摘要
推移质泥沙颗粒的跃移是河流泥沙运动的重要形式。为了研究推移质颗粒跃移运动参数的变化规律,在水槽试验中采用高速摄像技术,观测7种工况条件下,0.3~1.7 mm粒径的推移质颗粒的跃移运动形态,提取颗粒跃移运动的时空信息,分析了泥沙颗粒跃移距离和跃移高度的变化规律。结果表明,相对跃移高度和相对跃移距离的概率密度分布函数均服从Γ分布,对比前人的试验结果发现,4组试验颗粒的相对跃移距离概率分布的峰值提前,而其他3组试验结果的峰值几乎同时出现。试验值与韩其为公式的计算值基本符合,验证了理论计算值的合理性和可靠性。随着无量纲化水流流速的增大,颗粒跃移高度和跃移距离呈现逐渐增大的趋势。
Saltation of sediment particles is an important form of bedload movement in water flow.To further study on the rules of bed-load saltation,high-speed camera technology was used to observe the saltation status of bed-load particles with particle size between 0.3 mm to 1.7 mm under seven kinds of operating conditions in flume test.The trajectory of saltation was analyzed,and the saltation length and height of a large number of sediment particles were studied.The results show that the probability density distribution of relative saltation height and length submit to theΓ-distribution.By comparing the previous experimental results,it is found that the peak value of the probability distribution of the relative jump distance of particles in this test is ahead of time,while the peaks of the other three groups of test results appear at the same time,which is different from the previous understanding.Experimental results were in good agreement with the theoretical calculation,verified the reliability of theoretical calculation.With the increase of dimensionless flow velocity,the saltation height and length of the particles showed a trend of increasing gradually.
作者
郭子扬
张磊
关见朝
黄海
GUO Zi-yang;ZHANG Lei;GUAN Jian-zhao;HUANG Hai(College of Life and Environmental Sciences,Minzu University of China,Beijing 100081,China;State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin,China Institute of Water Resources and Hydropower Research,Beijing\0004S,China)
出处
《泥沙研究》
CAS
CSCD
北大核心
2022年第1期16-22,共7页
Journal of Sediment Research
基金
国家重点研发计划项目(2017YFC0405305)
中国水科院基本科研专项(SE0145B702017,SE0145B362016)
财政部三峡工程泥沙重大问题项目(12610100000018J129-5)。
关键词
推移质
跃移高度
跃移距离
高速摄影
水槽试验
bed load
saltation height
saltation length
high speed shoot
flume experiment
