Abstract

Through two-dimensional mathematical model, it is studied that the influence of “secondary hang river” to stream distribution between flood plain and main channel, velocity of parallel levees. It can be obtained the critical velocity of erosion resistance to levels is 0.8m/s in Lower Yellow River, based on actual velocity of parallel levees and indoor scour resistance experiment. So it can be received that the difference should be little than 2.5m between the nature levees’ elevation and average elevation of flood plain near the levees, when bankfull discharge was 4000 m³/s and the topography was the one in 1999 after flood and no consideration of production levees.

Keywords: Secondary hang river; Difference of elevation; Velocity of erosion resistance; Lower Yellow River