Author(s): M. Eizel-Din; M. D. Bui; K. Kramer; P. Rutschmann; A. S. Elzein
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Keywords: No Keywords
Abstract: A 1D hydro-morphological numerical model using the computer package MIKE 11has been set up to simulate the bed changes in the 236.1 km long Nile River stretch from Atbara town (324.3 km downstream of Khartoum) to El-Koro town (km 560.4). The hydraulic model has been calibrated by using available rating curves and measured water levels at 4 different locations, namely: Berber (km 362.7), El-Shereik Ferry (km 476.0), El-Shereik Old (km 478.2), and El-Koro (km 560.4). The calibrated Manning's coefficients vary with discharge and also along the river stretch. The model was then validated by applying it to a flood event in 2007 for which a good agreement between calculated and measured results was obtained. In the graded sediment transport model the bed load was considered as non-cohesive sediment and the suspended load as mostly cohesive. The calibration of the sediment transport model was based on bathymetric measurements of river cross sections assuming that the river reach to be in a quasi-equilibrium state before construction of the dam. The numerical model was used to estimate the long-term bed changes in the river reach due to reservoir impounding and to optimize sediment flushing scenarios with respect to reservoir capacity and environmental aspects.
Year: 2009