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A STUDY OF LOCAL SCOUR AT BRIDGE PIERS OF EL-MINIA

A STUDY OF LOCAL SCOUR AT BRIDGE PIERS OF EL-MINIA,Gamal A. Sallam,Medhat Aziz

A STUDY OF LOCAL SCOUR AT BRIDGE PIERS OF EL-MINIA  
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Bridges are critical structures that require a substantial investment to construct and serve an important role in economic development. For a developing country such as Egypt, there is need to protect these assets by continuous monitoring, maintenance, proposing any required repair works and execute them with a very high quality control. El-Minia Bridge was constructed in 1987. It consists of 15 vents each of 40.00 m wide, except the navigation vent, which is 62.00 m wide. Recently, there have been some difficulties regarding navigation underneath the bridge. Since some submerged islands are formed near the navigational vent, some deposition near the navigational vent of the bridge has raised the bed level. This has resulted in an insufficient depth of water for navigation through the navigational vent. In addition, river bed has changed around bridge piers. Nile Research Institute (NRI) has conducted the analysis for this problem to avoid any damages that could occur to the bridge. Nile Research Institute research team were sent for collecting the field data for the site of El-Minia Bridge Km. 205.050 upstream of El-Roda site along the Nile River, in which pier size, sediment size and mean approach flow velocities are recorded. A mathematical model was used to study the measured scour hole values and to predict to predict the future maximum expected scour hole. That was conducted to evaluate the causes and consequences of scour holes on the bridge piers of El-Minia. In addition, some methods and tools for minimize the effect of scour holes on the bridge piers were discussed.
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