摘要
本文对非均匀程度较大的推移质输移规律进行了研究.认为在分析输沙率与水流推移力之间的关系时,只有作用在运动沙粒上的有效推力才是有意义的,而作用在不动边界上的推力,不能推移泥沙运动;而且,沙粒所受水流推力的大小取决于沙粒投影面积的大小,而与本身的重量无关,从而求得了有效推移力的关系式.在此基础上,考虑了床面泥沙起动的随机性以及非均匀泥沙的起动规律,推得了非均匀泥沙的推移质输沙率公式.该式与其他学者的研究成果吻合尚好,并能够用于计算均匀沙的推移质输沙率.
Natural river beds are composed of nonuniform sediment mixtures, whose movement is different from that of uniform sediment. Thus, to study the movement of nonuniform sediment is very important not only in theory but also in practice. In this paper, bedload transport capacity of nonuniform sediment has been studied, and in the study, to consider the threshold motion law of nonuniform sediment as a parameter. The results obtained by theoretical analysis and laboratory experiments fit in pretty well with the results of experimental and field data from existing literatures. It proves that the formula (20) is reasonable, which can be applied to calculate the bedload transport rate of nonuniform sediment and uniform sediment also.
出处
《泥沙研究》
CSCD
北大核心
1989年第2期36-45,共10页
Journal of Sediment Research
