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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。
Passing quality gradation is an important condition for the calculation and simulation of bed sediment transport and sediment transport. Based on the analysis of the critical sediment movement in the near-wall turbulent source region of the sandy river bed, the critical moving conditions of the pumped sediment are obtained by using the instantaneous momentum-collision principle. Based on the Gaussian distribution law of the vertical instantaneous turbulent velocity , Solving the stochastic equation, established a theoretical formula for calculating graded bed grading of sand bed. The test results of the measured data of the Yellow River and the Yangtze River show that the formula proposed in this paper can be consistent with the measured data of natural bed sediment transport in the natural riverbed and therefore have important theoretical and practical values for determining the sediment grading of the impacted sediment in the alluvial river bed.