水科学进展2026，Vol.37Issue(3)：515-527,13.DOI:10.14042/j.cnki.32.1309.2026.03.010
黄河下游同流量下洪水位时空演变特点与机制
Spatial and temporal evolution characteristics and mechanisms of flood level at identical discharges in the Lower Yellow River
摘要
Abstract
Driven by continuous channel degradation,the water level-discharge relationship has undergone significant changes in the Lower Yellow River(LYR).Based on the hydrological and topographic data from six hydrometric stations in the LYR from 1986 to 2023,this study investigated the characteristics and mechanisms of flood-level changes in the LYR,and quantified the effects of channel morphological adjustment and channel resistance variation on flood levels at a given discharge.Results show that:①Before the operation of the Xiaolangdi(XLD)Reservoir(1986-1999),flood levels at all six stations showed an overall upward trend,with the values at a discharge of 4 000 m3/s increasing by 1.43-1.78 m.After the XLD Reservoir operation(1999-2023),flood levels at 4 000 m3/s decreased by 1.51-3.40 m.②The decline in flood levels at identical discharges was positively correlated with channel scour volumes.For each 100 million m of scour in the braided,transitional and meandering reaches,flood levels at 4 000 m3/s dropped by 0.17-0.85 m at the corresponding stations.③Numerical experiments were used to quantify the contributions of different factors on flood levels at 4 000 m3/s between 1986 and 2020.It revealed that increased channel resistance raised flood levels of 0.45-0.91 m,whereas channel morphological changes lowered them by 0.59-1.58 m.Downstream of the Sunkou Station,these two effects largely offset each other,resulting in little net change.While in the upstream reach,the flood-level rise attributable to increased channel resistance was less pronounced than the decline caused by riverbed incision,but it still counteracted 24.3％of the total flood-level decrease.关键词
洪水位/河床冲刷/河床下切/河道阻力/黄河下游Key words
flood level/riverbed erosion/riverbed incision/channel resistance/the Lower Yellow River分类
建筑与水利引用本文复制引用
徐家祥,夏军强,周美蓉,郑钊,陈翠霞..黄河下游同流量下洪水位时空演变特点与机制[J].水科学进展,2026,37(3):515-527,13.基金项目
国家自然科学基金项目(U2443222 （）
U2243238) The study is financially supported by the National Natural Science Foundation of China(No.U2443222 （）
No.U2243238). （）
