水科学进展2023，Vol.34Issue(5)：697-707,11.DOI:10.14042/j.cnki.32.1309.2023.05.005
三峡水库蓄水后下游河道悬沙恢复效率
Efficiency of suspended sediment recovery in the downstream reaches of the Three Gorges Reservoir
摘要
Abstract
In the riverbed erosion process caused by unsaturated water and under the influence of multiple factors,the process of suspended sediment recovery along the downstream reach of a dam is quite complex.To comprehensively explore the mechanism of suspended sediment recovery,the suspended sediment saturation(SSS)and the saturation recovery efficiency coefficient(SREC)were selected as key parameters to describe the suspended sediment recovery degree and efficiency,respectively.Based on field-measured flow and sediment data for the Yichang—Datong reach,the variation tendency and influencing factors of the SREC were analyzed and described,and empirical equations to quantify the SREC were established.The results revealed that:① In the downstream reaches of the TGR,the SREC shows no consistent variation trend over time,but generally decreased with increasing erosion distance.Among the whole reach,the degree of total suspended sediment recovery per unit river length in the Zhicheng—Shashi reach is the highest,whereas the lowest in the Luoshan—Hankou reach.The former is approximately 23 times more than the latter.②The efficiency of suspended sediment recovery is affected by the inlet SSS,bed material supply intensity and flow discharge.The SREC decreased with increasing inlet SSS and increased with increasing bed material supply intensity.The SREC decreased with increasing flow discharge under a positive bed material supply intensity and increased with increasing flow discharge under a negative bed material supply intensity.③ Based on the relationship between the SREC and the influencing factors,i.e.,the inlet SSS,bed material supply intensity and flow discharge,the empirical models for calculating the suspended sediment concentrations in total and each size group were established at the reach outlet.关键词
悬沙恢复/不平衡输沙/含沙饱和度/饱和度恢复效率系数/三峡水库Key words
suspended sediment recovery/non-equilibrium sedimentation/suspended sediment saturation/saturation recovery efficiency coefficient/Three Gorges Reservoir分类
建筑与水利引用本文复制引用
陈立,王愉乐,邹振华,李雨晨,余博闻,余长伍..三峡水库蓄水后下游河道悬沙恢复效率[J].水科学进展,2023,34(5):697-707,11.基金项目
国家重点研发计划资助项目(2016YFC0402101) （2016YFC0402101）
三峡工程泥沙重大问题研究项目(12610100000018J129-03)The study is financially supported by the National Key R&D Program of China(No.2016YFC0402101)and the Research Project on Major Sediment Problems of the Three Gorges Project,China(No.12610100000018J129-03). （12610100000018J129-03）
