Erosion and deposition characteristic analysis of tail reaches in the Yellow River Estuary in recent years

The characteristic of erosion-deposition variation of the tail reach in the Yellow River Estuary have been studied since the tail reach changed to Qingshuigou flow path in the period of 1976-2005.The results show that: ① During 1976-2005,the estuary reaches experienced the process of strong deposition,intense erosion,continuous deposition,and continuous erosion,etc.The erosion-deposition is related to the incoming water and sediment condition,the shifting of the flow path,the deposition extending of the estuary reach, the riverbed boundary condition,and so on.② The erosion-deposition of the Lijin section—CS7 reach is related to the runoff and the empirical coefficient of the runoff and sediment load at Lijin station,especially the discharge over(2 000m~3/s.) ③The erosion-deposition below CS7 is correlated with the water and sediment flux,the riverbed boundary condition,the reach extension and so on.