Study of flood-control function of flood diversion and detension by utilizing floodplain in lower Yellow River

Relying on existing productive embankments planning flood diversion and detension area in the lower Yellow River floodplain,is an idea to develop the Yellow River floodplain,which could develop production during dry seasons and buffer the flood during flood seasons.This paper establishes a mathematical model of flood evolution from Jiahetan reach to Gaocun reach in the lower Yellow River based on MIKE21software;and then studying the process of flood submergence in the lower Yellow River floodplain of typical river reach based on three conditions,i.e.nature condition,current condition,planning condition.The authors comparatively analyze the maximum detention volume and inundated area in the flood detention basin,the process of peak discharge,and the change of flood stage in the lower floodplain area.The results show that inundated area is reduced due to the existence of flood diversion and detension area.And the function of peak cut and flood detention are obvious.The flood diversion and detension area can also decrease the pressure of the lower Yellow River and decrease the pressure of the river for effectively protecting the production.