基于悬移质泥沙分布理论的泥沙扬动流速公式
发布时间：2018-10-19 17:48
【摘要】：扬动流速是泥沙由间歇性滚动、滑动、跳跃运动转化为悬浮运动的临界流速,确定扬动流速对于预判沙质河床冲淤状态具有重要意义。在回顾前人研究成果的基础上,认为扬动流速概念适用的对象主要是非黏性沙质颗粒,它们的扬动状态同含沙量垂线分布图形存在的关系较为清晰,从而依据张红武及张罗号先后建立的含沙量垂线分布公式分别计算了不同悬浮指标下相对含沙量为0.85时的相对水深,得到一定水流条件下的颗粒悬浮高度拟合关系式,再通过假定泥沙扬动的临界状态为颗粒实际离开床面的运动高度已达相对水深0.03,即可得出泥沙扬动流速公式。通过与沙玉清和张罗号扬动流速公式的比较以及沙质河床实测水沙资料的检验,结果表明本文建立的泥沙扬动流速公式能较好地描述天然河流的泥沙扬动规律。
[Abstract]:The lifting velocity is the critical velocity of sediment from intermittent rolling, sliding and jumping motion to suspended motion. It is important to determine the lifting velocity for predicting the scour and deposition state of sandy riverbed. On the basis of reviewing the previous research results, it is considered that the main objects for the concept of lifting velocity are non-viscous sand particles, and the relationship between their lifting state and the distribution pattern of vertical distribution of sediment content is relatively clear. According to the vertical distribution formula of sediment content established by Zhang Hongwu and Zhang Luo respectively, the relative water depth of 0.85 relative sediment content under different suspended indexes is calculated, and the fitting formula of particle suspended height under certain water flow condition is obtained. By assuming that the critical state of sediment uplift is that the moving height of particles leaving the bed surface has reached the relative water depth of 0.03, the formula of sediment lifting velocity can be obtained. By comparing with the formula of lifting velocity of Shayuqing and Zhangluo, and checking the measured data of water and sediment in sandy river bed, the results show that the formula established in this paper can better describe the law of sediment movement in natural rivers.
【作者单位】： 内蒙古农业大学水利与土木建筑工程学院;
【基金】：内蒙古水利科技重点项目 国家重点研发计划项目(2016YFC04022500)
【分类号】：TV142
本文编号：2281884
[Abstract]:The lifting velocity is the critical velocity of sediment from intermittent rolling, sliding and jumping motion to suspended motion. It is important to determine the lifting velocity for predicting the scour and deposition state of sandy riverbed. On the basis of reviewing the previous research results, it is considered that the main objects for the concept of lifting velocity are non-viscous sand particles, and the relationship between their lifting state and the distribution pattern of vertical distribution of sediment content is relatively clear. According to the vertical distribution formula of sediment content established by Zhang Hongwu and Zhang Luo respectively, the relative water depth of 0.85 relative sediment content under different suspended indexes is calculated, and the fitting formula of particle suspended height under certain water flow condition is obtained. By assuming that the critical state of sediment uplift is that the moving height of particles leaving the bed surface has reached the relative water depth of 0.03, the formula of sediment lifting velocity can be obtained. By comparing with the formula of lifting velocity of Shayuqing and Zhangluo, and checking the measured data of water and sediment in sandy river bed, the results show that the formula established in this paper can better describe the law of sediment movement in natural rivers.
【作者单位】： 内蒙古农业大学水利与土木建筑工程学院;
【基金】：内蒙古水利科技重点项目 国家重点研发计划项目(2016YFC04022500)
【分类号】：TV142
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1 蒋智勇,程和琴,.陈中原,陈吉余;长江口非均匀细颗粒粘性泥沙扬动流速[J];人民长江;2003年07期
，本文编号：2281884
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