Modeling of Sediment Transport Around A Water Intake In Tigris River – Baghdad Using A Numerical 2d Model

Abstract

     Understanding sedimentation behavior and its transport capacity in the Tigris River is of significant importance owing to the detrimental consequences caused by it. This study investigates the sediment amounts transported along the reach of the Tigris River in Baghdad. The CCHE2D model which is a common tool developed by the National Center for Computational Hydrological Science and Engineering (NCCHE) was applied to investigate the flow pattern and sediment amounts within 7 km reach. The model was initially calibrated and validated under steady-state conditions at the Sarai gauging station (upstream) and its performance was evaluated around the Abu Nawas water treatment plant (downstream). The result shows that the water surface level and velocity in the Sarai Baghdad gauging station and Abu Nawas raw water station cross-sections are different due to different considerations which are discharged, bank and bed soil types, channel velocity, and section shape. Moreover, the sediment concentrations ranged between 0.240 - 0.350 kg/m³ at the cross-section of the Sarai Baghdad gauging station while the cross-section of Abu Nawas raw water station ranged between (0.040-0.090) kg/m³. Additionally, the study investigated the average suspended sediment concentration at the river reach which ranged from 150 to 300 kg/m³. Finally, the study demonstrated CCHE2D's capacity to simulate river flow and sediment movement.