高含沙水流逆行沙浪探讨

Anti-dunes in Hyper-concentrated Flows

在进行高含沙饱和输沙水槽实验中对所发生的逆行沙浪进行了反复实验和观测 ,对有无泥浆的高含沙水流实验进行了对比 ,对形成逆行沙浪的条件进行了描述 ,利用本实验以及天然河流资料提出了沙浪波长的计算公式 。

Two types of hyper concentrated flow experiments with a maximum sediment concentration of around 1000 kg/m 3 were conducted in the flume. The first type contains finer sediment particles and the other consists of coarser particles. It was found that anti dunes often occurred in the first type experiments when flow was increased. An equation for calculating the length of sand dunes is given and discussed based on the data from the experiments and some rivers. It was also found in the experiments that there exists reversibility in sand wave evolutions, i.e., sand dunes can form after movable flat bed, and movable flat bed could form after anti dunes.