ON THE ACCURACY OF THE CALCULATING FORMULAS FOR THE VERTICAL MEAN VELOCITY

Abstract

The author, at first, theoretically argues about the accuracy of the calculating formulas for the vertical mean velocity, connecting them with the various theories with respect to the vertical velocity distribution in an open channel. Then, applying those formulas to the data obtained in the River Tone, he concludes that it is desirable to adopt the two-point method or the three-point new one, which is introduced by the mean value theorem, in the ordinary condition, and the four-point new method at the place where the flow is exceedingly turbulented. Among the formulas having prevailed up to this time, the three-point method and the four-point one except the two-point one are not valuable at all.