Abstract
Two types of numerical models are tested to predict flow and bed deformation of braided bar channel. The first model is the classical 2-dimensional quasi-steady flow model with upwind differential numerical scheme. The second model is 2-dimensional unsteady flow model with CIP numerical scheme. The results of the models are favorably compared with the moveable bed experiments. The models are tested in the very wide channel to predict the development of multi-low bar or braided bed configuration. In this case, only the second model with CIP scheme show good performance. It is found that the second model can be a powerful tool to predict the formation of braided stream in alluvial rivers.
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