3D Hydrodynamic Modelling Enhances the Design of Tendaho Dam Spillway, Ethiopia

Abstract

Hydraulic structures are often complex and in many cases their designs require attention so that the flow behavior around hydraulic structures and their influence on the environment can be predicted accurately. Currently, more efficient computational fluid dynamics (CFD) codes can solve the Navier–Stokes equations in three-dimensions and free surface computation in a significantly improved manner. CFD has evolved into a powerful tool in simulating fluid flows. In addition, CFD with its advantages of lower cost and greater flexibility can reasonably predict the mean characteristics of flows such as velocity distributions, pressure distributions, and water surface profiles of complex problems in hydraulic engineering. In Ethiopia, Tendaho Dam Spillway was constructed recently, and one flood passed over the spillway. Although the flood was below the designed capacity, there was an overflow due to superelevation at the bend. Therefore, design of complex hydraulic structures using the state-of- art of 3D hydrodynamic modelling enhances the safety of the structures. 3D hydrodynamic modelling was used to verify the safety of the spillway using designed data and the result showed that the constructed hydraulic section is not safe unless it is modified.

Comparison Between Numerical Flow3d Software and Laboratory Data, For Sediment Incipient Motion.

“…A second-order method can be used when greater accuracy is required. In both space and time, this option is second-order accurate [33]. The second order was chosen for this study .…”

Flow Discharge Prediction Study Using a CFD-Based Numerical Model and Gene Expression Programming

“…Flood control, reliable water supply, navigation, recreation, and hydroelectric power generation are the most important reasons for dam development around the world [1][2][3][4]. Spillways are hydraulic structures built on dams to convey excess flood flow beyond the dam's capacity.…”

Numerical and Physical Modeling of Ponte Liscione (Guardialfiera, Molise) Dam Spillways and Stilling Basin

“…The authors in [5][6][7][8] presented some of the first examples of numerical simulation applied to the reconstruction of flow over a spillway with a 3D Reynolds-averaged Navier-Stokes (RANS) model. The reliability of numerical models in capturing the water surface profile along dam spillways located in different parts of the world is demonstrated in a few contributions [9][10][11][12][13][14][15]. Ref.…”