The Yellow River Estuary (YRE) alternatively experienced channel aggradation and degradation during the period 1990–2016. To study the variation in flood discharge capacity during the process of river bed evolution, bankfull characteristic parameters were investigated on the basis of measured hydrological data and surveyed cross-sectional profiles, which was crucial for comprehending the processes and the key factors to cause these rapid changes. A reach-averaged method was presented in this study in order to calculate the characteristic bankfull parameters in the YRE, and this method integrated the geometric mean using the logarithmic transformation with a weighted mean based on the distance between the two successive sections. The reach-averaged bankfull parameters in the tail reach of the Yellow River Estuary (the Lijin-Xihekou reach) during the period 1990–2016 were then calculated. Calculated results indicated that the adoption of a concept of reach-averaged bankfull discharge was much more representative than the cross-sectional bankfull discharge, and the results also indicated that bankfull discharges decreased during the process of channel aggradation, and increased during the process of channel degradation. Finally, an empirical formula and a delayed response function were established between the reach-averaged bankfull discharge and the previous 4-year average fluvial erosion intensity during flood seasons, and both of them were adopted to reproduce the reach-averaged bankfull discharges, and calculated results showed high correlations (R² > 0.8) of these two methods.

黄河口（YRE）在 1990-2016 年期间交替经历了河道加成和退化。为研究河床演变过程中洪水流量的变化，在实测水文资料和实测横断面剖面的基础上，研究了河岸特征参数，这对于理解这些过程和导致这些快速变化的关键因素至关重要。变化。为了计算YRE中的特征银行参数，本研究提出了一种平均法，该方法使用对数变换将几何平均值与基于两个连续部分之间的距离的加权平均值相结合。然后计算了 1990-2016 年期间黄河口尾段（利津-西河口段）的河段平均满岸参数。计算结果表明，采用河段平均岸边流量的概念比横断面岸边流量更具代表性，结果还表明，岸边流量在河道加成过程中减少，在河道加成过程中增加。降解。最后，建立了河段平均岸边流量与前4年汛期平均河道侵蚀强度之间的经验公式和延迟响应函数，并采用两者再现河段平均岸边流量，并计算结果显示高度相关（计算结果表明，采用河段平均岸边流量的概念比横断面岸边流量更具代表性，结果还表明，岸边流量在河道加成过程中减少，在河道加成过程中增加。降解。最后，建立了河段平均岸边流量与前4年汛期平均河道侵蚀强度之间的经验公式和延迟响应函数，并采用两者再现河段平均岸边流量，并计算结果显示高度相关（计算结果表明，采用河段平均岸边流量的概念比横断面岸边流量更具代表性，结果还表明，岸边流量在河道加成过程中减少，在河道加成过程中增加。降解。最后，建立了河段平均岸边流量与前4年汛期平均河道侵蚀强度之间的经验公式和延迟响应函数，并采用两者再现河段平均岸边流量，并计算结果显示高度相关（结果还表明，满岸流量在河道退化过程中减少，在河道退化过程中增加。最后，建立了河段平均岸边流量与前4年汛期平均河道侵蚀强度之间的经验公式和延迟响应函数，并采用两者再现河段平均岸边流量，并计算结果显示高度相关（结果还表明，满岸流量在河道退化过程中减少，在河道退化过程中增加。最后，建立了河段平均岸边流量与前4年汛期平均河道侵蚀强度之间的经验公式和延迟响应函数，并采用两者再现河段平均岸边流量，并计算结果显示高度相关（R ² > 0.8) 这两种方法。