TWO DIMENSIONAL MORPHOLOGICAL DYNAMIC MODELING OF A COMPLEX RIVER SYSTEM

The interactions between hydrological and geomorphological processes in the river especially for sediment transport are fundamental to the development of a fluvial landscape. Because of the geomorphological characteristics of a landscape, the processes of weathering erosion and deposition are dependent on the flow of water through a complex system, and these processes very much depend on the form of a landscape including soil and vegetation development. These control the divergence and convergence of flow paths. The purpose of this study was to model the river dynamic, to quantity or characterize flow dynamic, and to determine the hydraulic condition under different flow-conditions. A depth-averaged two-dimensional hydrodynamic morphological and sediment transport model was constructed based on the RIVER2D model. This is a numerical finite element model, which is intended for simulating river flow hydraulics, sediment transport, and morphological changes of a river over time in the 2-dimensional horizontal planes. The model assumes that the vertical velocity is uniform and pressure distributions are hydrostatic. The results from the simulation provide the basis for understanding the hydrodynamic and geomorphic conditions in river ecosystems based on various scenarios under altered hydraulic parameters to characterize and predict dynamic processes. Thus, this model can be used to provide solutions to existing problems and to simulate future issues before they occur. This model can be a valuable tool for solving complex issues in fluvial geomorphology.