Calibration of CCHE2D for Sediment Simulation of Tarbela Reservoir

The numerical model CCHE2D has been applied to simulate flow field for the Tarbela Reservoir on the Indus River, Pakistan. Initial Water Surface Level, Input and Output Hydrographs, Bed Load Adaptation Length, Porosity, Suspended Sediment Concentration, Bed Load Trasport rate, Sediment Size Classes and Manning's coefficient was identified in the model calibration using measured field data. Whereas, the literature was reviewed for the values of Schmidt number and Suspended Sediment Adaptation Length factor. The calibrated model was then validated using more filed data measured during several Reservoir surveys of Tarbela Reservoir. The results showed that predicted Bed elevations were in a good agreement with the field measurements and imply that the CCHE2D model can simulate, to an extent of satisfaction, an unsteady natural river channel flow with a complicated geometry with sharp bends and wider flood plains.