花园口—孙口河段漫滩洪水演进特征分析

Study on the Evolution Characteristic of Over-Bank Flooding in Huayuankou-Sunkou Reach of the Lower Yellow River

分析了黄河下游花园口—孙口河段漫滩大洪水演进中洪峰峰型、洪峰传播速度、削峰率、洪水位等的变化情况,结果表明:①当花园口洪峰流量大于9 500 m3/s后,花园口—夹河滩、夹河滩—高村和高村—孙口3个河段的洪峰传播速度呈逐渐减缓的趋势;②大洪水时,各河段削峰率随着花园口站洪峰流量的增大而略有增大,花园口—夹河滩、夹河滩—高村、高村—孙口河段每百公里削峰率的平均值分别为6.4%、6.7%和8.2%。

The paper analyzed the flood peak type,the spread velocity of flood peak,the peak-clipping rate and the flood stage in over-bank flood evolution in the lower Yellow River,for example Huayuankou-Sunkou reach.The outcomes shows that when the peak discharge of Huayuankou Station is greater than 9 500 m3/s,the spread velocity of flood peak is decreasing gradually in Huayuankou-Jiahetan reach,Jiahetan-Gaocun reach and Gaocun-Sunkou reach;along with the increase of peak discharge in Huayuankou Station,the peak-clipping rate also increases,and the average value of the peak-clipping rate is 6.4%、6.7% and 8.2% respectively in Huayuankou-Jiahetan reach,Jiahetan-Gaocun reach and Gaocun-Sunkou reach.