Modelling the dynamic processes of channel migration

The paper details an integrated physical experimental and numerical model study undertaken to investigate the channel evolution processes. The experiments were conducted in a laboratory flume, in which channel evolution and bed level changes were observed. The numerical model was based on a joint two-dimensional hydrodynamic and sediment transport model. The numerical model prediction agreed generally well with the results of physical experiments and these two approaches were used jointly to investigate the dynamic channel shift process. A series of characteristic phenomena were reproduced including: the shallowing and widening of the initial channel, the formation and development of a regular sequence of alternate bars and pools, erosional bumps of the bank line and the evolution from a regular channel to an irregular channel with the occurrence of an abrupt shift of the main flow.