Movable-Bed Model to Evaluate Nile River Dredging

by A. F. Ahmed, Hydraulic & Sediment Research, Inst, Delta Barrage, Egypt,
M. M. Gasser, Hydraulic & Sediment Research, Inst, Delta Barrage, Egypt,



Document Type: Proceeding Paper

Part of: Hydraulic Engineering

Abstract:

About 200 km south of Cario, at Bani Mazar reach, the Nile River has widened and formed several islands. The result is three channels with shallow depths. One of the branches must be improved to insure navigation. A movable-bed model with a distorted scale representing 6-km of the river was built and tested to evaluate the most effective dredging route. The model was calibrated against field data and was in fair agreement. Then tests were carried out in two successive phases. The first phase was to examine the rate of sediment deposition in dredge cuts in the left, middle and right channels as well as to determine the filling (relaxation) time of the sedimentation process. The tests conducted with either dominant or varying discharges revealed that the left channel provided the best long-term solution for navigation. This relaxation time was then utilized during the second phase to study the impact of the regular periodic dredging on the river morphology.

Subject Headings: Dredging | Rivers and streams | Sediment | Movable bed models | Relaxation (mechanics) | Hydraulic models | Channels (waterway) | Nile River

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