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Flow and sediment analysis is required for organizing or managing research projects in rivers. Due to fully three-dimensional nature of the flow in the river bend, streams and sediment are difficult to analyze. Development of three-dimensional numerical models and advanced computing power of computers has led to the increasing use of numerical modeling studies of hydrodynamic and sediment flow. But accuracy and validity of numerical results of flow especially in conjunction with the sediment at complex Geometry has not been determined yet. In the present study, in order to simulate the hydrodynamic of flow and sediment in the bend and lateral intake of bend, three-dimensional numerical model SSIIM2 has been used. Simulation results show that the model's prediction accuracy of hydrodynamic flow and the secondary flow in the bend, hydrodynamic flow in the lateral intake of the bend, and water surface in the lateral intake of the bend is acceptable. Model error in predicting the topography of the bed in the bend with lateral intake is relatively high. The error of the numerical model is due to using two-equation turbulence model k- ε and the sediment transport equations. Flow and sediment analysis is required for organizing or managing research projects in rivers. Due to fully three-dimensional nature of the flow in the river bend, streams and sediment are difficult to analyze. Development of three-dimensional numerical models and advanced computing power of computers has led to the increasing use of numerical modeling studies of hydrodynamic and sediment flow. But accuracy and validity of numerical results of flow especially in conjunction with the sediment at complex Geometry has not been determined yet. In the present study, in order to simulate the hydrodynamic of flow and sediment in the bend and lateral intake of bend, three-dimensional numerical model SSIIM2 has been used. Simulation results show that the model's prediction accuracy of hydrodynamic flow and the secondary flow in the bend, hydrodynamic flow in the lateral intake of the bend, and water surface in the lateral intake of the bend is acceptable. Model error in predicting the topography of the bed in the bend with lateral intake is relatively high. The error of the numerical model is due to using two-equation turbulence model k- ε and the sediment transport equations. Flow and sediment analysis is required for organizing or managing research projects in rivers. Due to fully three-dimensional nature of the flow in the river bend, streams and sediment are difficult to analyze. Development of three-dimensional numerical models and advanced computing power of computers has led to the increasing use of numerical modeling studies of hydrodynamic and sediment flow. But accuracy and validity of numerical results of flow especially in conjunction with the sediment at complex Geometry has not been determined yet.

Keywords: SSIIM2, Bend, lateral intake, scour, SSIIM2

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