Sediment Transport and Deposition in the Blue Nile At Khartoum, Flood Seasons 1967/1968 and 1969.

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Omer, Elbadri
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University of Khartoum
The transport and deposition of sediments by the Blue Nile at Khartoum during the flood seasons 1967, 1968 and 1969 were studied. Special attention was given to transportation of suspended matter as it is important in the formation and renewal of the fertile riverine land both in Egypt and the Sudan. The quantity and quality of suspended matter carried by the river showed seasonal variations which are related to hydrological conditions. Current velocity is the most important determining factor. Analysis of samples from various points across the river at Khartoum showed that annually large amounts of sediments are carried during the flood period, usually from July to October; the concentration increased from values less than 100 mg/1 in June to a maximum of about 4,000 mg/ in August. The total amounts of material transported during the 1967, 1968 and 1969 flood seasons were 64.5 , 63.1 and 69.5 million tons respectively of which mechanical analysis showed that approximately 36 per cent was sand, 25 per cent silt and 5 per cent clay. Much higher amounts of suspended material were obtained for the Blue Nile at Sennar during the 1959, 1960 and 1961 flood seasons. The decrease is interpreted as direct result of the construction of the Roseires dam in 1965.
Sediment Transport; Blue Nile; Khartoum; Flood Seasons