长江中下游蓄滞洪区洪水控制效果研究OA

During joint operation,the 42 national flood storage and detention areas in the middle and lower reaches of the Yangtze River are prone to mutual nesting and interaction,which has long been a challenge for flood control in the region.To address the issues of systematicity and coordination in the joint operation of flood storage and detention areas,this study applied a self-developed joint operation model for flood storage and detention areas in the middle and lower reaches of the Yangtze River.A refined operation system was established,covering the tributary and main stream systems of the middle and lower reaches of the Yangtze River,as well as the 42 flood storage and detention areas.Based on the reconstruction of historical major floods,the study focused on the joint operation strategies of flood storage and detention areas and the flood control effects.The results show that for defending against the flood of 1870,the actual flood of 1954,and the 1954-type flood with a 300-year return period,a joint operation strategy combining"upstream reservoir group impoundment and cascaded activation of middle and lower flood storage and detention areas"can effectively control flood levels at Shashi,Lianhuatang,Hankou,and Hukou stations by activating 3,24,and 36 flood storage and detention areas,respectively.The study quantitatively reveals the differences in flood diversion efficiency among flood storage and detention areas in different regions(generally 60%～82%).It identifies key nonlinear factors affecting flood diversion efficiency,including the scale of flood diversion sluices of flood storage and detention areas,the distance to control stations,the upstream/downstream relationship with control stations,and the initial river stage conditions during flood diversion.The findings can provide a reference for flood control operation decision-making in the Yangtze River basin.