File:Thick Sediment in Madagascar’s Onibe River - NASA Earth Observatory.jpg
Thick_Sediment_in_Madagascar’s_Onibe_River_-_NASA_Earth_Observatory.jpg (720 × 480 pixels, file size: 159 KB, MIME type: image/jpeg)
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Afrikaans: Om die volle resolusie en ander lêers af te laai, gaan na: earthobservatory.nasa.gov/IOTD/view.php?id=77213&src=...
In Februarie 2012 het tropiese sikloon Giovanna oor die ooste van Madagaskar inbeweeg, met winde van 125 knope (230 km per uur) en hewige reën van meer as 250 mm (10 duim) langs die kus. Op 20 Februarie het Integrated Regional Information Networks (IRIN) berig dat minstens 23 mense gesterf het en duisende huise in Madagaskar beskadig of vernietig is. Die Gevorderde Landafbeelder (GLA) op NASA se Aardobservasie-1-satelliet het hierdie natuurlike-kleurbeeld van die sediment-verstikte Onibe-rivier op 19 Februarie 2012 vasgevang. Die rivier lyk modderbruin regdeur hierdie landskap, en lewer 'n dik sedimentpluim in die Indiese Oseaan. Die Oniberivier ontspring in die hoogland van Madagaskar en mond net noord van die kusdorpie Mahavelona (ook bekend as Foulpointe) in die see uit. Die rivier lê langs die spoor wat Giovanna gevolg het toe dit aan land gegaan het. Giovanna se hewige neerslag het derhalwe swaar afloop in die Oniberivier veroorsaak. In die ooste van Madagaskar is riviere weens die landskap se skerp helling tipies kort en vinnigvloeiend. Madagaskar se hoogste berg is byvoorbeeld 2 876 m (9 436 voet) bo seespieël, maar lê slegs 120 km (75 myl) van die kus af. Die steil hellings lei tot aansienlike erosie, maar selfs in vergelyking met die eiland se gewone aflooptempo, het die Onibe 'n swaar vrag modder en puin in die nasleep van Giovanna gedra. ’n GLA-beeld van dieselfde gebied op 6 Februarie het feitlik geen sedimentpluim by die riviermonding getoon nie. Siklone is een van die mees algemene natuurlike gevare vir Madagaskar. Nadat dit middel Februarie aan wal gekom het, het tropiese sikloon Giovanna weswaarts oor die eiland getrek, suidwaarts deur die Mosambiekkanaal gereis en toe ooswaarts na Madagaskar se suidkus geswenk. Hierdie NASA-Aardobservatoriumbeeld is deur Jesse Allen en Robert Simmon geskep, met behulp van AO-1 se Gevorderde Landafbeelderdata, verskaf met vergunning van NASA se AO-1-span. Onderskrif deur Michon Scott. Die Aardsterrewag se missie is om die beelde, stories en ontdekkings oor klimaat en die omgewing wat uit NASA-navorsing voortspruit, insluitend sy satellietsendings, navorsing in die veld en klimaatmodelle, met die publiek te deel.English: To download the full resolution and other files go to: earthobservatory.nasa.gov/IOTD/view.php?id=77213&src=...
In February 2012, Tropical Cyclone Giovanna made landfall in eastern Madagascar, packing winds of 125 knots (230 kilometers per hour) and heavy rains in excess of 250 millimeters (10 inches) along the coast. On February 20, Integrated Regional Information Networks reported that Giovanna had damaged or destroyed thousands of homes in Madagascar and killed at least 23 people. The Advanced Land Imager (ALI) on NASA’s Earth Observing-1 (EO-1) satellite captured this natural-color image of the sediment-choked Onibe River on February 19, 2012. The river appears muddy brown throughout this landscape, and delivers a thick plume of sediment to the Indian Ocean. The Onibe River arises in the highlands of Madagascar’s interior and empties into the ocean just north of the coastal town of Mahavelona (also known as Foulpointe). The river lies along the track Giovanna followed when it came ashore. Giovanna’s heavy rains spurred equally heavy runoff into the Onibe River. In eastern Madagascar, rivers are typically short and fast-moving, thanks to the area’s stark relief. Madagascar’s highest mountain, for example, is 2,876 meters (9,436 feet) above sea level yet lies just 120 kilometers (75 miles) from the coast. The steep slopes lead to significant erosion, but even compared to the island’s usual runoff rates, the Onibe carried a heavy load of mud and debris in the wake of Giovanna. An ALI image of the same area on February 6 showed virtually no sediment plume at the mouth of the river. Cyclones rank among the most frequent natural hazards for Madagascar. After coming ashore in mid-February, Tropical Cyclone Giovanna blew westward over the island, traveled southward through the Mozambique Channel, then curved back to the east, skirting Madagascar’s southern shore. NASA Earth Observatory image created by Jesse Allen and Robert Simmon, using EO-1 ALI data provided courtesy of the NASA EO-1 team. Caption by Michon Scott. The Earth Observatory's mission is to share with the public the images, stories, and discoveries about climate and the environment that emerge from NASA research, including its satellite missions, in-the-field research, and climate models. Like us on Facebook Follow us on Twitter Add us to your circles on Google+ |
| Date | |
| Source | Thick Sediment in Madagascar’s Onibe River |
| Author | NASA's Earth Observatory |
| Camera location |  | View this and other nearby images on: OpenStreetMap |  |
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This image was originally posted to Flickr by NASA Earth Observatory at https://www.flickr.com/photos/68824346@N02/6920797731. It was reviewed on 2 July 2012 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 17:09, 2 July 2012 | | 720 × 480 (159 KB) | Dzlinker | == {{int:filedesc}} == {{Information |Description=To download the full resolution and other files go to: [http://earthobservatory.nasa.gov/IOTD/view.php?id=77213&src=flickr earthobservatory.nasa.gov/IOTD/view.php?id=77213&src=...] In February 2012, Tr... |
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