利用黄河下游高村至孙口河段漫滩洪水观测资料 ,分析了过渡型河段漫滩洪水演进规律及其影响因素 .结果表明 :过渡型河段河槽弯曲 ,滩地多、面积大、连通性差 ,在险工、护滩控导工程控制下 ,主槽相对稳定 ,河道横向淤积分布不均 ,主槽冲淤变化大 ,滩地低洼、蓄滞洪能力大 .滩地蓄滞洪能力、主槽排洪能力与不同量级不同类型洪水的不同组合 ,是造成漫滩洪水洪峰流量削减、洪峰形状变形、传播时间变化的主要原因 Using flood observation data of floodplain from Gaocun-Sunkou reach of the lower Yellow River, the floodplain evolution and its influencing factors in the transitional reach are analyzed.The results show that the floodgates in the transitional reach have many features such as bend, Under the control of dangerous workers and the beach control project, the main channel is relatively stable, the horizontal siltation of the river channel is unevenly distributed, the main channel changes greatly in ebb and flow, the low lying beach and the capacity of flood storage and detention. Different combinations of different types of floods of different magnitudes are the main causes of the flood peak flow reduction, the peak shape deformation and the propagation time of floodplain