Channel re-establishment of the Lower Yellow River in ten years operation of Xiaolangdi Reservoir

The Xiaolangdi Hydro-Project is a large project downstream of the Sanmenxia Project in the Yellow River playing the role of flood control and sedimentation mitigation.The reservoir has been operated for 10 years.Based on the field measured data,the reservoir sedimentation and the channel re-establishment of the Lower Yellow River including the morphology of the reservoir deposition,the density current and its sediment transport,the characteristics and efficiency of channel erosion,the coarsening of bed sediment and effects of channel armoring,the relationship between reservoir deposition and channel erosion,as well as the compensation index of reservoir deposition,are analyzed and expounded in this paper.These results are helpful to understand the new behavior of fluvial processes of the river carrying large amount of sediment load such as the Yellow River in the initial period of reservior operation.