Abstract
When the sands and gravells go down one by one in waving water, their plane scattering differ from that in quiescent water. The author knew that their variance was about 10-30% larger than that in quiescent water and the mean dropping points fell from the expected point to the coming side of waves. And in order to reduce their variance, the tying up the stone are effective in waving water, too.Furthermore, he suggested that the plane scattering of the group falling in quiescent water was expressed the superposition of the Compound Poisson's distribution, and by its aid, he could get the expectation and the variance of the group falling.
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