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Posts tagged Negro River

Convergence of Branco and Negro Rivers, Brazil – February 9th, 2013

1.4S 61.6W

February 9th, 2013 Category: Image of the day, Rivers

Brazil – January 23rd, 2013

This image of the Amazon Rainforest, in Brazil, also shows the confluence of the Branco River (right) and Negro River (left), near the border of the states of Amazonas and Roraima. The Rio Branco (meaning White River) is the principal affluent of the Rio Negro (meaning Black River) from the north.The Branco flows nearly south, and finds its way into the Negro through several channels and a chain of lagoons similar to those of the latter river. It is 350 miles (560 km) long.

The Rio Negro, in turn, is the largest left tributary of the Amazon and the largest blackwater river in the world. It flows into the Rio Solimões to form the Amazon River South of Manaus, Brazil. Rio Negro is navigable for 700 kilometres (430 mi) from its mouth in 1 metre of water in the dry season, but it has many sandbanks and minor difficulties. In the wet season, it floods the country far and wide, sometimes to a width of 30 kilometres (19 mi), for long distances, and for 650 kilometres (400 mi) upstream. During this time, from April until October, it is a succession of lagoons, full of long islands and intricate channels.

Rivers Running Through the Amazon Rainforest, Brazil

3.1S 60W

September 29th, 2012 Category: Deforestation, Fires, Rivers

Brazil – September 1st, 2012

Rivers winding their way through Brazil’s Amazon Rainforest appear as tan lines due to the sediments they carry. Visible in the upper part of the image is the Amazon River, the world’s largest river by waterflow. The city of Manaus can be seen near the confluence of the Negro and Solimões (Amazon) Rivers.

Visible cutting diagonally across the lower part of the image is the Madeira River, the Amazon’s biggest tributary, with a length of about 3,250 km (2,020 mi). Some haze can be seen in the lower right quadrant, mostly south of the river. This is caused by smoke from fires, one of which is visible in the full image. As the fire is located near an area of deforestation, it may have been set in order to clear land for grazing, planting crops or human habitation.

Confluence of Negro and Solimões Rivers by Manaus, Brazil

3.1S 60W

September 16th, 2010 Category: Fires, Rivers

Smoke from Fires in Bolivia - September 14th, 2010

The Negro River (dark, upper left) and Solimões River (tan) cross the upper half of this image. The two rivers meet near Manáus, the capital of the state of Amazonas in Brazil.

Their confluence is quite particular, as the rivers’ different colored waters run side by side without mixing for about 6km due to differences in temperature, speed and water density.

The lower half of the image is partially veiled by smoke blowing northward from many fires in Bolivia and Brazil that have been burning over the last month.

Rincón del Bonete Artificial Reservoir, Uruguay

32.8S 56.4W

March 2nd, 2010 Category: Lakes, Rivers

Uruguay - February 24th, 2010

Uruguay - February 24th, 2010

The Negro River can be seen here as it crossing the lush green terrain of Uruguay. It is the most important river in the country and a tributary of the Uruguay River, and has the most important hydroelectric project in the country, Rincón del Bonete.

The dam (240 feet high) forms an artificial lake, visible towards the bottom of the image. The Rincón del Bonete dam and some other smaller reservoirs in the area have optimized agricultural possibilities in their area of influence.

Vegetation Index and Deforestation Near Manáus and Santarém, Brazil – December 2nd, 2009

3.1S 60W

December 2nd, 2009 Category: Climate Change, Image of the day, Rivers

Brazil - November 19th, 2009

Brazil - November 19th, 2009

This FAPAR image shows an area of Amazon rainforest in Brazil, between Santarém in the state of Pará, where the Tapajós joins the Amazon River (right edge), and Manáus at the convergence of the Negro and Solimões (Upper Amazon) Rivers (left). FAPAR stands for Fraction of Absorbed Photosynthetically Active Radiation, which corresponds to the  area’s vegetation index.

In FAPAR images, the color spectrum over land runs from red (1.0), to green, to yellow and white (0.0), while bodies of water, such as the Amazon River running through the image center, generally appear blue.

High photosynthetic activity is present in dark red regions, such as those concentrated on the left side of the image. The photosynthetic activity decreases as one moves to the right side of the image, although green areas are also productive. Yellow to white zones, with the exception of clouds, indicate a low degree of photosynthetic activity; however, few such areas are present here.

Upon opening the full image, the distinctive herringbone pattern of some deforested areas is visible. Near the Amazon River, these areas appear as yellow lines amidst the surrounding green, while in the upper left quadrant the lines are green in contrast to the surrounding dark red.

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