Flood-control impact of flood diversion area operational methods in lower Yellow River

The existence of flood diversion area could parting flood which overfufilled the quota temporarily and reduce the flood water lever in the lower river reach effectively,thus decreasing the pressure of the lower river reach.While the operational methods of flood diversion area would cause varying degrees impact on flood-control result.This paper builds a mathematical model on flood evolution of typical reach in the lower Yellow River which is based on MIKE21software.By comparing development process of the flood,flood water level in the lower river reach changes of peak discharge and the flood volume entered into flood diversion area under different situations.Study on the flood-control impact under different operational methods and entrance position of flood divertion area in the lower river reach.The results show that use the flood diversion rationally according to the flood process of upstream is benefical to decrease the pressure of the lower Yellow River.And the entrance position of flood divertion area also has obvious influence on reach flood-control.