摘要
在现有研究成果的基础上,通过分析大量天然河道实测资料和他人的水槽试验资料,发现在挟沙水流中,综合糙率系数与水深、流量的相关性较差;与含沙量的相关性较好,并且糙率系数随含沙量的增加先减小后增大;在一定佛氏数条件下,糙率系数与佛氏数的相关性最好,且随佛氏数的增加而减小,可以根据佛氏数来计算糙率系数,但在较大佛氏数后,二者关系出现"向上翘"现象。
Based on the analyses of the field and flume experimental data, the integrated roughness of sedimentladen flows has been studied. It indicates that the roughness has a poor relationship with the flow discharge and depth, but a good relationship with sediment concentration. Besides, the roughness increases first and then decreases with the increase of sediment concentration. The study also shows that for a certain range of Froude number (Fr), the roughness has a very good relationship with the Fr and therefore the roughness can be calculated if Fr is known.
出处
《泥沙研究》
CSCD
北大核心
2007年第5期24-29,共6页
Journal of Sediment Research
基金
"十一五"国家科技支撑计划(2006BAB06B03-02)
中国水利水电科学研究院青年基金(NJQN0601)
关键词
高含沙水流
综合糙率系数
含沙量
佛汝德数
hyperconcentrated flow
roughness'
sediment concentration
Froude number