水力发电学报2025，Vol.44Issue(6)：12-21,10.DOI:10.11660/slfdxb.20250602
三峡库区泥沙絮凝沉降试验研究
Laboratory study on flocculation and settling behaviours of sediment from Three Gorges Reservoir
摘要
Abstract
Analysis of the prototype sediment collected from the Three Gorges Reservoir(TGR)indicates roughly 80%of the accumulated sediment is less than 20 μm in size,but it remains unclear whether such sediment mixture could form flocs while settling.This study has designed a coaxial double-cylinder rotational flocculation device for non-intrusive observation of the flocculation and settling of sediment collected from TGR,and conducted two series of tests,modelling the water-sediment conditions of the reservoir in the laboratory and adopting the image technology to identify settling particles.The results show that the measured settling velocity of particles is significantly different from those of single sediment particles of the same size,and a significant portion of settling particles exceeds the maximum size of the input sediment,indicating the flocs of TGR sediment would form in the prototype reservoir.Then,we develop a relationship between Reynolds number and drag coefficient for the flocculated sediments,and derive the density of the flocs based on the fractal theory,and a relationship between flocs'effective density and size.Finally,we develop two methods for calculating the settling velocity of sediment-induced flocs,and verify them against measurements,showing a satisfactory agreement.关键词
三峡库区/泥沙/絮凝体/密度/沉速Key words
Three Gorges Reservoir/sediment/floc/density/settling velocity分类
水利科学引用本文复制引用
王乐,陈庆霞,王大宇,关见朝,张磊,黄海,张尚弘..三峡库区泥沙絮凝沉降试验研究[J].水力发电学报,2025,44(6):12-21,10.基金项目
国家重点研发计划项目(2022YFC3202003) （2022YFC3202003）
中国水利水电科学研究院水利部泥沙科学与北方河流治理重点实验室开放研究基金项目(IWHR-SEDI-2023-03) （IWHR-SEDI-2023-03）
国家自然科学基金委员会青年科学基金项目(52009041) （52009041）
