A Study of Sediment Transport in Euphrates River Upstream AL- Ramadi Barrage

Abstract

Sediment transport induced by flow of alluvial rivers has received increasing attention in recent years, because it has manifested effects on engineering problems. Thus, two models were developed to predict the river behaviour under given flow conditions. 9BThe first model is a two dimensional depth-averaged hydrodynamic model based on the conservation of mass and momentum equations to estimate the velocity field and water depths. The second model is a morphological model based on the dynamic equation of sediment continuity to predict the river bed variations in two dimensions. 10BThe finite element technique was applied to formulate the two models incorporating with weighted residual method. Iterative scheme with a modified Gaussian elimination was used for solving the nonlinear differential equations of hydrodynamic model, whereas the morphological model is linear and it has no need to an iterative fashion. 1BThe two-dimensional hydrodynamic model was applied to an idealized case and verified by comparison with analytical solution. The application gave a good agreement between calculated and analytical II result. Calibration and verification are achieved in study reach using observed data (stage) in selected node. 12BThe two models were coupled together and applied to Euphrates River in AL-Ramadi City. The result of coupled models revealed reasonable outcomes and the variation of the bed elevation reflected the expected tendency in bend region of river when the scour happened at the outer bank and deposition at inner bank.