Based on the transport capability of water and sediment discharge,this paper discusses the analysis system of the mechanism and causes of channel processes.

Application of the　sediment transport capacity models to unsteady sediment transport from overland flow;

Effect of ratio of width to depth of river channel on sediment transport capacity in Lower Yellow River

The sediment transporting capacity evolution of an overloaded river is evidently manifested in thechange of the cross section of the river channel.

The sediment transporting capacity of the lower Yellow River is expressed by a formula of sediment transporting capacity of differ- ent river types.

The first bed-forming discharge represents equivalent discharge of sediment transporting capacity in variable discharge process,i.

It is suggested that more in depth study on excess sediment carrying capacity as well as discharging sediment through density flow be done.

This paper briefly introduces the hydraulic research results by the research team of the project named diversion capacity and icing disaster prevention of the Middle Route of the South-to-North Water Diversion Project(MRSNWDP) which is supported by the National Key Technologies R & D program of China during the Eleventh Five-year Plan.