黄河下游过渡型河段漫滩洪水演进规律探讨

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

Overbank Flood Routing Regularity for Transitional Stretch of Lower Yellow River

By use of the observed data from Gaocun—Sunkou reaches on the down stream of the Yellow River analysed the overbank flood routing regularity and the impact of transitional reach are analysed.The result shows that these transitional reaches are characterized by winding river channels,multi river floodplain,large area and poor linking and passing ability.By means of controlling and protecting projects of those flood plains,the main river channel has become stable,however,the distribution of siltation in the lateral direction is uneven.The main cause of the peak overbank flow deduction,change of the peakflow shape and change of the transition time is the different combinations of the abilities of flood storage and detention of floodplains,and the flood carrying capacity of the main river channel.