Based on data from the Huanghe(Yellow) River,the sediment storing-releasing process in an alluvial channel has been studied.The results show that in a hydrological year,sediment storing occurs during the high-flow season and sediment releasing occurs in the low-flow season.The amount of sediment storage in the high-flow season exceeds that of sediment release in the low-flow season,and net storage is positive for the whole year.Some thresholds for the critical storing-releasing state of the channel have bee...