Experimental Study to Evaluate the Hydraulic Performance of Bastora Dam Stepped Spillway

Abstract

This study aims to evaluate the performance of proposed design for Bastora dam stepped spillway project. Experiments are conducted on a physical model, which is constructed at the laboratory of hydraulic engineering/ college of engineering/ Salahaddin University, Erbil-Iraq using an appropriate scale to avoid potential effects governing the model. The evaluation includes determining the flow regime passing the structure, length to and flow depth at the inception point, the efficiency of the structure to dissipate the energy at the toe, the height of side wall required for both the spillway chute and stilling basin at the downstream of the spillway and discharge coefficient. The results presented in the design report are compared with those measured/determined in this study and the design formulae of stepped spillway available in the literature. Although the comparisons show few discrepancies between the results, especially in terms of the energy dissipation rate and chute side wall dimension, the design report can be said acceptable and reliable.

Validation of the Computational ANSYS -CFX code for Free Surface Flow: Skimming Flow over Non-Uniform Step Size Stepped Spillways

“…Numerous attempts have been done to upgrade the designing of stepped cascades by choosing various step formations and arrangements, mainly; very rough and end sill (Andre, 2004), Inclined to upward steps (Chinnarasri and Wongwises, 2004) configuration of vanes by (Gonzalez, 2005) and non-uniformity step sizes (Felder, 2013). However, several experimental works have been done to realize the flow properties over stepped cascades, namely; (Chanson et al, 2002, Boes and Hager, 2003, Gonzalez and Chanson, 2005, Kavianpour and Masoumi, 2008, HUSAIN and AHMED, 2017. While, numerous of numerical models have been improved and adjusted to determine the flow properties of flow conditions over stepped cascades.…”