Simulation of Grain Sorting Using the Characteristic Dissipation Galerkin Morphodynamic ( CDG-Morpho ) Model
Date Issued
2012
Date
2012
Author(s)
Chen, Yu-Chen
Abstract
The knowledge of river morphology is fundamental and useful information for engineering and habitat restoration purposes. Many interesting phenomena such as armoring and downstream fining significantly affect the quality of riverine habitats. Therefore, the development of meso-scale bedforms and the change in their sediment composition have become important topics of study. However, the complex interactions between flood flow, nonuniform particles and sediment transport make these problems difficult to tackle. In this study, we develop a 2D (two-dimensional) many-fraction FE (finite element) morphodynamic model which is capable of dealing with mixed-size sediment transport problems. We also present a new type of vertical sorting scheme, the virtual mass method, to investigate the common phenomenon such as patch dynamics that could occurs in most natural rivers. The proposed model adopts the characteristic dissipative Galerkin (CDG) scheme in the wetting and drying module and bed evolution module such that the convection dominated bar evolution can be computed without numerical instabilities.
Subjects
morphodynamic model
characteristic dissipative Galerkin
mixed-size sediment
sediment sorting
patch dynamics
Type
thesis
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