MODELING OF INITIAL RECRUITMENT OF RIPARIAN VEGETATION ONTO BARE BAR IN SAND BED RIVER

This study aims to predict the potential initial recruitment zone and its coverage rate of riparian vegetation at the recruitment zone. An initial recruitment model was proposed with the considerations of inundation frequency, sediment transport and spring flood. The parameter used in the simulation is calibrated by the UAV monitoring and aerial photograph analysis results at the target river. Then the model was validated by comparing with the field survey results. The simulation results showed that the initial recruitment zone locates along the shoreline with the line shape, and the coverage rate of vegetation at the recruitment zone presents the decreasing trend from the internal boundary to the external boundary. The comparison of simulation and field survey results showed that the initial recruitment model can predict the initial recruitment zone well and approximately express the coverage rate of vegetation. This indicated that hydrological variables are significant for initial recruitment of riparian vegetation.