Study on Evolution of River Bed and Flood Prediction at Lanzhou Section of Yellow River

Yellow River through Lanzhou city, so flood prevention is a very important for Lanzhou city. On the basis of the hydrologic data from 1951 to 2011 year, using river engineering model experiment, design flows and design flood hydrograph of Lanzhou section of Yellow River was simulated. On the basis of the hydrologic data from 1951 to 2011 year, evolution of river bed at Lanzhou section of Yellow River was analyzed. Sedimentation has been increasing slowly since 60 years. By the river engineering model experiments, a river-dredging plan, river width is planned 300 m, had been put forwarded. And the design flood level and water surface profile in different design flood (5600 m3/s,6500 m3/s,7920 m3/s,8350 m3/s) of Lanzhou section are gotten. It is forecast that occurrence of deluge is possible.