粗糙床面非均匀颗粒分选作用下的团聚特性试验研究OA

The activity of non-uniform sediment particles significantly impacts riverbed evolution and stability.To investigate the agglomeration characteristics of non-uniform particles under hydraulic sorting,flume experi-ments were conducted using particles of varying sizes.Under different hydraulic conditions,the movement processes of non-uniform particles was captured by high-definition cameras.Under hydraulic sorting,particles formed four types of agglomerates,including strip,curve,triangle,and rhombus.The leading end of strip-shaped agglomerates captures particles,forming particle accumulation;at the trailing end,the squeezing force of particles weakens,and larger particles move under flow action,causing the strip-shaped structure to trans-form into a curve-shaped one.The trailing end of curve-shaped agglomerates undergoes displacement due to flow disturbance,evolving into closed triangle and rhombus shapes.Agglomerate stability was assessed using the defined proportion difference ΔP.Strip and curve agglomerates exhibited significant flow-induced instabili-ty,while rhombus agglomerates demonstrated the highest stability,followed by triangle ones.This study sys-tematically reveals the agglomeration characteristics and evolution laws of non-uniform particles under hydraulic sorting,providing quantitative evidence for regulating riverbed stability.