Velocity distribution can be expressed by a logarithmicformula for the inner zone and a parabolic formula for outer and surface zones.
底部内区流速分布可用对数公式表示；外区和表面区可用二次抛物线公式表示。
2
However, under the different conditions of flow and boundary, exponent values in the exponential formula and related parameters in the logarithmicformula are different.
然而，在不同水流与边界条件下，其指数公式中的指数大小与对数公式中的有关参数有所不同。
3
It was found that in double logarithmic coordinates, the relationship of formation factor and porosity is a second order function and no longer the linear formula proposed by Archie in 1940's.