黏性泥沙絮网结构形成过程研究  

Settling experiments of cohesive sediment in still water

作　　者：王维[1] 李绍武[1] 

机构地区：[1]天津大学水利工程仿真与安全国家重点实验室,天津300072

出　　处：《泥沙研究》2014年第1期68-73,共6页Journal of Sediment Research

摘　　要：黏性泥沙的沉降和沉积过程是泥沙运动力学的一个重要研究内容。采用连云港徐圩港区航道淤积物,分别在30cm高量筒和200cm高自制沉降筒中进行了静水沉降试验,观测了清浑水交界面的形成和沉降过程,测量了沉降过程中清浑水交界面以下含沙量垂向分布。通过分析试验结果,提出了一种根据清浑水交界面沉降速度判定絮网结构形成的新方法,并据此初步解释了黏性泥沙沉降过程中制约沉降、絮网沉降和絮网密实三个不同沉降阶段絮团间作用的差异。The processes of settling and consolidation of cohesive sediment are an important topic of sediment dynamics. Settling experiments were conducted in the tubes of 30cm and 200cm high, respectively, by using the sediment sampled from the navigation channel of Xuwei section, Lianyungang Port. In the experiments, the formation of the turbid interfaces and the processes of sediment settling and consolidation were observed. The vertical distributions of sediment concentration were measured in some experimental cases. A new ap- proach is proposed based on the experimental results for judgement of formation of floc network according to the variation of the settling velocity of the turbid interface. The differences of interaction among flocs in the three settling stages of hindered settling, floc network settling and floc consolidation can be accounted for, respec- tively, based on the measured results of the settling process of the cohesive sediment.

关 键 词：黏性泥沙 静水沉降 絮网结构 清浑水交界面 

分 类 号：TV143.4[水利工程—水力学及河流动力学]