Abstract: The readjustment of reservoir-downstream channels is important to both local fluvial morphology and human activities.According to the observation of hydrology,landform and riverbed sediment,this study analyzed the scour,incision and bed matenal armoring of Yichang-Yangjianao channel,which is located at the downstream of the Three Gorges project(TGP).The results show that the incoming sediment of Yichang station is significantly decreased due to TGP impoundment,thus the study channel is scoured.The main eros...