, J. (2018) Land cover changes on the West–African coastline from the Saloum Delta (Senegal) to Rio Geba (Guinea–Bissau) between 1979 and 2015. European Journal of Remote Sensing, 51 (1), 314-325.
- European Space Agency (2014, October 1). Guinea–Bissau and the Bissagos Islands. Accessed June 11, 2018.
- NASA Earth Observatory (2016, October 25). Minnesota: Land of the Many–Colored Lakes. Accessed June 11, 2018.
- United Nations Educational, Scientific and Cultural Organization UNESCO (2012, January 30). Coastal erosion major threat to West Africa. Accessed June 11, 2018.
- U.S. Geological Survey The Republic of Guinea–Bissau. Accessed June 11, 2018.
- Wetlands.org (2017, November 8). Restoring mangroves on abandoned rice fields in Guinea–Bissau. Accessed June 13, 2018.
Licensing
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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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current | 22:11, 23 December 2019 | 5,130 × 4,203 (2.23 MB) | Matthiasb (talk | contribs) | {{Information |description ={{en|1=Estuaries near the coast of Guinea–Bissau branch out like a network of roots from a plant. With their long tendrils, the rivers meander through the country’s lowland plains to join the Atlantic Ocean. On the way, they carry water, nutrients, but also sediments out from the land. The map shows a more detailed look at how [https://en.wikipedia.org/wiki/Colored_dissolved_organic_matter colored dissolved organic matter] (CDOM) discolors the water. Organic mat... |
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File usage on Commons
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- User:Jcornelius/Guinea-Bissau/2019 December 21-31
- Commons:WikiProject Aviation/recent uploads/2019 December 23
- File:Guineabissau oli 2018137.jpg
- File:Guineabissau oli 2018137 (cdom).jpg
- File:Guineabissau oli 2018137 lrg.jpg
- File:Guineabissau oli 2018137 lrg (cropped to Caravela and Carache).jpg
- File:Guineabissau oli 2018137 lrg (cropped to Jeta).jpg
- File:Guineabissau oli 2018137 lrg (cropped to Lisboa Island).jpg
- File:Guineabissau oli 2018137 lrg (cropped to Orango, Canogo, Meneque and Orangozinho).jpg
- File:Guineabissau oli 2018137 lrg (cropped to Pecixe Island).jpg
- File:Guineabissau oli 2018137 lrg (cropped to Ponta, Maio, Meio and Formosa).jpg
- File:Guineabissau oli 2018137 lrg (cropped to Roxa).jpg
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Horizontal resolution | 72 dpi |
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Software used | Adobe Photoshop CC 2017 (Macintosh) |
File change date and time | 13:33, 8 June 2018 |
Color space | sRGB |
Date and time of digitizing | 07:56, 8 June 2018 |
Date metadata was last modified | 09:33, 8 June 2018 |
Unique ID of original document | xmp.did:05bb983f-fc45-4568-88cc-681d4cf6a29d |