THREE DIMENSIONAL MODELING OF SEDIMENT TRANSPORT UPSTREAM OF AL-BETERA REGULATOR-IRAQ

Abstract

This paper represents an analytical study, simulation (flow field and sediment movements), and estimation of the sediment deposition for the Al- Betera river reach upstream of Al-Betera regulator – Maysan Governorate–Iraq. Field measurements techniques and SSIIM Model were used for these purposes. A river reaches with a length of 4250m was chosen and divided into 17 cross-sections. The Model solves the Navier – stokes equations for calculating the water velocity with a k-ε model for predication the turbulence (shear stress). The Model is a stepping stone in the field of Computational Fluid Dynamics (CFD). The sediment rating curve was established by using the historical data (1984-2014) of the suspended sediment loads and river discharge which considers as a reference for researchers who are interested in the field of sediment transport. The plan form of river morphology was classified as a straight (1.07 sinuosity) for the period 1986, 2007and 2014. In this study, a new sediment load transport rate equation by using multiple linear regression analysis was developed. The results of the evaluation showed that the new model performs better than many Researchers [Ackers(1973), Yang(1996), Van Rijn(1987), Ariffin (2004), and Jassim (2012) ]. A graphical representation of 3D velocities was obtained by simulation and by using Power-law Scheme (x-y,y-z,x-z planes). Good agreements were found between the simulated and measured values of the flow velocity and sediment concentration in 3D for the selected 3 nodes in the y-direction and for 3 depths of flow ...