Hydraulic model tests for sediment flushing at power intakes of a Nile hydro-power project in Sudan

摘要

For a new hydropower project on the 5th Nile cataract in Sudan special sediment sluices, located below the power intakes, are designed to flush the sediment and to keep the intakes free from deposition. The optimisation and flushing abilities of the sediment sluices were investigated in a 1:30 Froude model in the Laboratory of Hy-draulic and Water Resources Engineering of the Technische Universitat Munchen in Obernach, Germany. The hydraulic model tests were carried out with two different model materials representing the prototype bedload. The investigations proved the functionality and the desired flushing effect of the sediment sluices even for the more resistant model material and without additional guiding structures upstream of the intakes. Both model materials resulted in similar equilibrium scour holes in front of the intakes, differing only in the times necessary to achieve equilibrium.