INVESTIGATION OF THE CHARACTERISTICS OF FLOW OVER SPILLWAYS

Gamal M. Abdel Aal, Mohamed A. Nassar, Amany A. Habib

Abstract


To prevent severe scouring of waterway bed and failure of downstream spillway structures as a result of hydraulic jump being swept out of the basin. Experimental studies investigating the flow characteristics for different spillway were carried out. The measurements are focusing on recoding of water surface at different sections. The experimental program explores the effect of different baffle blocks composition on the spillway face. In addition, it investigates the effects of the strips walls’ relative and the end sill’s characteristics. The experiments indicate that the case of staggered blocks over sloped spillway gives the smallest flow depth ratio compared to the other baffle blocks compositions. It was found that the stepped spillway structure with end sill is more efficient than the other spillways. The derived theoretical equation for relative energy loss gives a good agreement with the experimental data. Prediction equations were developed using the multiple linear regression to model the relative energy loss through the spillway structures. An acceptable agreement was obtained between the predicted and the measured values. A model of the relative energy loss is built using Genetic Programming (GP). Many trails were done to reach the optimum model. It was found that the GP model results are more accurate than that obtained by the regression technique. Finally, the conclusions of this study can be recommended in the design procedure and practical applications.

Refbacks

  • There are currently no refbacks.