Effects of Two Banks Regulation on the Wandering Reach of Lower Yellow River

Based on Theory of Scouring during Flood Rising and Deposition during Flood Falling 

QI Pu1, PENG Hong1, QI Honghai2，ZHANG Mingwu1

(1，Key Laboratory of Yellow River Sediment of the Ministry of Water Resources, Yellow River Institute of Hydraulic Research, Yellow River Conservancy Commission, Zhengzhou 450003, China; 2, WSP-Parsons Brinckerhoff, Lawrenceville, New Jersey  08648，USA)

【Abstract】Based on the field measured data, the characteristics of sediment transport and scouring in the lower Yellow River and its main tributaries, the Missouri River and the Mississippi River are analyzed. The features of sediment transport, scouring and siltation of low-sediment concentration floods and hyper-concentrated floods are as follows: although the slope becomes mild along the river, the width becomes narrow and flow velocity increases, which creates the boundary condition of flood and sediment balance in alluvial rivers. 

The movement of the bottom sediment is slower than that of the flood wave. This is the fundamental reason for the long - distance scour in the river channel, which is not related with whether the gradient of the river is mild or steep. The characteristics of sediment transport can be described as "more sediment supply, more sediment being transported", which is the hydrodynamic condition of scouring along the river bed. Through the regulation of both banks of the lower Yellow River, a narrow, straight and stable river channel can be formed. The role of flood for bed-forming and sediment transport will be strengthened, as well as increasing its function of bed erosion.

【Keywords】regulation width; narrow and deep channel; scour during flood rising and deposition during flood falling; unsteady sediment transport by floods; the Yellow River 

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