长江宜昌站沙质推移质输沙规律

现有几家起动公式中的K值不能够准确预测长江宜昌站沙质推移质输沙规律。对宜昌站1956年到1964年和1973年到1974年11年的246组沙质推移质实测水力、泥沙因子资料进行统计分析，将沙质泥沙近似作为均匀沙处理，从均匀沙的起动特点出发，通过分析泥沙颗粒受力和起动模式推导得出宜昌站沙质推移质起动公式，并且公式中的K值随着流量的变化而变化，呈指数分布。在此基础上进而建立了适合宜昌站沙质推移质输沙率公式，并用宜昌站1975年沙质推移质资料对公式进行验证，按公式计算的起动流速和输沙率与实测值比较，获得满意结果。

Sand Bed-load Transport Rate at Yichang Station of Yangtze River

Some formulas now insue cannot correctly predict sediment transport rate at Yichang Station of Yangtze River. This paper statistically analyzed 246 sets of the observed data from 1959 to 1964 and 1973 to 1974 at Yichang station, and regarded sand bed-load as uniform sand. Based on the analysis of the forces acting on the grain particle and sediment rolling incipient model, the calculation formula for incipient velocity of sand bed-load was established. The coefficient K in the formula varies with the discharge and follows the exponential distribution. In the meantime, the formulas of sand bed load transport rate were established. The formulas were verified by the observed data of Yichang station in 1975. Calculated values according to the formulas were in good agreement with the observed data.