长江中下游阻力估算公式的选择

本文应用恩格隆、刘建民、王士强及乐培九的阻力公式,对长江中下游宜昌至大通河段1955～1959年测验的540组资料进行了对比计算,结果表明,当希尔兹数θ≥1.7时,乐式最优;当θ<1.7时,恩式最优。

Selection of Formulas of the Resistance for Middle and Lower Yangtze River

In this paper, Engelund's, Liu Jianmin's, Wang Shiqiang's and Yue Peijiu' s formulas for resistance are compared by using 540 sets of field data of the middle and lower Yangtze River from Yichang to Datong in 1955—1959. The Results show that it is perfect to use Yue's formula when Shields number θ≥1.7, and to use Engelund's formula when θ<1.7.