文章摘要
张罗号,张红武,赵晨苏.冲积河流沙质河床推移质级配分布规律[J].水利学报,2017,48(12):1465-1472
冲积河流沙质河床推移质级配分布规律
Bed load graduation of sandy bed in alluvial river
投稿时间:2017-05-16  
DOI:10.13243/j.cnki.slxb.20170468
中文关键词: 泥沙级配  推移质  紊流  动量  沙质河床
英文关键词: Graduation  Bed load  Turbulence  Momentum  Sandy bed
基金项目:国家重点研发计划项目(2016YFC0402500)
作者单位
张罗号 河海大学 水利水电学院, 江苏 南京 210098 
张红武 清华大学 水沙科学与水利水电工程国家重点实验室, 北京 100084 
赵晨苏 北京科技大学 土木与资源工程学院, 北京 100083 
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中文摘要:
      推移质级配是进行推移质输沙率、河床冲淤等计算模拟的重要条件。本文从分析沙质河床近壁紊动源区内泥沙运动临界图景入手,运用瞬时动量对撞平衡原理得到推移质泥沙临界运动条件,并基于垂向瞬时紊动速度所具有的高斯分布规律,求解随机方程,建立了理论性较强的沙质河床推移质颗粒级配计算公式。黄河与长江的实测资料检验结果表明,本文提出的公式能同天然沙质河床推移质实测资料符合,因而对于确定冲积河流沙质河床推移质泥沙级配具有重要的理论意义和实用价值。
英文摘要:
      Bed load graduation of sandy bed in alluvial river is a key in the calculations such as bed load transport rate, riverbed erosion and siltation. In this paper, pattern of critical condition of sediment transport in near-wall region of sandy bed was analyzed firstly, and according to the law of momentum balance,the critical settling-rising condition of bed material in sandy bed was obtained. Based on the vertical instantaneous turbulent velocity abiding by Gaussian distribution, a theoretical relation for calculating bed load graduation in sandy bed was addressed by solving the stochastic equation. The formulae were verified by measured data from the Yellow and Yangtze Rivers, and the results showed that the measured data agreed well with proposed formulae. This study has theoretical significance and practical value for determining bed load graduation of sandy bed in alluvial river.
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