River engineering model and flood prediction at Lanzhou section of the Yellow River

On the basis of the hydrologic data from 1981 to 2001, the evolution of river bed at Lanzhou section of the Yellow River was analyzed. A river-dredging plan with 300 m of river width was put forwarded by studying the river engineering model experiments. The flood level and water surface profile in different design flood (5 600 m3/s, 6 500 m3/s, 7 920 m3/s, 8 350 m3/s) were gotten with this design. The flood prediction was also proposed.