Abstract: To understand the scouring intensity and scope in the middle Hanjiang River, we summarized the erosion regularity up to 2005 through years of observation. In this research, regularities of recent scouring in the reach from Danjiangkou to Nianpanshan are analysed according to observation data in the downstream of Danjiangkou dam from 2005 to 2012.It’s concluded that the erosion intensity in the downstream of dam varies with the scouring time and the distance to dam. With time goes by, major erosion develops from Danjiangkou-Xiangyang reach towords the downstream. In recent years the river reach from Cuijiaying to Nianpanshan was subjected to major scouring. Due to the changes in operation mode caused by the heightening of Danjiangkou dam, it is suggested to strengthen the monitoring and analysis on the erosion in the downstream of Danjingkou dam.

Key words: middle stream of Hanjiang river, Danjiangkou reservoir, water and sediment transport, erosion intensity, sediment concentration