Abstract
A one-dimensional numerical model (HEC-RAS) was calibrated to simulate morphological changes in the study reach of the Nile River downstream of Esna barrages by using the available field data of the years 2010 and 2013. The presented research utilizes the synergies between GIS and HEC-RAS in studying the morphological changes in the study area that affects directly the navigation condition and Proposes the optimum navigation path in the selected study reach based on the numerical model results data. Using data measurements, the model was calibrated and verified. It gave a reasonable agreement between the calculated and measured values for the water level and the morphological changes in the selected cross-sections and along the River's thalweg with accuracy 99.63% and 96.66% for hydraulic and sediment calibration and verification. It can be concluded from several runs of the model that the best equation for predicting morphological changes within the study area is the Ackers-White equation. Finally, the results indicate that the HEC-RAS model presents a satisfying performance for sediment transport.
Highlights
INTRODUCTION The NileRiver is the main supply of freshwater in Egypt, used in many fields such as transportation and tourism
28 different combinations should be examined. Each of these sediment transport equations was compared with the natural conditions, and the equations that had most overlapping with the natural conditions of the area were chosen as the best depositional equation. it was noticed that the Ackers-White equation and Ruby fall velocity method produced better results
4.1 Calibration and Verification Results A scatter diagram shown in Fig. 9 was established depending on the water levels along the study area for different discharges, to statistically measure the ability of the hydraulic model as a prediction tool
Summary
Data needed to simulate the study area and calibrate the model include the following: 2.1 Available Field Bathymetric (Geometric) Data A hydrographic survey carried out in 2010 and 2013 by the Nile Research Institute (NRI) was used to simulate the study area bathymetric maps and covered about 11 km of the study reach from 168.5 km to 180 km (km from downstream Old Aswan High Dam) Fig. 1. 2.4 Model Description HEC-RAS a well-known software developed by Hydraulic Engineering Center’s – River Analysis System of U.S Army Corps of Engineers is a free advanced system to analyze open channels This model can perform Steady Flow Water Surface Profile computations, Unsteady Flow Simulation, Water Quality Analysis, and several hydraulic design features.
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