الفهرس 
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Abstract
The purpose of this research is to study some of the effects of the hydraulic structures on Nile River in Egypt. Both the hydraulic structures and the Nile River are affecting each other. For this study the major Egyptian Barrages are considered. The analysis includes the local scour downstream hydraulic structures, the morphological changes for the reaches downstream hydraulic structures, and the seepage analysis under and downstream the hydraulic structures. For the local scour analysis and the morphological changes for the reaches downstream hydraulic structures, the mathematical model GSTARS 2.000, which was developed by U.S. Bureau of Reclamation (1998) was used for the analysis. The calibration results showed close relationship and the average depth drops for the scour hole for different floods were predicted for Naga Hammadi and Assiut Barrages. For the reaches downstream Esna and Naga Hammadi Barrages, the different flood water levels were predicted to evaluate the problems with navigation for low floods and the overtopped areas for high floods. For seepage analysis, a probabilistic numerical model was developed by the author to study seepage. This model takes into account the spatial variability of the conductivity coefficients in both horizontal and vertical directions. It uses both Monte Carlo and Nearest-Neighbor concepts to generate an auto-correlated set of the conductivity coefficients. This model was calibrated using actual piezometers readings under Naga Hammadi Barrage. The calibration results show close relationship between the observed and the predicted values. This model produces the distribution of the piping and the uplift factors of safety. These distributions are subjected to goodness of fit tests and Normal Distribution was suggested for these distributions. The probabilities of critical factors of safety for both piping and uplift were obtained from this analysis.