The Nile River is an Egyptian cultural symbol. The Nile provides almost all the fresh water used by 90 million Egyptian living along its banks. Over the past decades, there have been heated debates over the pros and cons of building large dams Tilt et al. (2009).The Great Ethiopian Renaissance Dam (GERD) is built on the Blue Nile River, in the western part of Ethiopia about 40 kilometres from Sudan's border. It is expected that GERD will create a reservoir with maximum net head and total height of 133 and 145 m respectively. A study of environmental impact of GERD on the Egyptian water resources and security was performed [1], they concluded that, GERD will have a potential effect on the water share of Egypt during the filling of its resevoir. The potential effect of that dam on the stability and efficiency of the Rosetta promontory, the terminal of the Nile River with the Mediterranean Sea, is investigated by using the Coastal Modeling System software. Field data of wave,wind, tide, sediment characteristics and bed morphology are used to construct and calibrate the model. The developed model scenarios contain the reduction in the water discharge to the sea in increments of 25% from 100% to 25% which corresponds to the damfilling period from 2 years to 6 years. The other scenarios allow the maximum discharge through the Nile branch continuously for two months to represent the case of the dam's destruction. CMS model has been set up and calibrated. The results show that a good agreement with the measurements can be picked up. The model was firstly run for one year with the normal case of flow discharges and hydrodynamic force as a base for comparison. Six cross sections inside the Rosetta Inlet were utilized to compare the morphology of bed profiles for the different scenarios. Seven beach profiles were also used to investigate the effect of the different scenarios on the coastal area.
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