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本文通过对泥沙颗粒在水中的受力情况分析，从理论上导出了描述推移质运动的数学表达式．在此基础上，又导得了挟沙水流的底部含沙量，从而使泥沙运动的扩散方程能够方便地运用到工程实际问题之中．
Based on the analysis of the force of sediment particles in water, this paper theoretically deduces the mathematical expression describing pluton movement. On this basis, it also leads to the sediment concentration at the bottom of sediment-laden flow, so that the diffusion equation of sediment movement can be conveniently applied to the practical engineering problems.