Study on Regulation Index and Operation Mode of the Yellow River Water and Sediment Regulation

The applying effect of the Yellow River water and sediment regulation after the operation of Xiaolangdi Reservoir was analyzed,and the new questions were discussed.To enhance the sediment transport rate of water and sediment regulation,the regulation index was proposed and the flood process should be regulated with the flood peak between 2 500-4 000 m3/s and the flood process needed to keep at least 6 d.The flood discharge process of water and sediment regulation should adopt the shape of rectangular wave and the discharge value should be larger under the promise of floodplain safety.According to the current application stage and the utilization requirements of Xiaolangdi Reservoir,the water and sediment regulation goal of Xiaolangdi Reservoir should be changed to prevent sediment at a moderate level so as to keep the flow capacity of the lower the Yellow River's main channel at 4 000 m3/s as long as possible.The suitable utilization mode of water and sediment regulation should take into consideration the deposition of Xiaolangdi Reservoir and the change of the flow capacity in lower Yellow River and other factors.