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Posts tagged Blue Nile River

Dust Blowing Across Red Sea and Over Ethiopia

12.1N 37.3E

May 31st, 2012 Category: Dust Storms, Lakes

Red Sea - May 31st, 2012

Dust blows from the Arabian Peninsula, across the Red Sea, and over Eritrea, Djibouti and Ethiopia. A ridge of mountains in Ethiopia seems to keep the dust from blowing further westward, over Lake Tana (the green body of water near the image center). The lake is the source of the Blue Nile, located in the Amhara Region in the north-western Ethiopian highlands. The country’s largest lake, it is approximately 84 kilometers long and 66 kilometers wide, with a maximum depth of 15 meters, and an elevation of 1,840 meters.

White Nile River Flowing Past the Gezira Scheme, Sudan – April 19th, 2010

14.5N 33.1E

April 19th, 2010 Category: Image of the day, Rivers

Sudan - March 5th, 2010

Sudan - March 5th, 2010

Sun glint causes the White Nile River to appear truly white as it flows past the fields of the Gezira Scheme in Sudan. The Blue Nile borders this agricultural area to the east. The two rivers converge at Khartoum, near the top of the image.

The Gezira Scheme is one of the largest irrigation projects in the world, now covering about now covers 3,400 miles² (8,800 km²) in the Sudanese state of Al Jazirah. It is composed of thousands of kilometers of canals that distribute water from the Blue Nile to farms between the two rivers.

The Gezira (which means “island”) is particularly suited to irrigation because the soil slopes away from the Blue Nile and water therefore naturally runs through the irrigation canals by gravity . The soil has a high clay content which keeps down losses from seepage. The main crop grown in this region is still cotton.

Roseires Reservoir on the Blue Nile in Sudan

11.7N 34.3E

January 15th, 2010 Category: Lakes, Rivers

Sudan - December 16th, 2009

Sudan - December 16th, 2009

The Roseires Dam was built in 1966 on the Blue Nile River in Sudan, creating the Roseires Reservoir visible here towards the bottom. The dam has a nominal volume of 36.3 km3. Much of the water impounded at Roseires is used to expand and intensify agriculture on the Gezira Scheme.

Raising the crest of Roseires Dam is still on the agenda, especially because low flows on the Blue Nile have cut cropping intensities on the Gezira about 15%. Instead of 1,500,000 irrigated acres, the total irrigated area is closer to 1.2 million, while the cotton crop covers 385,000, not 500,000. As the storage capacity at Roseires declines, these figures may be expected to fall further.

Dek Island in Lake Tana, Ethiopia

11.9N 37.2E

December 26th, 2009 Category: Lakes

Ethiopia - December 16th, 2009

Ethiopia - December 16th, 2009

Partially visible on the right side of this image is Lake Tana, located in the highlands of Ethiopia.  The lake is the largest in the country and the source of the Blue Nile River. Here, its waters appear tan and green due to sediments and algal growth.

Visible amidst these colored waters is Dek Island. At approximately 16 square kilometers in size, it is the biggest island in Lake Tana. Administratively included in the Achefer woreda of the Mirab Gojjam Zone, the island has a total population of approximately 17,000 people.