Only Einsteinformula performs well if all formulae are used with their own representative diameter.
当采用各自定义的代表粒径时，只有爱因斯坦公式能适用。
2
When the flow intensity is high, the transport rate of bed load as given by Einsteinformula might be too small.
在水流很强时，爱因斯坦公式所给出的推移质输沙率有可能偏小。
3
When the Einstein logarithmic resistance formula is used to calculate the resistance of sidewall and bed flow respectively, the closure problem of equation group can be solved.