In recent years, the excessive growth of trees such as Salix species after river channel excavation has posed negative effects on flood control and the river ecosystem, creating another challenge for river management. In this study, we investigated how Salix chaenomeloides may invade and take root in the Ibi River by conducting genetic and flow regime analysis, based on data and information accumulated for ten years after the excavation and research on the current conditions of vegetation in the river channel. The study found that fast flow velocity due to high water levels in the river may allow Salix chaenomeloides at farther upstream points to travel to excavation points.
